diff --git a/.gitignore b/.gitignore
index 32c6a888b..3275ff833 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 #gradle artifacts
 .gradle/
+
 **/build/*
 !**/avro-fastserde-tests111/build/codegen
 
diff --git a/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastDatumReaderTest.java b/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastDatumReaderTest.java
index bcd627a65..171054293 100644
--- a/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastDatumReaderTest.java
+++ b/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastDatumReaderTest.java
@@ -1,8 +1,14 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestRecord;
 import java.io.IOException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericData;
@@ -81,7 +87,7 @@ public void shouldNotCreateSpecificDatumReader() throws IOException, Interrupted
         (FastDeserializer<TestRecord>) cache.getFastSpecificDeserializer(TestRecord.SCHEMA$, faultySchema);
 
     Assert.assertNotNull(fastSpecificDeserializer);
-    Assert.assertEquals(fastSpecificDeserializer.getClass().getDeclaredMethods().length, 1);
+    Assert.assertFalse(fastSpecificDeserializer.isBackedByGeneratedClass());
   }
 
   @Test(groups = {"deserializationTest"})
@@ -134,4 +140,60 @@ public void shouldCreateGenericDatumReader() throws IOException {
     Assert.assertTrue(fastGenericDatumReader.isFastDeserializerUsed(), "FastGenericDatumReader should be using"
         + " Fast Deserializer when the fast deserializer generation is done.");
   }
+
+  @Test(groups = {"deserializationTest"})
+  public void testDatumReaderWithCustomization() throws IOException, ExecutionException, InterruptedException {
+    Schema recordSchema = createRecord("TestSchema",
+        createField("testInt", Schema.create(Schema.Type.INT)),
+        createMapFieldSchema("testMap", Schema.create(Schema.Type.STRING)));
+    /**
+     * Test with special map type: {@link java.util.concurrent.ConcurrentHashMap}.
+     */
+    DatumReaderCustomization customization = new DatumReaderCustomization.Builder()
+        .setNewMapOverrideFunc( (reuse, size) -> {
+          if (reuse instanceof ConcurrentHashMap) {
+            ((ConcurrentHashMap)reuse).clear();
+            return reuse;
+          } else {
+            return new ConcurrentHashMap<>(size);
+          }
+        })
+        .build();
+    // Check cold datum Reader
+    GenericRecord record = new GenericData.Record(recordSchema);
+    record.put("testInt", new Integer(100));
+    Map<Utf8, Utf8> testMap = new HashMap<>();
+    testMap.put(new Utf8("key1"), new Utf8("value1"));
+    testMap.put(new Utf8("key2"), new Utf8("value2"));
+    record.put("testMap", testMap);
+    FastGenericDatumReader<GenericRecord> fastGenericDatumReader = new FastGenericDatumReader<>(recordSchema, recordSchema, cache, null, customization);
+    GenericRecord deserializedRecordByColdDatumReader = fastGenericDatumReader.read(null, FastSerdeTestsSupport.genericDataAsDecoder(record));
+    Assert.assertEquals(deserializedRecordByColdDatumReader.get("testInt"), new Integer(100));
+    Assert.assertEquals(deserializedRecordByColdDatumReader.get("testMap"), testMap);
+    Assert.assertTrue(deserializedRecordByColdDatumReader.get("testMap") instanceof ConcurrentHashMap);
+
+    // Block the fast deserializer generation
+    fastGenericDatumReader.getFastDeserializer().get();
+    // Decode the record by fast datum reader
+    GenericRecord deserializedRecordByFastDatumReader = fastGenericDatumReader.read(null, FastSerdeTestsSupport.genericDataAsDecoder(record));
+    Assert.assertEquals(deserializedRecordByFastDatumReader.get("testInt"), new Integer(100));
+    Assert.assertEquals(deserializedRecordByFastDatumReader.get("testMap"), testMap);
+    Assert.assertTrue(deserializedRecordByFastDatumReader.get("testMap") instanceof ConcurrentHashMap);
+
+    // Test with an empty map
+    GenericRecord recordWithEmptyMap = new GenericData.Record(recordSchema);
+    recordWithEmptyMap.put("testInt", new Integer(200));
+    recordWithEmptyMap.put("testMap", Collections.emptyMap());
+    GenericRecord deserializedRecordWithEmptyMapByFastDatumReader = fastGenericDatumReader.read(null, FastSerdeTestsSupport.genericDataAsDecoder(recordWithEmptyMap));
+    Assert.assertEquals(deserializedRecordWithEmptyMapByFastDatumReader.get("testInt"), new Integer(200));
+    Assert.assertEquals(deserializedRecordWithEmptyMapByFastDatumReader.get("testMap"), Collections.emptyMap());
+    Assert.assertTrue(deserializedRecordWithEmptyMapByFastDatumReader.get("testMap") instanceof ConcurrentHashMap);
+
+    // Generate a new fast datum reader with the same schema, but without customization
+    FastGenericDatumReader<GenericRecord> fastGenericDatumReaderWithoutCustomization = new FastGenericDatumReader<>(recordSchema, cache);
+    GenericRecord deserializedRecordByFastDatumReaderWithoutCustomization = fastGenericDatumReaderWithoutCustomization.read(null, FastSerdeTestsSupport.genericDataAsDecoder(record));
+    Assert.assertEquals(deserializedRecordByFastDatumReaderWithoutCustomization.get("testInt"), new Integer(100));
+    Assert.assertEquals(deserializedRecordByFastDatumReaderWithoutCustomization.get("testMap"), testMap);
+    Assert.assertFalse(deserializedRecordByFastDatumReaderWithoutCustomization.get("testMap") instanceof ConcurrentHashMap);
+  }
 }
diff --git a/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastDatumWriterTest.java b/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastDatumWriterTest.java
index b9a2f60b7..d4e8973b2 100644
--- a/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastDatumWriterTest.java
+++ b/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastDatumWriterTest.java
@@ -1,13 +1,18 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestRecord;
 import com.linkedin.avroutil1.compatibility.AvroCompatibilityHelper;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericData;
 import org.apache.avro.generic.GenericRecord;
+import org.apache.avro.util.Utf8;
 import org.testng.Assert;
 import org.testng.annotations.BeforeTest;
 import org.testng.annotations.Test;
@@ -80,4 +85,40 @@ public void shouldCreateGenericDatumWriter() throws IOException {
     Assert.assertTrue(fastGenericDatumWriter.isFastSerializerUsed(), "FastGenericDatumWriter should be using"
         + " Fast Serializer when the fast deserializer generation is done.");
   }
+
+  @Test(groups = {"serializationTest"})
+  @SuppressWarnings("unchecked")
+  public void writeWithCustomizationCheck() throws IOException {
+    Schema recordSchema = createRecord("TestSchema",
+        createField("testInt", Schema.create(Schema.Type.INT)),
+        createMapFieldSchema("testMap", Schema.create(Schema.Type.STRING)));
+    /**
+     * Check whether the map type is a {@link java.util.LinkedHashMap} or not.
+     */
+    DatumWriterCustomization customization = new DatumWriterCustomization.Builder()
+        .setCheckMapTypeFunction( o -> {
+          if (o == null) {
+            return;
+          }
+          if (! (o instanceof LinkedHashMap)) {
+            throw new IllegalArgumentException("The map type should be 'LinkedHashMap'");
+          }
+        }).build();
+    // Check cold datum Writer
+    GenericRecord record = new GenericData.Record(recordSchema);
+    record.put("testInt", new Integer(100));
+    Map<Utf8, Utf8> testMap = new HashMap<>();
+    testMap.put(new Utf8("key1"), new Utf8("value1"));
+    testMap.put(new Utf8("key2"), new Utf8("value2"));
+    record.put("testMap", testMap);
+    FastGenericDatumWriter<GenericRecord> fastGenericDatumWriterWithoutCustomization = new FastGenericDatumWriter<>(recordSchema, null, cache, null);
+    // No exception
+    fastGenericDatumWriterWithoutCustomization.write(record, AvroCompatibilityHelper.newBinaryEncoder(new ByteArrayOutputStream(), true, null));
+
+    FastGenericDatumWriter<GenericRecord> fastGenericDatumWriterWithCustomization = new FastGenericDatumWriter<>(recordSchema, null, cache, customization);
+    Assert.expectThrows(IllegalArgumentException.class,
+        () -> fastGenericDatumWriterWithCustomization.write(record, AvroCompatibilityHelper.newBinaryEncoder(new ByteArrayOutputStream(), true, null)));
+
+
+  }
 }
diff --git a/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastGenericDeserializerGeneratorTest.java b/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastGenericDeserializerGeneratorTest.java
index c1f5e7d8c..6c2194254 100644
--- a/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastGenericDeserializerGeneratorTest.java
+++ b/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/FastGenericDeserializerGeneratorTest.java
@@ -1592,7 +1592,7 @@ record = new GenericData.Record(recordWithUnionMapOfUnionValuesSchema);
 
   private static <T> T decodeRecordColdFast(Schema writerSchema, Schema readerSchema, Decoder decoder) {
     FastDeserializer<T> deserializer =
-        new FastSerdeCache.FastDeserializerWithAvroGenericImpl<>(writerSchema, readerSchema, GenericData.get());
+        new FastSerdeUtils.FastDeserializerWithAvroGenericImpl<>(writerSchema, readerSchema, GenericData.get(), false);
 
     return decodeRecordFast(deserializer, decoder);
   }
diff --git a/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/logical/types/LogicalTypesTestBase.java b/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/logical/types/LogicalTypesTestBase.java
index 2e156ae48..86d3cce70 100644
--- a/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/logical/types/LogicalTypesTestBase.java
+++ b/fastserde/avro-fastserde-tests-common/src/test/java/com/linkedin/avro/fastserde/logical/types/LogicalTypesTestBase.java
@@ -2,6 +2,7 @@
 
 import static com.linkedin.avro.fastserde.FastSerdeTestsSupport.getCodeGenDirectory;
 
+import com.linkedin.avro.fastserde.FastSerdeUtils;
 import java.io.File;
 import java.io.IOException;
 import java.net.URL;
@@ -136,11 +137,11 @@ protected <T extends SpecificRecordBase> byte[] verifySerializers(T data,
                 schema, classesDir, classLoader, null, specificData)
                 .generateSerializer();
 
-        FastSerdeCache.FastSerializerWithAvroGenericImpl<T> fastSerializerWithAvroGeneric =
-                new FastSerdeCache.FastSerializerWithAvroGenericImpl<>(schema, genericData);
+        FastSerdeUtils.FastSerializerWithAvroGenericImpl<T> fastSerializerWithAvroGeneric =
+                new FastSerdeUtils.FastSerializerWithAvroGenericImpl<>(schema, genericData, null, false);
 
-        FastSerdeCache.FastSerializerWithAvroSpecificImpl<T> fastSerializerWithAvroSpecific =
-                new FastSerdeCache.FastSerializerWithAvroSpecificImpl<>(schema, specificData);
+        FastSerdeUtils.FastSerializerWithAvroSpecificImpl<T> fastSerializerWithAvroSpecific =
+                new FastSerdeUtils.FastSerializerWithAvroSpecificImpl<>(schema, specificData, null, false);
 
         GenericDatumWriter<T> genericDatumWriter = new GenericDatumWriter<>(
                 schema, genericData);
@@ -188,11 +189,11 @@ protected <T extends SpecificRecordBase> T verifyDeserializers(byte[] bytesWithH
                 schema, schema, classesDir, classLoader, null, specificData)
                 .generateDeserializer();
 
-        FastSerdeCache.FastDeserializerWithAvroGenericImpl<GenericData.Record> fastDeserializerWithAvroGeneric =
-                new FastSerdeCache.FastDeserializerWithAvroGenericImpl<>(schema, schema, genericData);
+        FastSerdeUtils.FastDeserializerWithAvroGenericImpl<GenericData.Record> fastDeserializerWithAvroGeneric =
+                new FastSerdeUtils.FastDeserializerWithAvroGenericImpl<>(schema, schema, genericData, false);
 
-        FastSerdeCache.FastDeserializerWithAvroSpecificImpl<T> fastDeserializerWithAvroSpecific =
-                new FastSerdeCache.FastDeserializerWithAvroSpecificImpl<>(schema, schema, specificData);
+        FastSerdeUtils.FastDeserializerWithAvroSpecificImpl<T> fastDeserializerWithAvroSpecific =
+                new FastSerdeUtils.FastDeserializerWithAvroSpecificImpl<>(schema, schema, specificData, false);
 
         GenericDatumReader<GenericData.Record> genericDatumReader = new GenericDatumReader<>(schema, schema, genericData);
 
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_BOOLEAN_GenericDeserializer_869749973_869749973.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_BOOLEAN_GenericDeserializer_869749973_869749973.java
index fc97e588d..b572071e2 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_BOOLEAN_GenericDeserializer_869749973_869749973.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_BOOLEAN_GenericDeserializer_869749973_869749973.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import com.linkedin.avro.api.PrimitiveBooleanList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveBooleanArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.io.Decoder;
@@ -19,7 +20,7 @@ public Array_of_BOOLEAN_GenericDeserializer_869749973_869749973(Schema readerSch
         this.readerSchema = readerSchema;
     }
 
-    public List<Boolean> deserialize(List<Boolean> reuse, Decoder decoder)
+    public List<Boolean> deserialize(List<Boolean> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         PrimitiveBooleanList array0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_DOUBLE_GenericDeserializer_18760307_18760307.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_DOUBLE_GenericDeserializer_18760307_18760307.java
index 6b6aa1b22..63c79e93b 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_DOUBLE_GenericDeserializer_18760307_18760307.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_DOUBLE_GenericDeserializer_18760307_18760307.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import com.linkedin.avro.api.PrimitiveDoubleList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveDoubleArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.io.Decoder;
@@ -19,7 +20,7 @@ public Array_of_DOUBLE_GenericDeserializer_18760307_18760307(Schema readerSchema
         this.readerSchema = readerSchema;
     }
 
-    public List<Double> deserialize(List<Double> reuse, Decoder decoder)
+    public List<Double> deserialize(List<Double> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         PrimitiveDoubleList array0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_FLOAT_GenericDeserializer_1012670397_1012670397.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_FLOAT_GenericDeserializer_1012670397_1012670397.java
index ac047edbc..698f11337 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_FLOAT_GenericDeserializer_1012670397_1012670397.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_FLOAT_GenericDeserializer_1012670397_1012670397.java
@@ -6,6 +6,7 @@
 import com.linkedin.avro.api.PrimitiveFloatList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.io.Decoder;
 
@@ -19,7 +20,7 @@ public Array_of_FLOAT_GenericDeserializer_1012670397_1012670397(Schema readerSch
         this.readerSchema = readerSchema;
     }
 
-    public List<Float> deserialize(List<Float> reuse, Decoder decoder)
+    public List<Float> deserialize(List<Float> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         PrimitiveFloatList array0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_INT_GenericDeserializer_1012089072_1012089072.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_INT_GenericDeserializer_1012089072_1012089072.java
index 89a26b958..56adc1d10 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_INT_GenericDeserializer_1012089072_1012089072.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_INT_GenericDeserializer_1012089072_1012089072.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.io.Decoder;
@@ -19,7 +20,7 @@ public Array_of_INT_GenericDeserializer_1012089072_1012089072(Schema readerSchem
         this.readerSchema = readerSchema;
     }
 
-    public List<Integer> deserialize(List<Integer> reuse, Decoder decoder)
+    public List<Integer> deserialize(List<Integer> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         PrimitiveIntList array0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_LONG_GenericDeserializer_325099267_325099267.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_LONG_GenericDeserializer_325099267_325099267.java
index 957af2dac..4af922766 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_LONG_GenericDeserializer_325099267_325099267.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_LONG_GenericDeserializer_325099267_325099267.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import com.linkedin.avro.api.PrimitiveLongList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveLongArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.io.Decoder;
@@ -19,7 +20,7 @@ public Array_of_LONG_GenericDeserializer_325099267_325099267(Schema readerSchema
         this.readerSchema = readerSchema;
     }
 
-    public List<Long> deserialize(List<Long> reuse, Decoder decoder)
+    public List<Long> deserialize(List<Long> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         PrimitiveLongList array0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_TestRecord_SpecificDeserializer_1088113243_1088113243.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_TestRecord_SpecificDeserializer_1088113243_1088113243.java
index 2fa4d28d7..bd9ab35ce 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_TestRecord_SpecificDeserializer_1088113243_1088113243.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_TestRecord_SpecificDeserializer_1088113243_1088113243.java
@@ -4,7 +4,6 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.api.PrimitiveBooleanList;
@@ -14,6 +13,7 @@
 import com.linkedin.avro.api.PrimitiveLongList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestFixed;
 import com.linkedin.avro.fastserde.primitive.PrimitiveBooleanArrayList;
@@ -37,7 +37,7 @@ public Array_of_TestRecord_SpecificDeserializer_1088113243_1088113243(Schema rea
         this.readerSchema = readerSchema;
     }
 
-    public List<com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(List<com.linkedin.avro.fastserde.generated.avro.TestRecord> reuse, Decoder decoder)
+    public List<com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(List<com.linkedin.avro.fastserde.generated.avro.TestRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         List<com.linkedin.avro.fastserde.generated.avro.TestRecord> array0 = null;
@@ -58,14 +58,14 @@ public List<com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(L
                 if ((reuse) instanceof GenericArray) {
                     arrayArrayElementReuseVar0 = ((GenericArray)(reuse)).peek();
                 }
-                array0 .add(deserializeTestRecord0(arrayArrayElementReuseVar0, (decoder)));
+                array0 .add(deserializeTestRecord0(arrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen0 = (decoder.arrayNext());
         }
         return array0;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord;
@@ -75,29 +75,29 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
             TestRecord = new com.linkedin.avro.fastserde.generated.avro.TestRecord();
         }
         TestRecord.put(0, (decoder.readInt()));
-        populate_TestRecord0((TestRecord), (decoder));
-        populate_TestRecord1((TestRecord), (decoder));
-        populate_TestRecord2((TestRecord), (decoder));
-        populate_TestRecord3((TestRecord), (decoder));
-        populate_TestRecord4((TestRecord), (decoder));
-        populate_TestRecord5((TestRecord), (decoder));
-        populate_TestRecord6((TestRecord), (decoder));
-        populate_TestRecord7((TestRecord), (decoder));
-        populate_TestRecord8((TestRecord), (decoder));
-        populate_TestRecord9((TestRecord), (decoder));
-        populate_TestRecord10((TestRecord), (decoder));
-        populate_TestRecord11((TestRecord), (decoder));
-        populate_TestRecord12((TestRecord), (decoder));
-        populate_TestRecord13((TestRecord), (decoder));
-        populate_TestRecord14((TestRecord), (decoder));
-        populate_TestRecord15((TestRecord), (decoder));
-        populate_TestRecord16((TestRecord), (decoder));
-        populate_TestRecord17((TestRecord), (decoder));
-        populate_TestRecord18((TestRecord), (decoder));
+        populate_TestRecord0((TestRecord), (customization), (decoder));
+        populate_TestRecord1((TestRecord), (customization), (decoder));
+        populate_TestRecord2((TestRecord), (customization), (decoder));
+        populate_TestRecord3((TestRecord), (customization), (decoder));
+        populate_TestRecord4((TestRecord), (customization), (decoder));
+        populate_TestRecord5((TestRecord), (customization), (decoder));
+        populate_TestRecord6((TestRecord), (customization), (decoder));
+        populate_TestRecord7((TestRecord), (customization), (decoder));
+        populate_TestRecord8((TestRecord), (customization), (decoder));
+        populate_TestRecord9((TestRecord), (customization), (decoder));
+        populate_TestRecord10((TestRecord), (customization), (decoder));
+        populate_TestRecord11((TestRecord), (customization), (decoder));
+        populate_TestRecord12((TestRecord), (customization), (decoder));
+        populate_TestRecord13((TestRecord), (customization), (decoder));
+        populate_TestRecord14((TestRecord), (customization), (decoder));
+        populate_TestRecord15((TestRecord), (customization), (decoder));
+        populate_TestRecord16((TestRecord), (customization), (decoder));
+        populate_TestRecord17((TestRecord), (customization), (decoder));
+        populate_TestRecord18((TestRecord), (customization), (decoder));
         return TestRecord;
     }
 
-    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -114,7 +114,7 @@ private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(2, (decoder.readLong()));
     }
 
-    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -131,7 +131,7 @@ private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(4, (decoder.readDouble()));
     }
 
-    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -148,7 +148,7 @@ private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(6, (decoder.readFloat()));
     }
 
-    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -165,7 +165,7 @@ private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(8, (decoder.readBoolean()));
     }
 
-    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -189,7 +189,7 @@ private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(10, byteBuffer0);
     }
 
-    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -220,7 +220,7 @@ private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(12, charSequence0);
     }
 
-    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
@@ -254,7 +254,7 @@ private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(14, testFixed1);
     }
 
-    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex7 = (decoder.readIndex());
@@ -314,7 +314,7 @@ private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(16, testFixedArray0);
     }
 
-    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericFixed> testFixedUnionArray0 = null;
@@ -364,7 +364,7 @@ private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(18, Enums.getConstant(TestEnum.class, (decoder.readEnum())));
     }
 
-    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex9 = (decoder.readIndex());
@@ -400,7 +400,7 @@ private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(20, testEnumArray0);
     }
 
-    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<TestEnum> testEnumUnionArray0 = null;
@@ -443,14 +443,14 @@ private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(22, null);
         } else {
             if (unionIndex11 == 1) {
-                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder)));
+                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecordUnion': "+ unionIndex11));
             }
         }
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord;
@@ -477,11 +477,11 @@ public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord
                 throw new RuntimeException(("Illegal union index for 'subField': "+ unionIndex12));
             }
         }
-        populate_SubRecord0((SubRecord), (decoder));
+        populate_SubRecord0((SubRecord), (customization), (decoder));
         return SubRecord;
     }
 
-    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, Decoder decoder)
+    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex13 = (decoder.readIndex());
@@ -504,10 +504,10 @@ private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubR
         }
     }
 
-    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder)));
+        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder), (customization)));
         List<com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArray0 = null;
         long chunkLen5 = (decoder.readArrayStart());
         Object oldArray4 = TestRecord.get(24);
@@ -527,39 +527,29 @@ private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.Te
                 if (oldArray4 instanceof GenericArray) {
                     recordsArrayArrayElementReuseVar0 = ((GenericArray) oldArray4).peek();
                 }
-                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder)));
+                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen5 = (decoder.arrayNext());
         }
         TestRecord.put(24, recordsArray0);
     }
 
-    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMap0 = null;
         long chunkLen6 = (decoder.readMapStart());
         if (chunkLen6 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapReuse0 = null;
-            Object oldMap0 = TestRecord.get(25);
-            if (oldMap0 instanceof Map) {
-                recordsMapReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapReuse0 != (null)) {
-                recordsMapReuse0 .clear();
-                recordsMap0 = recordsMapReuse0;
-            } else {
-                recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen6 * 4)+ 2)/ 3)));
-            }
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), ((int) chunkLen6)));
             do {
                 for (int counter6 = 0; (counter6 <chunkLen6); counter6 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder)));
+                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen6 = (decoder.mapNext());
             } while (chunkLen6 > 0);
         } else {
-            recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), 0));
         }
         TestRecord.put(25, recordsMap0);
         int unionIndex14 = (decoder.readIndex());
@@ -593,7 +583,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
                             recordsArrayUnionOption0 .add(null);
                         } else {
                             if (unionIndex15 == 1) {
-                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder)));
+                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder), (customization)));
                             } else {
                                 throw new RuntimeException(("Illegal union index for 'recordsArrayUnionOptionElem': "+ unionIndex15));
                             }
@@ -608,7 +598,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex16 = (decoder.readIndex());
@@ -620,17 +610,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOption0 = null;
                 long chunkLen8 = (decoder.readMapStart());
                 if (chunkLen8 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOptionReuse0 = null;
-                    Object oldMap1 = TestRecord.get(27);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapUnionOptionReuse0 != (null)) {
-                        recordsMapUnionOptionReuse0 .clear();
-                        recordsMapUnionOption0 = recordsMapUnionOptionReuse0;
-                    } else {
-                        recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen8 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), ((int) chunkLen8)));
                     do {
                         for (int counter8 = 0; (counter8 <chunkLen8); counter8 ++) {
                             Utf8 key1 = (decoder.readString(null));
@@ -640,7 +620,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapUnionOption0 .put(key1, null);
                             } else {
                                 if (unionIndex17 == 1) {
-                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder)));
+                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapUnionOptionValue': "+ unionIndex17));
                                 }
@@ -649,7 +629,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen8 = (decoder.mapNext());
                     } while (chunkLen8 > 0);
                 } else {
-                    recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), 0));
                 }
                 TestRecord.put(27, recordsMapUnionOption0);
             } else {
@@ -678,16 +658,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElem0 = null;
                 long chunkLen10 = (decoder.readMapStart());
                 if (chunkLen10 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElemReuse0 = null;
-                    if (recordsArrayMapArrayElementReuseVar0 instanceof Map) {
-                        recordsArrayMapElemReuse0 = ((Map) recordsArrayMapArrayElementReuseVar0);
-                    }
-                    if (recordsArrayMapElemReuse0 != (null)) {
-                        recordsArrayMapElemReuse0 .clear();
-                        recordsArrayMapElem0 = recordsArrayMapElemReuse0;
-                    } else {
-                        recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen10 * 4)+ 2)/ 3)));
-                    }
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, ((int) chunkLen10)));
                     do {
                         for (int counter10 = 0; (counter10 <chunkLen10); counter10 ++) {
                             Utf8 key2 = (decoder.readString(null));
@@ -697,7 +668,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsArrayMapElem0 .put(key2, null);
                             } else {
                                 if (unionIndex18 == 1) {
-                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder)));
+                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsArrayMapElemValue': "+ unionIndex18));
                                 }
@@ -706,7 +677,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen10 = (decoder.mapNext());
                     } while (chunkLen10 > 0);
                 } else {
-                    recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, 0));
                 }
                 recordsArrayMap0 .add(recordsArrayMapElem0);
             }
@@ -715,23 +686,13 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(28, recordsArrayMap0);
     }
 
-    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArray0 = null;
         long chunkLen11 = (decoder.readMapStart());
         if (chunkLen11 > 0) {
-            Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayReuse0 = null;
-            Object oldMap2 = TestRecord.get(29);
-            if (oldMap2 instanceof Map) {
-                recordsMapArrayReuse0 = ((Map) oldMap2);
-            }
-            if (recordsMapArrayReuse0 != (null)) {
-                recordsMapArrayReuse0 .clear();
-                recordsMapArray0 = recordsMapArrayReuse0;
-            } else {
-                recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen11 * 4)+ 2)/ 3)));
-            }
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), ((int) chunkLen11)));
             do {
                 for (int counter11 = 0; (counter11 <chunkLen11); counter11 ++) {
                     Utf8 key3 = (decoder.readString(null));
@@ -759,7 +720,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapArrayValue0 .add(null);
                             } else {
                                 if (unionIndex19 == 1) {
-                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder)));
+                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapArrayValueElem': "+ unionIndex19));
                                 }
@@ -772,7 +733,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 chunkLen11 = (decoder.mapNext());
             } while (chunkLen11 > 0);
         } else {
-            recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), 0));
         }
         TestRecord.put(29, recordsMapArray0);
         int unionIndex20 = (decoder.readIndex());
@@ -803,16 +764,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElem0 = null;
                         long chunkLen14 = (decoder.readMapStart());
                         if (chunkLen14 > 0) {
-                            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElemReuse0 = null;
-                            if (recordsArrayMapUnionOptionArrayElementReuseVar0 instanceof Map) {
-                                recordsArrayMapUnionOptionElemReuse0 = ((Map) recordsArrayMapUnionOptionArrayElementReuseVar0);
-                            }
-                            if (recordsArrayMapUnionOptionElemReuse0 != (null)) {
-                                recordsArrayMapUnionOptionElemReuse0 .clear();
-                                recordsArrayMapUnionOptionElem0 = recordsArrayMapUnionOptionElemReuse0;
-                            } else {
-                                recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen14 * 4)+ 2)/ 3)));
-                            }
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, ((int) chunkLen14)));
                             do {
                                 for (int counter14 = 0; (counter14 <chunkLen14); counter14 ++) {
                                     Utf8 key4 = (decoder.readString(null));
@@ -822,7 +774,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsArrayMapUnionOptionElem0 .put(key4, null);
                                     } else {
                                         if (unionIndex21 == 1) {
-                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder)));
+                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsArrayMapUnionOptionElemValue': "+ unionIndex21));
                                         }
@@ -831,7 +783,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 chunkLen14 = (decoder.mapNext());
                             } while (chunkLen14 > 0);
                         } else {
-                            recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, 0));
                         }
                         recordsArrayMapUnionOption0 .add(recordsArrayMapUnionOptionElem0);
                     }
@@ -844,7 +796,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex22 = (decoder.readIndex());
@@ -856,17 +808,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOption0 = null;
                 long chunkLen15 = (decoder.readMapStart());
                 if (chunkLen15 > 0) {
-                    Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOptionReuse0 = null;
-                    Object oldMap3 = TestRecord.get(31);
-                    if (oldMap3 instanceof Map) {
-                        recordsMapArrayUnionOptionReuse0 = ((Map) oldMap3);
-                    }
-                    if (recordsMapArrayUnionOptionReuse0 != (null)) {
-                        recordsMapArrayUnionOptionReuse0 .clear();
-                        recordsMapArrayUnionOption0 = recordsMapArrayUnionOptionReuse0;
-                    } else {
-                        recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen15 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), ((int) chunkLen15)));
                     do {
                         for (int counter15 = 0; (counter15 <chunkLen15); counter15 ++) {
                             Utf8 key5 = (decoder.readString(null));
@@ -894,7 +836,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsMapArrayUnionOptionValue0 .add(null);
                                     } else {
                                         if (unionIndex23 == 1) {
-                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder)));
+                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsMapArrayUnionOptionValueElem': "+ unionIndex23));
                                         }
@@ -907,7 +849,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen15 = (decoder.mapNext());
                     } while (chunkLen15 > 0);
                 } else {
-                    recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), 0));
                 }
                 TestRecord.put(31, recordsMapArrayUnionOption0);
             } else {
@@ -920,7 +862,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(32, null);
         } else {
             if (unionIndex24 == 1) {
-                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder)));
+                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder), (customization)));
             } else {
                 if (unionIndex24 == 2) {
                     Utf8 charSequence4;
@@ -942,7 +884,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveBooleanList booleanArray0 = null;
@@ -979,7 +921,7 @@ private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(34, doubleArray0);
     }
 
-    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveFloatList floatArray0 = null;
@@ -1003,7 +945,7 @@ private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(36, intArray0);
     }
 
-    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveLongList longArray0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_UNION_GenericDeserializer_777827233_777827233.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_UNION_GenericDeserializer_777827233_777827233.java
index b5e64128e..e045991a3 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_UNION_GenericDeserializer_777827233_777827233.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_UNION_GenericDeserializer_777827233_777827233.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -26,7 +27,7 @@ public Array_of_UNION_GenericDeserializer_777827233_777827233(Schema readerSchem
         this.field0 = arrayElemOptionSchema0 .getField("field").schema();
     }
 
-    public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decoder)
+    public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         List<IndexedRecord> array0 = null;
@@ -53,7 +54,7 @@ public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decode
                     array0 .add(null);
                 } else {
                     if (unionIndex0 == 1) {
-                        array0 .add(deserializerecord0(arrayArrayElementReuseVar0, (decoder)));
+                        array0 .add(deserializerecord0(arrayArrayElementReuseVar0, (decoder), (customization)));
                     } else {
                         throw new RuntimeException(("Illegal union index for 'arrayElem': "+ unionIndex0));
                     }
@@ -64,7 +65,7 @@ public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decode
         return array0;
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_UNION_SpecificDeserializer_1277939469_1277939469.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_UNION_SpecificDeserializer_1277939469_1277939469.java
index 24eaa7b1a..96702484a 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_UNION_SpecificDeserializer_1277939469_1277939469.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_UNION_SpecificDeserializer_1277939469_1277939469.java
@@ -4,7 +4,6 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.api.PrimitiveBooleanList;
@@ -14,6 +13,7 @@
 import com.linkedin.avro.api.PrimitiveLongList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestFixed;
 import com.linkedin.avro.fastserde.primitive.PrimitiveBooleanArrayList;
@@ -37,7 +37,7 @@ public Array_of_UNION_SpecificDeserializer_1277939469_1277939469(Schema readerSc
         this.readerSchema = readerSchema;
     }
 
-    public List<com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(List<com.linkedin.avro.fastserde.generated.avro.TestRecord> reuse, Decoder decoder)
+    public List<com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(List<com.linkedin.avro.fastserde.generated.avro.TestRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         List<com.linkedin.avro.fastserde.generated.avro.TestRecord> array0 = null;
@@ -64,7 +64,7 @@ public List<com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(L
                     array0 .add(null);
                 } else {
                     if (unionIndex0 == 1) {
-                        array0 .add(deserializeTestRecord0(arrayArrayElementReuseVar0, (decoder)));
+                        array0 .add(deserializeTestRecord0(arrayArrayElementReuseVar0, (decoder), (customization)));
                     } else {
                         throw new RuntimeException(("Illegal union index for 'arrayElem': "+ unionIndex0));
                     }
@@ -75,7 +75,7 @@ public List<com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(L
         return array0;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord;
@@ -85,29 +85,29 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
             TestRecord = new com.linkedin.avro.fastserde.generated.avro.TestRecord();
         }
         TestRecord.put(0, (decoder.readInt()));
-        populate_TestRecord0((TestRecord), (decoder));
-        populate_TestRecord1((TestRecord), (decoder));
-        populate_TestRecord2((TestRecord), (decoder));
-        populate_TestRecord3((TestRecord), (decoder));
-        populate_TestRecord4((TestRecord), (decoder));
-        populate_TestRecord5((TestRecord), (decoder));
-        populate_TestRecord6((TestRecord), (decoder));
-        populate_TestRecord7((TestRecord), (decoder));
-        populate_TestRecord8((TestRecord), (decoder));
-        populate_TestRecord9((TestRecord), (decoder));
-        populate_TestRecord10((TestRecord), (decoder));
-        populate_TestRecord11((TestRecord), (decoder));
-        populate_TestRecord12((TestRecord), (decoder));
-        populate_TestRecord13((TestRecord), (decoder));
-        populate_TestRecord14((TestRecord), (decoder));
-        populate_TestRecord15((TestRecord), (decoder));
-        populate_TestRecord16((TestRecord), (decoder));
-        populate_TestRecord17((TestRecord), (decoder));
-        populate_TestRecord18((TestRecord), (decoder));
+        populate_TestRecord0((TestRecord), (customization), (decoder));
+        populate_TestRecord1((TestRecord), (customization), (decoder));
+        populate_TestRecord2((TestRecord), (customization), (decoder));
+        populate_TestRecord3((TestRecord), (customization), (decoder));
+        populate_TestRecord4((TestRecord), (customization), (decoder));
+        populate_TestRecord5((TestRecord), (customization), (decoder));
+        populate_TestRecord6((TestRecord), (customization), (decoder));
+        populate_TestRecord7((TestRecord), (customization), (decoder));
+        populate_TestRecord8((TestRecord), (customization), (decoder));
+        populate_TestRecord9((TestRecord), (customization), (decoder));
+        populate_TestRecord10((TestRecord), (customization), (decoder));
+        populate_TestRecord11((TestRecord), (customization), (decoder));
+        populate_TestRecord12((TestRecord), (customization), (decoder));
+        populate_TestRecord13((TestRecord), (customization), (decoder));
+        populate_TestRecord14((TestRecord), (customization), (decoder));
+        populate_TestRecord15((TestRecord), (customization), (decoder));
+        populate_TestRecord16((TestRecord), (customization), (decoder));
+        populate_TestRecord17((TestRecord), (customization), (decoder));
+        populate_TestRecord18((TestRecord), (customization), (decoder));
         return TestRecord;
     }
 
-    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -124,7 +124,7 @@ private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(2, (decoder.readLong()));
     }
 
-    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -141,7 +141,7 @@ private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(4, (decoder.readDouble()));
     }
 
-    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -158,7 +158,7 @@ private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(6, (decoder.readFloat()));
     }
 
-    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -175,7 +175,7 @@ private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(8, (decoder.readBoolean()));
     }
 
-    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -199,7 +199,7 @@ private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(10, byteBuffer0);
     }
 
-    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
@@ -230,7 +230,7 @@ private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(12, charSequence0);
     }
 
-    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex7 = (decoder.readIndex());
@@ -264,7 +264,7 @@ private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(14, testFixed1);
     }
 
-    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex8 = (decoder.readIndex());
@@ -324,7 +324,7 @@ private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(16, testFixedArray0);
     }
 
-    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericFixed> testFixedUnionArray0 = null;
@@ -374,7 +374,7 @@ private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(18, Enums.getConstant(TestEnum.class, (decoder.readEnum())));
     }
 
-    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex10 = (decoder.readIndex());
@@ -410,7 +410,7 @@ private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(20, testEnumArray0);
     }
 
-    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<TestEnum> testEnumUnionArray0 = null;
@@ -453,14 +453,14 @@ private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(22, null);
         } else {
             if (unionIndex12 == 1) {
-                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder)));
+                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecordUnion': "+ unionIndex12));
             }
         }
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord;
@@ -487,11 +487,11 @@ public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord
                 throw new RuntimeException(("Illegal union index for 'subField': "+ unionIndex13));
             }
         }
-        populate_SubRecord0((SubRecord), (decoder));
+        populate_SubRecord0((SubRecord), (customization), (decoder));
         return SubRecord;
     }
 
-    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, Decoder decoder)
+    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex14 = (decoder.readIndex());
@@ -514,10 +514,10 @@ private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubR
         }
     }
 
-    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder)));
+        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder), (customization)));
         List<com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArray0 = null;
         long chunkLen5 = (decoder.readArrayStart());
         Object oldArray4 = TestRecord.get(24);
@@ -537,39 +537,29 @@ private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.Te
                 if (oldArray4 instanceof GenericArray) {
                     recordsArrayArrayElementReuseVar0 = ((GenericArray) oldArray4).peek();
                 }
-                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder)));
+                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen5 = (decoder.arrayNext());
         }
         TestRecord.put(24, recordsArray0);
     }
 
-    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMap0 = null;
         long chunkLen6 = (decoder.readMapStart());
         if (chunkLen6 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapReuse0 = null;
-            Object oldMap0 = TestRecord.get(25);
-            if (oldMap0 instanceof Map) {
-                recordsMapReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapReuse0 != (null)) {
-                recordsMapReuse0 .clear();
-                recordsMap0 = recordsMapReuse0;
-            } else {
-                recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen6 * 4)+ 2)/ 3)));
-            }
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), ((int) chunkLen6)));
             do {
                 for (int counter6 = 0; (counter6 <chunkLen6); counter6 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder)));
+                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen6 = (decoder.mapNext());
             } while (chunkLen6 > 0);
         } else {
-            recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), 0));
         }
         TestRecord.put(25, recordsMap0);
         int unionIndex15 = (decoder.readIndex());
@@ -603,7 +593,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
                             recordsArrayUnionOption0 .add(null);
                         } else {
                             if (unionIndex16 == 1) {
-                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder)));
+                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder), (customization)));
                             } else {
                                 throw new RuntimeException(("Illegal union index for 'recordsArrayUnionOptionElem': "+ unionIndex16));
                             }
@@ -618,7 +608,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex17 = (decoder.readIndex());
@@ -630,17 +620,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOption0 = null;
                 long chunkLen8 = (decoder.readMapStart());
                 if (chunkLen8 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOptionReuse0 = null;
-                    Object oldMap1 = TestRecord.get(27);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapUnionOptionReuse0 != (null)) {
-                        recordsMapUnionOptionReuse0 .clear();
-                        recordsMapUnionOption0 = recordsMapUnionOptionReuse0;
-                    } else {
-                        recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen8 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), ((int) chunkLen8)));
                     do {
                         for (int counter8 = 0; (counter8 <chunkLen8); counter8 ++) {
                             Utf8 key1 = (decoder.readString(null));
@@ -650,7 +630,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapUnionOption0 .put(key1, null);
                             } else {
                                 if (unionIndex18 == 1) {
-                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder)));
+                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapUnionOptionValue': "+ unionIndex18));
                                 }
@@ -659,7 +639,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen8 = (decoder.mapNext());
                     } while (chunkLen8 > 0);
                 } else {
-                    recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), 0));
                 }
                 TestRecord.put(27, recordsMapUnionOption0);
             } else {
@@ -688,16 +668,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElem0 = null;
                 long chunkLen10 = (decoder.readMapStart());
                 if (chunkLen10 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElemReuse0 = null;
-                    if (recordsArrayMapArrayElementReuseVar0 instanceof Map) {
-                        recordsArrayMapElemReuse0 = ((Map) recordsArrayMapArrayElementReuseVar0);
-                    }
-                    if (recordsArrayMapElemReuse0 != (null)) {
-                        recordsArrayMapElemReuse0 .clear();
-                        recordsArrayMapElem0 = recordsArrayMapElemReuse0;
-                    } else {
-                        recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen10 * 4)+ 2)/ 3)));
-                    }
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, ((int) chunkLen10)));
                     do {
                         for (int counter10 = 0; (counter10 <chunkLen10); counter10 ++) {
                             Utf8 key2 = (decoder.readString(null));
@@ -707,7 +678,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsArrayMapElem0 .put(key2, null);
                             } else {
                                 if (unionIndex19 == 1) {
-                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder)));
+                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsArrayMapElemValue': "+ unionIndex19));
                                 }
@@ -716,7 +687,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen10 = (decoder.mapNext());
                     } while (chunkLen10 > 0);
                 } else {
-                    recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, 0));
                 }
                 recordsArrayMap0 .add(recordsArrayMapElem0);
             }
@@ -725,23 +696,13 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(28, recordsArrayMap0);
     }
 
-    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArray0 = null;
         long chunkLen11 = (decoder.readMapStart());
         if (chunkLen11 > 0) {
-            Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayReuse0 = null;
-            Object oldMap2 = TestRecord.get(29);
-            if (oldMap2 instanceof Map) {
-                recordsMapArrayReuse0 = ((Map) oldMap2);
-            }
-            if (recordsMapArrayReuse0 != (null)) {
-                recordsMapArrayReuse0 .clear();
-                recordsMapArray0 = recordsMapArrayReuse0;
-            } else {
-                recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen11 * 4)+ 2)/ 3)));
-            }
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), ((int) chunkLen11)));
             do {
                 for (int counter11 = 0; (counter11 <chunkLen11); counter11 ++) {
                     Utf8 key3 = (decoder.readString(null));
@@ -769,7 +730,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapArrayValue0 .add(null);
                             } else {
                                 if (unionIndex20 == 1) {
-                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder)));
+                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapArrayValueElem': "+ unionIndex20));
                                 }
@@ -782,7 +743,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 chunkLen11 = (decoder.mapNext());
             } while (chunkLen11 > 0);
         } else {
-            recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), 0));
         }
         TestRecord.put(29, recordsMapArray0);
         int unionIndex21 = (decoder.readIndex());
@@ -813,16 +774,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElem0 = null;
                         long chunkLen14 = (decoder.readMapStart());
                         if (chunkLen14 > 0) {
-                            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElemReuse0 = null;
-                            if (recordsArrayMapUnionOptionArrayElementReuseVar0 instanceof Map) {
-                                recordsArrayMapUnionOptionElemReuse0 = ((Map) recordsArrayMapUnionOptionArrayElementReuseVar0);
-                            }
-                            if (recordsArrayMapUnionOptionElemReuse0 != (null)) {
-                                recordsArrayMapUnionOptionElemReuse0 .clear();
-                                recordsArrayMapUnionOptionElem0 = recordsArrayMapUnionOptionElemReuse0;
-                            } else {
-                                recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen14 * 4)+ 2)/ 3)));
-                            }
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, ((int) chunkLen14)));
                             do {
                                 for (int counter14 = 0; (counter14 <chunkLen14); counter14 ++) {
                                     Utf8 key4 = (decoder.readString(null));
@@ -832,7 +784,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsArrayMapUnionOptionElem0 .put(key4, null);
                                     } else {
                                         if (unionIndex22 == 1) {
-                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder)));
+                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsArrayMapUnionOptionElemValue': "+ unionIndex22));
                                         }
@@ -841,7 +793,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 chunkLen14 = (decoder.mapNext());
                             } while (chunkLen14 > 0);
                         } else {
-                            recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, 0));
                         }
                         recordsArrayMapUnionOption0 .add(recordsArrayMapUnionOptionElem0);
                     }
@@ -854,7 +806,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex23 = (decoder.readIndex());
@@ -866,17 +818,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOption0 = null;
                 long chunkLen15 = (decoder.readMapStart());
                 if (chunkLen15 > 0) {
-                    Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOptionReuse0 = null;
-                    Object oldMap3 = TestRecord.get(31);
-                    if (oldMap3 instanceof Map) {
-                        recordsMapArrayUnionOptionReuse0 = ((Map) oldMap3);
-                    }
-                    if (recordsMapArrayUnionOptionReuse0 != (null)) {
-                        recordsMapArrayUnionOptionReuse0 .clear();
-                        recordsMapArrayUnionOption0 = recordsMapArrayUnionOptionReuse0;
-                    } else {
-                        recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen15 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), ((int) chunkLen15)));
                     do {
                         for (int counter15 = 0; (counter15 <chunkLen15); counter15 ++) {
                             Utf8 key5 = (decoder.readString(null));
@@ -904,7 +846,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsMapArrayUnionOptionValue0 .add(null);
                                     } else {
                                         if (unionIndex24 == 1) {
-                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder)));
+                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsMapArrayUnionOptionValueElem': "+ unionIndex24));
                                         }
@@ -917,7 +859,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen15 = (decoder.mapNext());
                     } while (chunkLen15 > 0);
                 } else {
-                    recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), 0));
                 }
                 TestRecord.put(31, recordsMapArrayUnionOption0);
             } else {
@@ -930,7 +872,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(32, null);
         } else {
             if (unionIndex25 == 1) {
-                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder)));
+                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder), (customization)));
             } else {
                 if (unionIndex25 == 2) {
                     Utf8 charSequence4;
@@ -952,7 +894,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveBooleanList booleanArray0 = null;
@@ -989,7 +931,7 @@ private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(34, doubleArray0);
     }
 
-    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveFloatList floatArray0 = null;
@@ -1013,7 +955,7 @@ private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(36, intArray0);
     }
 
-    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveLongList longArray0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_record_GenericDeserializer_1606337179_2018567528.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_record_GenericDeserializer_1606337179_2018567528.java
index a316aef3b..1e650133f 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_record_GenericDeserializer_1606337179_2018567528.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_record_GenericDeserializer_1606337179_2018567528.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
@@ -22,7 +23,7 @@ public Array_of_record_GenericDeserializer_1606337179_2018567528(Schema readerSc
         this.unionOptionArrayElemSchema0 = readerSchema.getElementType();
     }
 
-    public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decoder)
+    public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -48,7 +49,7 @@ public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decode
                         if ((reuse) instanceof GenericArray) {
                             unionOptionArrayElementReuseVar0 = ((GenericArray)(reuse)).peek();
                         }
-                        unionOption0 .add(deserializerecord0(unionOptionArrayElementReuseVar0, (decoder)));
+                        unionOption0 .add(deserializerecord0(unionOptionArrayElementReuseVar0, (decoder), (customization)));
                     }
                     chunkLen0 = (decoder.arrayNext());
                 }
@@ -59,7 +60,7 @@ public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decode
         }
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_record_GenericDeserializer_477614132_477614132.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_record_GenericDeserializer_477614132_477614132.java
index 362a2f8fb..2fb3e2221 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_record_GenericDeserializer_477614132_477614132.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Array_of_record_GenericDeserializer_477614132_477614132.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -24,7 +25,7 @@ public Array_of_record_GenericDeserializer_477614132_477614132(Schema readerSche
         this.field0 = arrayArrayElemSchema0 .getField("field").schema();
     }
 
-    public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decoder)
+    public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         List<IndexedRecord> array0 = null;
@@ -45,14 +46,14 @@ public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decode
                 if ((reuse) instanceof GenericArray) {
                     arrayArrayElementReuseVar0 = ((GenericArray)(reuse)).peek();
                 }
-                array0 .add(deserializerecord0(arrayArrayElementReuseVar0, (decoder)));
+                array0 .add(deserializerecord0(arrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen0 = (decoder.arrayNext());
         }
         return array0;
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema_GenericDeserializer_836892732_836892732.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema_GenericDeserializer_836892732_836892732.java
index e19c97cd8..ed87c9064 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema_GenericDeserializer_836892732_836892732.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema_GenericDeserializer_836892732_836892732.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -2018,13 +2019,13 @@ public FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema_Ge
         this.f9990 = readerSchema.getField("F999").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema;
@@ -2051,510 +2052,510 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldBeAbl
                 throw new RuntimeException(("Illegal union index for 'F0': "+ unionIndex0));
             }
         }
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema0((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema1((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema2((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema3((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema4((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema5((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema6((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema7((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema8((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema9((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema10((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema11((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema12((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema13((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema14((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema15((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema16((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema17((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema18((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema19((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema20((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema21((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema22((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema23((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema24((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema25((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema26((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema27((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema28((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema29((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema30((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema31((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema32((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema33((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema34((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema35((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (decoder));
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+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema362((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema363((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema364((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema365((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema366((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema367((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema368((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema369((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema370((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema371((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema372((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema373((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema374((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema375((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema376((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema377((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema378((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema379((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema380((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema381((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema382((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema383((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema384((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema385((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema386((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema387((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema388((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema389((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema390((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema391((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema392((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema393((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema394((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema395((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema396((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema397((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema398((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema399((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema400((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema401((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema402((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema403((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema404((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema405((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema406((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema407((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema408((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema409((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema410((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema411((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema412((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema413((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema414((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema415((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema416((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema417((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema418((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema419((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema420((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema421((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema422((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema423((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema424((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema425((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema426((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema427((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema428((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema429((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema430((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema431((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema432((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema433((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema434((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema435((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema436((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema437((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema438((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema439((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema440((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema441((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema442((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema443((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema444((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema445((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema446((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema447((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema448((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema449((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema450((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema451((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema452((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema453((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema454((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema455((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema456((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema457((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema458((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema459((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema460((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema461((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema462((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema463((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema464((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema465((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema466((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema467((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema468((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema469((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema470((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema471((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema472((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema473((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema474((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema475((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema476((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema477((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema478((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema479((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema480((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema481((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema482((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema483((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema484((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema485((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema486((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema487((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema488((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema489((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema490((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema491((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema492((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema493((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema494((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema495((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema496((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema497((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema498((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema499((FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -2595,7 +2596,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -2636,7 +2637,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema2(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema2(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -2677,7 +2678,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema3(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema3(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex7 = (decoder.readIndex());
@@ -2718,7 +2719,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema4(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema4(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex9 = (decoder.readIndex());
@@ -2759,7 +2760,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema5(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema5(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex11 = (decoder.readIndex());
@@ -2800,7 +2801,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema6(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema6(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex13 = (decoder.readIndex());
@@ -2841,7 +2842,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema7(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema7(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex15 = (decoder.readIndex());
@@ -2882,7 +2883,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema8(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema8(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex17 = (decoder.readIndex());
@@ -2923,7 +2924,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema9(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema9(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex19 = (decoder.readIndex());
@@ -2964,7 +2965,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema10(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema10(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex21 = (decoder.readIndex());
@@ -3005,7 +3006,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema11(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema11(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex23 = (decoder.readIndex());
@@ -3046,7 +3047,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema12(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema12(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex25 = (decoder.readIndex());
@@ -3087,7 +3088,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema13(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema13(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex27 = (decoder.readIndex());
@@ -3128,7 +3129,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema14(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema14(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex29 = (decoder.readIndex());
@@ -3169,7 +3170,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema15(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema15(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex31 = (decoder.readIndex());
@@ -3210,7 +3211,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema16(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema16(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex33 = (decoder.readIndex());
@@ -3251,7 +3252,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema17(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema17(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex35 = (decoder.readIndex());
@@ -3292,7 +3293,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema18(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema18(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex37 = (decoder.readIndex());
@@ -3333,7 +3334,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema19(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema19(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex39 = (decoder.readIndex());
@@ -3374,7 +3375,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema20(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema20(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex41 = (decoder.readIndex());
@@ -3415,7 +3416,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema21(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema21(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex43 = (decoder.readIndex());
@@ -3456,7 +3457,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema22(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema22(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex45 = (decoder.readIndex());
@@ -3497,7 +3498,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema23(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema23(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex47 = (decoder.readIndex());
@@ -3538,7 +3539,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema24(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema24(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex49 = (decoder.readIndex());
@@ -3579,7 +3580,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema25(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema25(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex51 = (decoder.readIndex());
@@ -3620,7 +3621,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema26(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema26(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex53 = (decoder.readIndex());
@@ -3661,7 +3662,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema27(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema27(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex55 = (decoder.readIndex());
@@ -3702,7 +3703,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema28(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema28(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex57 = (decoder.readIndex());
@@ -3743,7 +3744,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema29(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema29(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex59 = (decoder.readIndex());
@@ -3784,7 +3785,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema30(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema30(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex61 = (decoder.readIndex());
@@ -3825,7 +3826,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema31(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema31(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex63 = (decoder.readIndex());
@@ -3866,7 +3867,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema32(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema32(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex65 = (decoder.readIndex());
@@ -3907,7 +3908,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema33(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema33(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex67 = (decoder.readIndex());
@@ -3948,7 +3949,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema34(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema34(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex69 = (decoder.readIndex());
@@ -3989,7 +3990,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema35(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema35(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex71 = (decoder.readIndex());
@@ -4030,7 +4031,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema36(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema36(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex73 = (decoder.readIndex());
@@ -4071,7 +4072,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema37(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema37(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex75 = (decoder.readIndex());
@@ -4112,7 +4113,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema38(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema38(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex77 = (decoder.readIndex());
@@ -4153,7 +4154,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema39(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema39(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex79 = (decoder.readIndex());
@@ -4194,7 +4195,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema40(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema40(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex81 = (decoder.readIndex());
@@ -4235,7 +4236,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema41(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema41(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex83 = (decoder.readIndex());
@@ -4276,7 +4277,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema42(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema42(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex85 = (decoder.readIndex());
@@ -4317,7 +4318,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema43(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema43(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex87 = (decoder.readIndex());
@@ -4358,7 +4359,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema44(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema44(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex89 = (decoder.readIndex());
@@ -4399,7 +4400,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema45(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema45(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex91 = (decoder.readIndex());
@@ -4440,7 +4441,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema46(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema46(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex93 = (decoder.readIndex());
@@ -4481,7 +4482,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema47(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema47(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex95 = (decoder.readIndex());
@@ -4522,7 +4523,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema48(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema48(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex97 = (decoder.readIndex());
@@ -4563,7 +4564,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema49(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema49(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex99 = (decoder.readIndex());
@@ -4604,7 +4605,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema50(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema50(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex101 = (decoder.readIndex());
@@ -4645,7 +4646,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema51(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema51(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex103 = (decoder.readIndex());
@@ -4686,7 +4687,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema52(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema52(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex105 = (decoder.readIndex());
@@ -4727,7 +4728,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema53(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema53(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex107 = (decoder.readIndex());
@@ -4768,7 +4769,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema54(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema54(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex109 = (decoder.readIndex());
@@ -4809,7 +4810,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema55(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema55(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex111 = (decoder.readIndex());
@@ -4850,7 +4851,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema56(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema56(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex113 = (decoder.readIndex());
@@ -4891,7 +4892,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema57(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema57(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex115 = (decoder.readIndex());
@@ -4932,7 +4933,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema58(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema58(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex117 = (decoder.readIndex());
@@ -4973,7 +4974,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema59(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema59(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex119 = (decoder.readIndex());
@@ -5014,7 +5015,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema60(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema60(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex121 = (decoder.readIndex());
@@ -5055,7 +5056,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema61(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema61(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex123 = (decoder.readIndex());
@@ -5096,7 +5097,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema62(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema62(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex125 = (decoder.readIndex());
@@ -5137,7 +5138,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema63(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema63(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex127 = (decoder.readIndex());
@@ -5178,7 +5179,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema64(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema64(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex129 = (decoder.readIndex());
@@ -5219,7 +5220,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema65(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema65(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex131 = (decoder.readIndex());
@@ -5260,7 +5261,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema66(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema66(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex133 = (decoder.readIndex());
@@ -5301,7 +5302,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema67(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema67(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex135 = (decoder.readIndex());
@@ -5342,7 +5343,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema68(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema68(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex137 = (decoder.readIndex());
@@ -5383,7 +5384,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema69(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema69(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex139 = (decoder.readIndex());
@@ -5424,7 +5425,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema70(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema70(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex141 = (decoder.readIndex());
@@ -5465,7 +5466,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema71(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema71(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex143 = (decoder.readIndex());
@@ -5506,7 +5507,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema72(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema72(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex145 = (decoder.readIndex());
@@ -5547,7 +5548,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema73(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema73(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex147 = (decoder.readIndex());
@@ -5588,7 +5589,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema74(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema74(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex149 = (decoder.readIndex());
@@ -5629,7 +5630,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema75(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema75(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex151 = (decoder.readIndex());
@@ -5670,7 +5671,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema76(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema76(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex153 = (decoder.readIndex());
@@ -5711,7 +5712,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema77(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema77(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex155 = (decoder.readIndex());
@@ -5752,7 +5753,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema78(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema78(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex157 = (decoder.readIndex());
@@ -5793,7 +5794,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema79(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema79(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex159 = (decoder.readIndex());
@@ -5834,7 +5835,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema80(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema80(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex161 = (decoder.readIndex());
@@ -5875,7 +5876,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema81(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema81(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex163 = (decoder.readIndex());
@@ -5916,7 +5917,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema82(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema82(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex165 = (decoder.readIndex());
@@ -5957,7 +5958,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema83(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema83(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex167 = (decoder.readIndex());
@@ -5998,7 +5999,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema84(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema84(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex169 = (decoder.readIndex());
@@ -6039,7 +6040,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema85(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema85(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex171 = (decoder.readIndex());
@@ -6080,7 +6081,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema86(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema86(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex173 = (decoder.readIndex());
@@ -6121,7 +6122,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema87(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema87(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex175 = (decoder.readIndex());
@@ -6162,7 +6163,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema88(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema88(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex177 = (decoder.readIndex());
@@ -6203,7 +6204,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema89(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema89(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex179 = (decoder.readIndex());
@@ -6244,7 +6245,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema90(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema90(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex181 = (decoder.readIndex());
@@ -6285,7 +6286,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema91(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema91(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex183 = (decoder.readIndex());
@@ -6326,7 +6327,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema92(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema92(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex185 = (decoder.readIndex());
@@ -6367,7 +6368,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema93(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema93(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex187 = (decoder.readIndex());
@@ -6408,7 +6409,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema94(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema94(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex189 = (decoder.readIndex());
@@ -6449,7 +6450,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema95(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema95(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex191 = (decoder.readIndex());
@@ -6490,7 +6491,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema96(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema96(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex193 = (decoder.readIndex());
@@ -6531,7 +6532,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema97(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema97(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex195 = (decoder.readIndex());
@@ -6572,7 +6573,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema98(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema98(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex197 = (decoder.readIndex());
@@ -6613,7 +6614,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema99(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema99(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex199 = (decoder.readIndex());
@@ -6654,7 +6655,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema100(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema100(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex201 = (decoder.readIndex());
@@ -6695,7 +6696,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema101(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema101(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex203 = (decoder.readIndex());
@@ -6736,7 +6737,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema102(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema102(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex205 = (decoder.readIndex());
@@ -6777,7 +6778,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema103(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema103(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex207 = (decoder.readIndex());
@@ -6818,7 +6819,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema104(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema104(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex209 = (decoder.readIndex());
@@ -6859,7 +6860,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema105(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema105(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex211 = (decoder.readIndex());
@@ -6900,7 +6901,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema106(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema106(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex213 = (decoder.readIndex());
@@ -6941,7 +6942,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema107(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema107(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex215 = (decoder.readIndex());
@@ -6982,7 +6983,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema108(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema108(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex217 = (decoder.readIndex());
@@ -7023,7 +7024,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema109(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema109(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex219 = (decoder.readIndex());
@@ -7064,7 +7065,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema110(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema110(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex221 = (decoder.readIndex());
@@ -7105,7 +7106,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema111(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema111(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex223 = (decoder.readIndex());
@@ -7146,7 +7147,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema112(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema112(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex225 = (decoder.readIndex());
@@ -7187,7 +7188,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema113(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema113(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex227 = (decoder.readIndex());
@@ -7228,7 +7229,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema114(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema114(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex229 = (decoder.readIndex());
@@ -7269,7 +7270,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema115(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema115(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex231 = (decoder.readIndex());
@@ -7310,7 +7311,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema116(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema116(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex233 = (decoder.readIndex());
@@ -7351,7 +7352,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema117(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema117(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex235 = (decoder.readIndex());
@@ -7392,7 +7393,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema118(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema118(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex237 = (decoder.readIndex());
@@ -7433,7 +7434,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema119(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema119(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex239 = (decoder.readIndex());
@@ -7474,7 +7475,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema120(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema120(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex241 = (decoder.readIndex());
@@ -7515,7 +7516,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema121(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema121(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex243 = (decoder.readIndex());
@@ -7556,7 +7557,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema122(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema122(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex245 = (decoder.readIndex());
@@ -7597,7 +7598,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema123(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema123(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex247 = (decoder.readIndex());
@@ -7638,7 +7639,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema124(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema124(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex249 = (decoder.readIndex());
@@ -7679,7 +7680,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema125(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema125(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex251 = (decoder.readIndex());
@@ -7720,7 +7721,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema126(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema126(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex253 = (decoder.readIndex());
@@ -7761,7 +7762,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema127(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema127(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex255 = (decoder.readIndex());
@@ -7802,7 +7803,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema128(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema128(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex257 = (decoder.readIndex());
@@ -7843,7 +7844,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema129(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema129(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex259 = (decoder.readIndex());
@@ -7884,7 +7885,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema130(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema130(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex261 = (decoder.readIndex());
@@ -7925,7 +7926,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema131(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema131(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex263 = (decoder.readIndex());
@@ -7966,7 +7967,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema132(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema132(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex265 = (decoder.readIndex());
@@ -8007,7 +8008,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema133(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema133(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex267 = (decoder.readIndex());
@@ -8048,7 +8049,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema134(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema134(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex269 = (decoder.readIndex());
@@ -8089,7 +8090,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema135(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema135(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex271 = (decoder.readIndex());
@@ -8130,7 +8131,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema136(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema136(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex273 = (decoder.readIndex());
@@ -8171,7 +8172,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema137(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema137(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex275 = (decoder.readIndex());
@@ -8212,7 +8213,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema138(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema138(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex277 = (decoder.readIndex());
@@ -8253,7 +8254,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema139(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema139(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex279 = (decoder.readIndex());
@@ -8294,7 +8295,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema140(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema140(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex281 = (decoder.readIndex());
@@ -8335,7 +8336,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema141(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema141(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex283 = (decoder.readIndex());
@@ -8376,7 +8377,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema142(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema142(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex285 = (decoder.readIndex());
@@ -8417,7 +8418,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema143(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema143(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex287 = (decoder.readIndex());
@@ -8458,7 +8459,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema144(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema144(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex289 = (decoder.readIndex());
@@ -8499,7 +8500,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema145(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema145(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex291 = (decoder.readIndex());
@@ -8540,7 +8541,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema146(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema146(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex293 = (decoder.readIndex());
@@ -8581,7 +8582,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema147(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema147(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex295 = (decoder.readIndex());
@@ -8622,7 +8623,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema148(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema148(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex297 = (decoder.readIndex());
@@ -8663,7 +8664,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema149(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema149(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex299 = (decoder.readIndex());
@@ -8704,7 +8705,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema150(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema150(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex301 = (decoder.readIndex());
@@ -8745,7 +8746,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema151(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema151(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex303 = (decoder.readIndex());
@@ -8786,7 +8787,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema152(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema152(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex305 = (decoder.readIndex());
@@ -8827,7 +8828,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema153(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema153(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex307 = (decoder.readIndex());
@@ -8868,7 +8869,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema154(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema154(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex309 = (decoder.readIndex());
@@ -8909,7 +8910,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema155(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema155(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex311 = (decoder.readIndex());
@@ -8950,7 +8951,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema156(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema156(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex313 = (decoder.readIndex());
@@ -8991,7 +8992,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema157(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema157(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex315 = (decoder.readIndex());
@@ -9032,7 +9033,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema158(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema158(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex317 = (decoder.readIndex());
@@ -9073,7 +9074,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema159(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema159(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex319 = (decoder.readIndex());
@@ -9114,7 +9115,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema160(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema160(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex321 = (decoder.readIndex());
@@ -9155,7 +9156,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema161(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema161(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex323 = (decoder.readIndex());
@@ -9196,7 +9197,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema162(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema162(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex325 = (decoder.readIndex());
@@ -9237,7 +9238,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema163(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema163(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex327 = (decoder.readIndex());
@@ -9278,7 +9279,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema164(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema164(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex329 = (decoder.readIndex());
@@ -9319,7 +9320,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema165(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema165(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex331 = (decoder.readIndex());
@@ -9360,7 +9361,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema166(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema166(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex333 = (decoder.readIndex());
@@ -9401,7 +9402,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema167(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema167(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex335 = (decoder.readIndex());
@@ -9442,7 +9443,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema168(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema168(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex337 = (decoder.readIndex());
@@ -9483,7 +9484,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema169(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema169(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex339 = (decoder.readIndex());
@@ -9524,7 +9525,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema170(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema170(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex341 = (decoder.readIndex());
@@ -9565,7 +9566,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema171(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema171(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex343 = (decoder.readIndex());
@@ -9606,7 +9607,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema172(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema172(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex345 = (decoder.readIndex());
@@ -9647,7 +9648,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema173(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema173(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex347 = (decoder.readIndex());
@@ -9688,7 +9689,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema174(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema174(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex349 = (decoder.readIndex());
@@ -9729,7 +9730,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema175(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema175(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex351 = (decoder.readIndex());
@@ -9770,7 +9771,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema176(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema176(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex353 = (decoder.readIndex());
@@ -9811,7 +9812,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema177(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema177(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex355 = (decoder.readIndex());
@@ -9852,7 +9853,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema178(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema178(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex357 = (decoder.readIndex());
@@ -9893,7 +9894,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema179(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema179(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex359 = (decoder.readIndex());
@@ -9934,7 +9935,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema180(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema180(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex361 = (decoder.readIndex());
@@ -9975,7 +9976,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema181(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema181(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex363 = (decoder.readIndex());
@@ -10016,7 +10017,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema182(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema182(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex365 = (decoder.readIndex());
@@ -10057,7 +10058,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema183(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema183(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex367 = (decoder.readIndex());
@@ -10098,7 +10099,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema184(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema184(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex369 = (decoder.readIndex());
@@ -10139,7 +10140,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema185(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema185(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex371 = (decoder.readIndex());
@@ -10180,7 +10181,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema186(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema186(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex373 = (decoder.readIndex());
@@ -10221,7 +10222,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema187(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema187(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex375 = (decoder.readIndex());
@@ -10262,7 +10263,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema188(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema188(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex377 = (decoder.readIndex());
@@ -10303,7 +10304,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema189(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema189(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex379 = (decoder.readIndex());
@@ -10344,7 +10345,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema190(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema190(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex381 = (decoder.readIndex());
@@ -10385,7 +10386,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema191(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema191(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex383 = (decoder.readIndex());
@@ -10426,7 +10427,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema192(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema192(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex385 = (decoder.readIndex());
@@ -10467,7 +10468,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema193(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema193(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex387 = (decoder.readIndex());
@@ -10508,7 +10509,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema194(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema194(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex389 = (decoder.readIndex());
@@ -10549,7 +10550,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema195(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema195(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex391 = (decoder.readIndex());
@@ -10590,7 +10591,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema196(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema196(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex393 = (decoder.readIndex());
@@ -10631,7 +10632,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema197(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema197(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex395 = (decoder.readIndex());
@@ -10672,7 +10673,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema198(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema198(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex397 = (decoder.readIndex());
@@ -10713,7 +10714,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema199(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema199(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex399 = (decoder.readIndex());
@@ -10754,7 +10755,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema200(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema200(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex401 = (decoder.readIndex());
@@ -10795,7 +10796,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema201(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema201(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex403 = (decoder.readIndex());
@@ -10836,7 +10837,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema202(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema202(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex405 = (decoder.readIndex());
@@ -10877,7 +10878,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema203(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema203(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex407 = (decoder.readIndex());
@@ -10918,7 +10919,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema204(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema204(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex409 = (decoder.readIndex());
@@ -10959,7 +10960,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema205(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema205(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex411 = (decoder.readIndex());
@@ -11000,7 +11001,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema206(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema206(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex413 = (decoder.readIndex());
@@ -11041,7 +11042,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema207(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema207(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex415 = (decoder.readIndex());
@@ -11082,7 +11083,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema208(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema208(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex417 = (decoder.readIndex());
@@ -11123,7 +11124,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema209(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema209(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex419 = (decoder.readIndex());
@@ -11164,7 +11165,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema210(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema210(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex421 = (decoder.readIndex());
@@ -11205,7 +11206,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema211(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema211(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex423 = (decoder.readIndex());
@@ -11246,7 +11247,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema212(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema212(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex425 = (decoder.readIndex());
@@ -11287,7 +11288,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema213(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema213(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex427 = (decoder.readIndex());
@@ -11328,7 +11329,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema214(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema214(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex429 = (decoder.readIndex());
@@ -11369,7 +11370,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema215(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema215(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex431 = (decoder.readIndex());
@@ -11410,7 +11411,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema216(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema216(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex433 = (decoder.readIndex());
@@ -11451,7 +11452,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema217(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema217(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex435 = (decoder.readIndex());
@@ -11492,7 +11493,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema218(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema218(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex437 = (decoder.readIndex());
@@ -11533,7 +11534,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema219(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema219(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex439 = (decoder.readIndex());
@@ -11574,7 +11575,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema220(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema220(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex441 = (decoder.readIndex());
@@ -11615,7 +11616,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema221(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema221(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex443 = (decoder.readIndex());
@@ -11656,7 +11657,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema222(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema222(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex445 = (decoder.readIndex());
@@ -11697,7 +11698,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema223(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema223(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex447 = (decoder.readIndex());
@@ -11738,7 +11739,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema224(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema224(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex449 = (decoder.readIndex());
@@ -11779,7 +11780,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema225(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema225(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex451 = (decoder.readIndex());
@@ -11820,7 +11821,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema226(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema226(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex453 = (decoder.readIndex());
@@ -11861,7 +11862,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema227(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema227(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex455 = (decoder.readIndex());
@@ -11902,7 +11903,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema228(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema228(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex457 = (decoder.readIndex());
@@ -11943,7 +11944,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema229(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema229(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex459 = (decoder.readIndex());
@@ -11984,7 +11985,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema230(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema230(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex461 = (decoder.readIndex());
@@ -12025,7 +12026,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema231(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema231(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex463 = (decoder.readIndex());
@@ -12066,7 +12067,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema232(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema232(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex465 = (decoder.readIndex());
@@ -12107,7 +12108,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema233(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema233(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex467 = (decoder.readIndex());
@@ -12148,7 +12149,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema234(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema234(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex469 = (decoder.readIndex());
@@ -12189,7 +12190,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema235(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema235(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex471 = (decoder.readIndex());
@@ -12230,7 +12231,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema236(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema236(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex473 = (decoder.readIndex());
@@ -12271,7 +12272,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema237(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema237(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex475 = (decoder.readIndex());
@@ -12312,7 +12313,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema238(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema238(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex477 = (decoder.readIndex());
@@ -12353,7 +12354,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema239(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema239(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex479 = (decoder.readIndex());
@@ -12394,7 +12395,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema240(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema240(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex481 = (decoder.readIndex());
@@ -12435,7 +12436,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema241(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema241(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex483 = (decoder.readIndex());
@@ -12476,7 +12477,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema242(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema242(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex485 = (decoder.readIndex());
@@ -12517,7 +12518,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema243(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema243(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex487 = (decoder.readIndex());
@@ -12558,7 +12559,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema244(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema244(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex489 = (decoder.readIndex());
@@ -12599,7 +12600,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema245(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema245(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex491 = (decoder.readIndex());
@@ -12640,7 +12641,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema246(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema246(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex493 = (decoder.readIndex());
@@ -12681,7 +12682,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema247(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema247(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex495 = (decoder.readIndex());
@@ -12722,7 +12723,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema248(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema248(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex497 = (decoder.readIndex());
@@ -12763,7 +12764,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema249(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema249(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex499 = (decoder.readIndex());
@@ -12804,7 +12805,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema250(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema250(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex501 = (decoder.readIndex());
@@ -12845,7 +12846,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema251(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema251(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex503 = (decoder.readIndex());
@@ -12886,7 +12887,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema252(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema252(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex505 = (decoder.readIndex());
@@ -12927,7 +12928,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema253(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema253(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex507 = (decoder.readIndex());
@@ -12968,7 +12969,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema254(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema254(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex509 = (decoder.readIndex());
@@ -13009,7 +13010,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema255(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema255(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex511 = (decoder.readIndex());
@@ -13050,7 +13051,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema256(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema256(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex513 = (decoder.readIndex());
@@ -13091,7 +13092,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema257(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema257(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex515 = (decoder.readIndex());
@@ -13132,7 +13133,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema258(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema258(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex517 = (decoder.readIndex());
@@ -13173,7 +13174,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema259(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema259(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex519 = (decoder.readIndex());
@@ -13214,7 +13215,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema260(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema260(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex521 = (decoder.readIndex());
@@ -13255,7 +13256,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema261(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema261(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex523 = (decoder.readIndex());
@@ -13296,7 +13297,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema262(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema262(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex525 = (decoder.readIndex());
@@ -13337,7 +13338,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema263(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema263(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex527 = (decoder.readIndex());
@@ -13378,7 +13379,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema264(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema264(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex529 = (decoder.readIndex());
@@ -13419,7 +13420,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema265(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema265(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex531 = (decoder.readIndex());
@@ -13460,7 +13461,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema266(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema266(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex533 = (decoder.readIndex());
@@ -13501,7 +13502,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema267(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema267(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex535 = (decoder.readIndex());
@@ -13542,7 +13543,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema268(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema268(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex537 = (decoder.readIndex());
@@ -13583,7 +13584,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema269(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema269(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex539 = (decoder.readIndex());
@@ -13624,7 +13625,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema270(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema270(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex541 = (decoder.readIndex());
@@ -13665,7 +13666,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema271(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema271(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex543 = (decoder.readIndex());
@@ -13706,7 +13707,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema272(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema272(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex545 = (decoder.readIndex());
@@ -13747,7 +13748,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema273(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema273(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex547 = (decoder.readIndex());
@@ -13788,7 +13789,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema274(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema274(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex549 = (decoder.readIndex());
@@ -13829,7 +13830,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema275(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema275(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex551 = (decoder.readIndex());
@@ -13870,7 +13871,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema276(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema276(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex553 = (decoder.readIndex());
@@ -13911,7 +13912,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema277(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema277(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex555 = (decoder.readIndex());
@@ -13952,7 +13953,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema278(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema278(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex557 = (decoder.readIndex());
@@ -13993,7 +13994,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema279(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema279(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex559 = (decoder.readIndex());
@@ -14034,7 +14035,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema280(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema280(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex561 = (decoder.readIndex());
@@ -14075,7 +14076,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema281(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema281(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex563 = (decoder.readIndex());
@@ -14116,7 +14117,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema282(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema282(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex565 = (decoder.readIndex());
@@ -14157,7 +14158,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema283(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema283(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex567 = (decoder.readIndex());
@@ -14198,7 +14199,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema284(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema284(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex569 = (decoder.readIndex());
@@ -14239,7 +14240,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema285(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema285(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex571 = (decoder.readIndex());
@@ -14280,7 +14281,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema286(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema286(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex573 = (decoder.readIndex());
@@ -14321,7 +14322,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema287(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema287(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex575 = (decoder.readIndex());
@@ -14362,7 +14363,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema288(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema288(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex577 = (decoder.readIndex());
@@ -14403,7 +14404,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema289(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema289(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex579 = (decoder.readIndex());
@@ -14444,7 +14445,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema290(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema290(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex581 = (decoder.readIndex());
@@ -14485,7 +14486,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema291(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema291(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex583 = (decoder.readIndex());
@@ -14526,7 +14527,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema292(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema292(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex585 = (decoder.readIndex());
@@ -14567,7 +14568,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema293(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema293(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex587 = (decoder.readIndex());
@@ -14608,7 +14609,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema294(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema294(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex589 = (decoder.readIndex());
@@ -14649,7 +14650,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema295(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema295(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex591 = (decoder.readIndex());
@@ -14690,7 +14691,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema296(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema296(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex593 = (decoder.readIndex());
@@ -14731,7 +14732,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema297(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema297(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex595 = (decoder.readIndex());
@@ -14772,7 +14773,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema298(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema298(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex597 = (decoder.readIndex());
@@ -14813,7 +14814,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema299(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema299(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex599 = (decoder.readIndex());
@@ -14854,7 +14855,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema300(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema300(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex601 = (decoder.readIndex());
@@ -14895,7 +14896,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema301(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema301(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex603 = (decoder.readIndex());
@@ -14936,7 +14937,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema302(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema302(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex605 = (decoder.readIndex());
@@ -14977,7 +14978,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema303(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema303(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex607 = (decoder.readIndex());
@@ -15018,7 +15019,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema304(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema304(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex609 = (decoder.readIndex());
@@ -15059,7 +15060,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema305(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema305(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex611 = (decoder.readIndex());
@@ -15100,7 +15101,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema306(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema306(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex613 = (decoder.readIndex());
@@ -15141,7 +15142,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema307(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema307(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex615 = (decoder.readIndex());
@@ -15182,7 +15183,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema308(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema308(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex617 = (decoder.readIndex());
@@ -15223,7 +15224,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema309(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema309(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex619 = (decoder.readIndex());
@@ -15264,7 +15265,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema310(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema310(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex621 = (decoder.readIndex());
@@ -15305,7 +15306,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema311(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema311(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex623 = (decoder.readIndex());
@@ -15346,7 +15347,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema312(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema312(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex625 = (decoder.readIndex());
@@ -15387,7 +15388,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema313(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema313(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex627 = (decoder.readIndex());
@@ -15428,7 +15429,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema314(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema314(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex629 = (decoder.readIndex());
@@ -15469,7 +15470,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema315(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema315(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex631 = (decoder.readIndex());
@@ -15510,7 +15511,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema316(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema316(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex633 = (decoder.readIndex());
@@ -15551,7 +15552,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema317(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema317(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex635 = (decoder.readIndex());
@@ -15592,7 +15593,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema318(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema318(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex637 = (decoder.readIndex());
@@ -15633,7 +15634,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema319(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema319(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex639 = (decoder.readIndex());
@@ -15674,7 +15675,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema320(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema320(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex641 = (decoder.readIndex());
@@ -15715,7 +15716,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema321(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema321(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex643 = (decoder.readIndex());
@@ -15756,7 +15757,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema322(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema322(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex645 = (decoder.readIndex());
@@ -15797,7 +15798,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema323(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema323(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex647 = (decoder.readIndex());
@@ -15838,7 +15839,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema324(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema324(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex649 = (decoder.readIndex());
@@ -15879,7 +15880,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema325(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema325(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex651 = (decoder.readIndex());
@@ -15920,7 +15921,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema326(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema326(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex653 = (decoder.readIndex());
@@ -15961,7 +15962,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema327(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema327(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex655 = (decoder.readIndex());
@@ -16002,7 +16003,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema328(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema328(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex657 = (decoder.readIndex());
@@ -16043,7 +16044,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema329(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema329(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex659 = (decoder.readIndex());
@@ -16084,7 +16085,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema330(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema330(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex661 = (decoder.readIndex());
@@ -16125,7 +16126,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema331(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema331(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex663 = (decoder.readIndex());
@@ -16166,7 +16167,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema332(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema332(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex665 = (decoder.readIndex());
@@ -16207,7 +16208,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema333(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema333(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex667 = (decoder.readIndex());
@@ -16248,7 +16249,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema334(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema334(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex669 = (decoder.readIndex());
@@ -16289,7 +16290,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema335(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema335(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex671 = (decoder.readIndex());
@@ -16330,7 +16331,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema336(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema336(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex673 = (decoder.readIndex());
@@ -16371,7 +16372,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema337(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema337(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex675 = (decoder.readIndex());
@@ -16412,7 +16413,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema338(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema338(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex677 = (decoder.readIndex());
@@ -16453,7 +16454,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema339(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema339(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex679 = (decoder.readIndex());
@@ -16494,7 +16495,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema340(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema340(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex681 = (decoder.readIndex());
@@ -16535,7 +16536,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema341(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema341(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex683 = (decoder.readIndex());
@@ -16576,7 +16577,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema342(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema342(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex685 = (decoder.readIndex());
@@ -16617,7 +16618,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema343(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema343(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex687 = (decoder.readIndex());
@@ -16658,7 +16659,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema344(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema344(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex689 = (decoder.readIndex());
@@ -16699,7 +16700,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema345(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema345(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex691 = (decoder.readIndex());
@@ -16740,7 +16741,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema346(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema346(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex693 = (decoder.readIndex());
@@ -16781,7 +16782,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema347(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema347(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex695 = (decoder.readIndex());
@@ -16822,7 +16823,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema348(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema348(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex697 = (decoder.readIndex());
@@ -16863,7 +16864,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema349(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema349(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex699 = (decoder.readIndex());
@@ -16904,7 +16905,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema350(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema350(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex701 = (decoder.readIndex());
@@ -16945,7 +16946,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema351(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema351(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex703 = (decoder.readIndex());
@@ -16986,7 +16987,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema352(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema352(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex705 = (decoder.readIndex());
@@ -17027,7 +17028,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema353(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema353(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex707 = (decoder.readIndex());
@@ -17068,7 +17069,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema354(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema354(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex709 = (decoder.readIndex());
@@ -17109,7 +17110,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema355(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema355(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex711 = (decoder.readIndex());
@@ -17150,7 +17151,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema356(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema356(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex713 = (decoder.readIndex());
@@ -17191,7 +17192,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema357(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema357(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex715 = (decoder.readIndex());
@@ -17232,7 +17233,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema358(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema358(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex717 = (decoder.readIndex());
@@ -17273,7 +17274,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema359(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema359(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex719 = (decoder.readIndex());
@@ -17314,7 +17315,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema360(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema360(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex721 = (decoder.readIndex());
@@ -17355,7 +17356,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema361(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema361(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex723 = (decoder.readIndex());
@@ -17396,7 +17397,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema362(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema362(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex725 = (decoder.readIndex());
@@ -17437,7 +17438,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema363(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema363(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex727 = (decoder.readIndex());
@@ -17478,7 +17479,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema364(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema364(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex729 = (decoder.readIndex());
@@ -17519,7 +17520,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema365(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema365(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex731 = (decoder.readIndex());
@@ -17560,7 +17561,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema366(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema366(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex733 = (decoder.readIndex());
@@ -17601,7 +17602,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema367(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema367(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex735 = (decoder.readIndex());
@@ -17642,7 +17643,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema368(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema368(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex737 = (decoder.readIndex());
@@ -17683,7 +17684,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema369(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema369(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex739 = (decoder.readIndex());
@@ -17724,7 +17725,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema370(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema370(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex741 = (decoder.readIndex());
@@ -17765,7 +17766,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema371(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema371(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex743 = (decoder.readIndex());
@@ -17806,7 +17807,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema372(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema372(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex745 = (decoder.readIndex());
@@ -17847,7 +17848,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema373(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema373(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex747 = (decoder.readIndex());
@@ -17888,7 +17889,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema374(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema374(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex749 = (decoder.readIndex());
@@ -17929,7 +17930,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema375(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema375(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex751 = (decoder.readIndex());
@@ -17970,7 +17971,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema376(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema376(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex753 = (decoder.readIndex());
@@ -18011,7 +18012,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema377(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema377(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex755 = (decoder.readIndex());
@@ -18052,7 +18053,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema378(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema378(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex757 = (decoder.readIndex());
@@ -18093,7 +18094,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema379(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema379(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex759 = (decoder.readIndex());
@@ -18134,7 +18135,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema380(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema380(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex761 = (decoder.readIndex());
@@ -18175,7 +18176,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema381(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema381(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex763 = (decoder.readIndex());
@@ -18216,7 +18217,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema382(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema382(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex765 = (decoder.readIndex());
@@ -18257,7 +18258,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema383(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema383(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex767 = (decoder.readIndex());
@@ -18298,7 +18299,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema384(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema384(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex769 = (decoder.readIndex());
@@ -18339,7 +18340,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema385(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema385(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex771 = (decoder.readIndex());
@@ -18380,7 +18381,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema386(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema386(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex773 = (decoder.readIndex());
@@ -18421,7 +18422,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema387(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema387(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex775 = (decoder.readIndex());
@@ -18462,7 +18463,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema388(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema388(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex777 = (decoder.readIndex());
@@ -18503,7 +18504,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema389(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema389(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex779 = (decoder.readIndex());
@@ -18544,7 +18545,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema390(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema390(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex781 = (decoder.readIndex());
@@ -18585,7 +18586,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema391(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema391(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex783 = (decoder.readIndex());
@@ -18626,7 +18627,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema392(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema392(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex785 = (decoder.readIndex());
@@ -18667,7 +18668,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema393(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema393(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex787 = (decoder.readIndex());
@@ -18708,7 +18709,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema394(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema394(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex789 = (decoder.readIndex());
@@ -18749,7 +18750,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema395(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema395(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex791 = (decoder.readIndex());
@@ -18790,7 +18791,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema396(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema396(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex793 = (decoder.readIndex());
@@ -18831,7 +18832,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema397(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema397(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex795 = (decoder.readIndex());
@@ -18872,7 +18873,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema398(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema398(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex797 = (decoder.readIndex());
@@ -18913,7 +18914,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema399(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema399(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex799 = (decoder.readIndex());
@@ -18954,7 +18955,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema400(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema400(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex801 = (decoder.readIndex());
@@ -18995,7 +18996,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema401(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema401(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex803 = (decoder.readIndex());
@@ -19036,7 +19037,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema402(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema402(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex805 = (decoder.readIndex());
@@ -19077,7 +19078,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema403(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema403(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex807 = (decoder.readIndex());
@@ -19118,7 +19119,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema404(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema404(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex809 = (decoder.readIndex());
@@ -19159,7 +19160,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema405(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema405(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex811 = (decoder.readIndex());
@@ -19200,7 +19201,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema406(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema406(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex813 = (decoder.readIndex());
@@ -19241,7 +19242,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema407(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema407(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex815 = (decoder.readIndex());
@@ -19282,7 +19283,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema408(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema408(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex817 = (decoder.readIndex());
@@ -19323,7 +19324,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema409(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema409(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex819 = (decoder.readIndex());
@@ -19364,7 +19365,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema410(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema410(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex821 = (decoder.readIndex());
@@ -19405,7 +19406,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema411(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema411(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex823 = (decoder.readIndex());
@@ -19446,7 +19447,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema412(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema412(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex825 = (decoder.readIndex());
@@ -19487,7 +19488,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema413(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema413(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex827 = (decoder.readIndex());
@@ -19528,7 +19529,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema414(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema414(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex829 = (decoder.readIndex());
@@ -19569,7 +19570,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema415(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema415(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex831 = (decoder.readIndex());
@@ -19610,7 +19611,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema416(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema416(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex833 = (decoder.readIndex());
@@ -19651,7 +19652,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema417(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema417(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex835 = (decoder.readIndex());
@@ -19692,7 +19693,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema418(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema418(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex837 = (decoder.readIndex());
@@ -19733,7 +19734,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema419(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema419(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex839 = (decoder.readIndex());
@@ -19774,7 +19775,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema420(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema420(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex841 = (decoder.readIndex());
@@ -19815,7 +19816,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema421(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema421(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex843 = (decoder.readIndex());
@@ -19856,7 +19857,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema422(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema422(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex845 = (decoder.readIndex());
@@ -19897,7 +19898,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema423(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema423(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex847 = (decoder.readIndex());
@@ -19938,7 +19939,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema424(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema424(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex849 = (decoder.readIndex());
@@ -19979,7 +19980,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema425(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema425(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex851 = (decoder.readIndex());
@@ -20020,7 +20021,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema426(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema426(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex853 = (decoder.readIndex());
@@ -20061,7 +20062,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema427(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema427(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex855 = (decoder.readIndex());
@@ -20102,7 +20103,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema428(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema428(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex857 = (decoder.readIndex());
@@ -20143,7 +20144,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema429(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema429(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex859 = (decoder.readIndex());
@@ -20184,7 +20185,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema430(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema430(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex861 = (decoder.readIndex());
@@ -20225,7 +20226,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema431(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema431(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex863 = (decoder.readIndex());
@@ -20266,7 +20267,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema432(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema432(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex865 = (decoder.readIndex());
@@ -20307,7 +20308,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema433(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema433(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex867 = (decoder.readIndex());
@@ -20348,7 +20349,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema434(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema434(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex869 = (decoder.readIndex());
@@ -20389,7 +20390,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema435(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema435(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex871 = (decoder.readIndex());
@@ -20430,7 +20431,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema436(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema436(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex873 = (decoder.readIndex());
@@ -20471,7 +20472,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema437(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema437(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex875 = (decoder.readIndex());
@@ -20512,7 +20513,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema438(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema438(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex877 = (decoder.readIndex());
@@ -20553,7 +20554,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema439(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema439(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex879 = (decoder.readIndex());
@@ -20594,7 +20595,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema440(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema440(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex881 = (decoder.readIndex());
@@ -20635,7 +20636,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema441(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema441(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex883 = (decoder.readIndex());
@@ -20676,7 +20677,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema442(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema442(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex885 = (decoder.readIndex());
@@ -20717,7 +20718,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema443(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema443(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex887 = (decoder.readIndex());
@@ -20758,7 +20759,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema444(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema444(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex889 = (decoder.readIndex());
@@ -20799,7 +20800,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema445(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema445(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex891 = (decoder.readIndex());
@@ -20840,7 +20841,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema446(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema446(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex893 = (decoder.readIndex());
@@ -20881,7 +20882,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema447(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema447(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex895 = (decoder.readIndex());
@@ -20922,7 +20923,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema448(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema448(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex897 = (decoder.readIndex());
@@ -20963,7 +20964,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema449(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema449(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex899 = (decoder.readIndex());
@@ -21004,7 +21005,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema450(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema450(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex901 = (decoder.readIndex());
@@ -21045,7 +21046,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema451(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema451(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex903 = (decoder.readIndex());
@@ -21086,7 +21087,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema452(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema452(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex905 = (decoder.readIndex());
@@ -21127,7 +21128,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema453(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema453(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex907 = (decoder.readIndex());
@@ -21168,7 +21169,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema454(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema454(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex909 = (decoder.readIndex());
@@ -21209,7 +21210,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema455(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema455(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex911 = (decoder.readIndex());
@@ -21250,7 +21251,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema456(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema456(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex913 = (decoder.readIndex());
@@ -21291,7 +21292,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema457(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema457(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex915 = (decoder.readIndex());
@@ -21332,7 +21333,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema458(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema458(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex917 = (decoder.readIndex());
@@ -21373,7 +21374,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema459(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema459(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex919 = (decoder.readIndex());
@@ -21414,7 +21415,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema460(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema460(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex921 = (decoder.readIndex());
@@ -21455,7 +21456,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema461(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema461(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex923 = (decoder.readIndex());
@@ -21496,7 +21497,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema462(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema462(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex925 = (decoder.readIndex());
@@ -21537,7 +21538,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema463(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema463(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex927 = (decoder.readIndex());
@@ -21578,7 +21579,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema464(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema464(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex929 = (decoder.readIndex());
@@ -21619,7 +21620,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema465(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema465(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex931 = (decoder.readIndex());
@@ -21660,7 +21661,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema466(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema466(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex933 = (decoder.readIndex());
@@ -21701,7 +21702,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema467(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema467(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex935 = (decoder.readIndex());
@@ -21742,7 +21743,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema468(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema468(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex937 = (decoder.readIndex());
@@ -21783,7 +21784,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema469(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema469(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex939 = (decoder.readIndex());
@@ -21824,7 +21825,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema470(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema470(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex941 = (decoder.readIndex());
@@ -21865,7 +21866,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema471(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema471(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex943 = (decoder.readIndex());
@@ -21906,7 +21907,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema472(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema472(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex945 = (decoder.readIndex());
@@ -21947,7 +21948,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema473(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema473(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex947 = (decoder.readIndex());
@@ -21988,7 +21989,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema474(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema474(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex949 = (decoder.readIndex());
@@ -22029,7 +22030,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema475(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema475(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex951 = (decoder.readIndex());
@@ -22070,7 +22071,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema476(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema476(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex953 = (decoder.readIndex());
@@ -22111,7 +22112,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema477(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema477(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex955 = (decoder.readIndex());
@@ -22152,7 +22153,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema478(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema478(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex957 = (decoder.readIndex());
@@ -22193,7 +22194,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema479(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema479(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex959 = (decoder.readIndex());
@@ -22234,7 +22235,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema480(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema480(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex961 = (decoder.readIndex());
@@ -22275,7 +22276,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema481(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema481(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex963 = (decoder.readIndex());
@@ -22316,7 +22317,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema482(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema482(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex965 = (decoder.readIndex());
@@ -22357,7 +22358,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema483(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema483(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex967 = (decoder.readIndex());
@@ -22398,7 +22399,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema484(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema484(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex969 = (decoder.readIndex());
@@ -22439,7 +22440,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema485(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema485(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex971 = (decoder.readIndex());
@@ -22480,7 +22481,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema486(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema486(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex973 = (decoder.readIndex());
@@ -22521,7 +22522,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema487(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema487(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex975 = (decoder.readIndex());
@@ -22562,7 +22563,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema488(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema488(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex977 = (decoder.readIndex());
@@ -22603,7 +22604,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema489(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema489(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex979 = (decoder.readIndex());
@@ -22644,7 +22645,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema490(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema490(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex981 = (decoder.readIndex());
@@ -22685,7 +22686,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema491(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema491(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex983 = (decoder.readIndex());
@@ -22726,7 +22727,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema492(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema492(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex985 = (decoder.readIndex());
@@ -22767,7 +22768,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema493(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema493(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex987 = (decoder.readIndex());
@@ -22808,7 +22809,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema494(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema494(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex989 = (decoder.readIndex());
@@ -22849,7 +22850,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema495(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema495(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex991 = (decoder.readIndex());
@@ -22890,7 +22891,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema496(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema496(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex993 = (decoder.readIndex());
@@ -22931,7 +22932,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema497(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema497(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex995 = (decoder.readIndex());
@@ -22972,7 +22973,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema498(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema498(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex997 = (decoder.readIndex());
@@ -23013,7 +23014,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVer
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema499(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema499(IndexedRecord FastGenericDeserializerGeneratorTest_shouldBeAbleToReadVeryLargeSchema, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex999 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadAliasedField_GenericDeserializer_1824759546_1574596677.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadAliasedField_GenericDeserializer_1824759546_1574596677.java
index e1343d7ac..42e51f6ce 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadAliasedField_GenericDeserializer_1824759546_1574596677.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadAliasedField_GenericDeserializer_1824759546_1574596677.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -22,13 +23,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadAliasedField_GenericDeseri
         this.testStringUnionAlias0 = readerSchema.getField("testStringUnionAlias").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadAliasedField0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadAliasedField0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadAliasedField0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadAliasedField0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadAliasedField;
@@ -55,11 +56,11 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadA
                 throw new RuntimeException(("Illegal union index for 'testString': "+ unionIndex0));
             }
         }
-        populate_FastGenericDeserializerGeneratorTest_shouldReadAliasedField0((FastGenericDeserializerGeneratorTest_shouldReadAliasedField), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadAliasedField0((FastGenericDeserializerGeneratorTest_shouldReadAliasedField), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadAliasedField;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadAliasedField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadAliasedField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadAliasedField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadAliasedField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadEnumDefault_GenericDeserializer_693116719_1739184158.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadEnumDefault_GenericDeserializer_693116719_1739184158.java
index 320591b7e..c389ff965 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadEnumDefault_GenericDeserializer_693116719_1739184158.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadEnumDefault_GenericDeserializer_693116719_1739184158.java
@@ -7,6 +7,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
@@ -58,13 +59,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadEnumDefault_GenericDeseria
         this.enumMappingtestEnum3 = Collections.unmodifiableMap(tempEnumMapping3);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadEnumDefault0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadEnumDefault0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadEnumDefault0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadEnumDefault0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnumDefault;
@@ -86,12 +87,12 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadE
             }
         }
         FastGenericDeserializerGeneratorTest_shouldReadEnumDefault.put(0, enumValue0);
-        populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault0((FastGenericDeserializerGeneratorTest_shouldReadEnumDefault), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault1((FastGenericDeserializerGeneratorTest_shouldReadEnumDefault), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault0((FastGenericDeserializerGeneratorTest_shouldReadEnumDefault), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault1((FastGenericDeserializerGeneratorTest_shouldReadEnumDefault), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadEnumDefault;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnumDefault, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnumDefault, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -151,7 +152,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault
         FastGenericDeserializerGeneratorTest_shouldReadEnumDefault.put(2, testEnumArray1);
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnumDefault, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnumDefault1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnumDefault, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericEnumSymbol> testEnumUnionArray1 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadEnum_GenericDeserializer_695378847_695378847.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadEnum_GenericDeserializer_695378847_695378847.java
index 1a3daa824..d4a658dc2 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadEnum_GenericDeserializer_695378847_695378847.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadEnum_GenericDeserializer_695378847_695378847.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.GenericEnumSymbol;
@@ -30,13 +31,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadEnum_GenericDeserializer_6
         this.testEnumUnionArrayArrayElemSchema0 = testEnumUnionArray0 .getElementType();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadEnum0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadEnum0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadEnum0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadEnum0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnum;
@@ -46,12 +47,12 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadE
             FastGenericDeserializerGeneratorTest_shouldReadEnum = new org.apache.avro.generic.GenericData.Record(readerSchema);
         }
         FastGenericDeserializerGeneratorTest_shouldReadEnum.put(0, new org.apache.avro.generic.GenericData.EnumSymbol(testEnum0, testEnum0 .getEnumSymbols().get((decoder.readEnum()))));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadEnum0((FastGenericDeserializerGeneratorTest_shouldReadEnum), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadEnum1((FastGenericDeserializerGeneratorTest_shouldReadEnum), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadEnum0((FastGenericDeserializerGeneratorTest_shouldReadEnum), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadEnum1((FastGenericDeserializerGeneratorTest_shouldReadEnum), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadEnum;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnum0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnum, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnum0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnum, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -87,7 +88,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnum0(Index
         FastGenericDeserializerGeneratorTest_shouldReadEnum.put(2, testEnumArray1);
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnum1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnum, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadEnum1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadEnum, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericEnumSymbol> testEnumUnionArray1 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadFixed_GenericDeserializer_1590965143_1590965143.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadFixed_GenericDeserializer_1590965143_1590965143.java
index 9c72ec426..e152b0bf1 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadFixed_GenericDeserializer_1590965143_1590965143.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadFixed_GenericDeserializer_1590965143_1590965143.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.GenericFixed;
@@ -30,13 +31,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadFixed_GenericDeserializer_
         this.testFixedUnionArrayArrayElemSchema0 = testFixedUnionArray0 .getElementType();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadFixed0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadFixed0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadFixed0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadFixed0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadFixed;
@@ -54,12 +55,12 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadF
         }
         decoder.readFixed(testFixed1);
         FastGenericDeserializerGeneratorTest_shouldReadFixed.put(0, new org.apache.avro.generic.GenericData.Fixed(testFixed0, testFixed1));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadFixed0((FastGenericDeserializerGeneratorTest_shouldReadFixed), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadFixed1((FastGenericDeserializerGeneratorTest_shouldReadFixed), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadFixed0((FastGenericDeserializerGeneratorTest_shouldReadFixed), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadFixed1((FastGenericDeserializerGeneratorTest_shouldReadFixed), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadFixed;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadFixed0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadFixed, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadFixed0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadFixed, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -115,7 +116,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadFixed0(Inde
         FastGenericDeserializerGeneratorTest_shouldReadFixed.put(2, testFixedArray1);
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadFixed1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadFixed, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadFixed1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadFixed, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericFixed> testFixedUnionArray1 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion_GenericDeserializer_2643982_2643982.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion_GenericDeserializer_2643982_2643982.java
index 9a6bf56b3..bf817fd83 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion_GenericDeserializer_2643982_2643982.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion_GenericDeserializer_2643982_2643982.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,13 +25,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion_Generi
         this.subField0 = unionOptionSchema0 .getField("subField").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion;
@@ -45,7 +46,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadM
             FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion.put(0, null);
         } else {
             if (unionIndex0 == 1) {
-                FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion.get(0), (decoder)));
+                FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion.get(0), (decoder), (customization)));
             } else {
                 if (unionIndex0 == 2) {
                     Utf8 charSequence1;
@@ -68,7 +69,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadM
         return FastGenericDeserializerGeneratorTest_shouldReadMultipleChoiceUnion;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadNestedMap_GenericDeserializer_1870075541_1870075541.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadNestedMap_GenericDeserializer_1870075541_1870075541.java
index 6ba24cae2..cdf467e1c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadNestedMap_GenericDeserializer_1870075541_1870075541.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadNestedMap_GenericDeserializer_1870075541_1870075541.java
@@ -2,11 +2,11 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -29,13 +29,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadNestedMap_GenericDeseriali
         this.mapFieldValueMapValueSchema0 = mapFieldMapValueSchema0 .getValueType();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadNestedMap0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadNestedMap0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadNestedMap0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadNestedMap0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadNestedMap;
@@ -47,33 +47,14 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadN
         Map<Utf8, Map<Utf8, List<Integer>>> mapField1 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, Map<Utf8, List<Integer>>> mapFieldReuse0 = null;
-            Object oldMap0 = FastGenericDeserializerGeneratorTest_shouldReadNestedMap.get(0);
-            if (oldMap0 instanceof Map) {
-                mapFieldReuse0 = ((Map) oldMap0);
-            }
-            if (mapFieldReuse0 != (null)) {
-                mapFieldReuse0 .clear();
-                mapField1 = mapFieldReuse0;
-            } else {
-                mapField1 = new HashMap<Utf8, Map<Utf8, List<Integer>>>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            mapField1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadNestedMap.get(0), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
                     Map<Utf8, List<Integer>> mapFieldValue0 = null;
                     long chunkLen1 = (decoder.readMapStart());
                     if (chunkLen1 > 0) {
-                        Map<Utf8, List<Integer>> mapFieldValueReuse0 = null;
-                        if (null instanceof Map) {
-                            mapFieldValueReuse0 = ((Map) null);
-                        }
-                        if (mapFieldValueReuse0 != (null)) {
-                            mapFieldValueReuse0 .clear();
-                            mapFieldValue0 = mapFieldValueReuse0;
-                        } else {
-                            mapFieldValue0 = new HashMap<Utf8, List<Integer>>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-                        }
+                        mapFieldValue0 = ((Map)(customization).getNewMapOverrideFunc().apply(null, ((int) chunkLen1)));
                         do {
                             for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                                 Utf8 key1 = (decoder.readString(null));
@@ -96,14 +77,14 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadN
                             chunkLen1 = (decoder.mapNext());
                         } while (chunkLen1 > 0);
                     } else {
-                        mapFieldValue0 = new HashMap<Utf8, List<Integer>>(0);
+                        mapFieldValue0 = ((Map)(customization).getNewMapOverrideFunc().apply(null, 0));
                     }
                     mapField1 .put(key0, mapFieldValue0);
                 }
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            mapField1 = new HashMap<Utf8, Map<Utf8, List<Integer>>>(0);
+            mapField1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadNestedMap.get(0), 0));
         }
         FastGenericDeserializerGeneratorTest_shouldReadNestedMap.put(0, mapField1);
         return FastGenericDeserializerGeneratorTest_shouldReadNestedMap;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum_GenericDeserializer_611749105_646016208.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum_GenericDeserializer_611749105_646016208.java
index 3dd52ee5f..3c062789b 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum_GenericDeserializer_611749105_646016208.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum_GenericDeserializer_611749105_646016208.java
@@ -7,6 +7,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
@@ -66,13 +67,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum_GenericDese
         this.enumMappingtestEnum3 = Collections.unmodifiableMap(tempEnumMapping3);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum;
@@ -94,12 +95,12 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadP
             }
         }
         FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum.put(0, enumValue0);
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum0((FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum1((FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum0((FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum1((FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -159,7 +160,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedE
         FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum.put(2, testEnumArray1);
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPermutatedEnum, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericEnumSymbol> testEnumUnionArray1 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadPrimitives_GenericDeserializer_1966544736_1966544736.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadPrimitives_GenericDeserializer_1966544736_1966544736.java
index d282cf38a..7db7cd863 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadPrimitives_GenericDeserializer_1966544736_1966544736.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadPrimitives_GenericDeserializer_1966544736_1966544736.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -33,13 +34,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadPrimitives_GenericDeserial
         this.testBytesUnion0 = readerSchema.getField("testBytesUnion").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadPrimitives0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadPrimitives0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadPrimitives0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadPrimitives0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives;
@@ -49,17 +50,17 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadP
             FastGenericDeserializerGeneratorTest_shouldReadPrimitives = new org.apache.avro.generic.GenericData.Record(readerSchema);
         }
         FastGenericDeserializerGeneratorTest_shouldReadPrimitives.put(0, (decoder.readInt()));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives0((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives1((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives2((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives3((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives4((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives5((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives6((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives0((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives1((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives2((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives3((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives4((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives5((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives6((FastGenericDeserializerGeneratorTest_shouldReadPrimitives), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadPrimitives;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -83,7 +84,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives0
         FastGenericDeserializerGeneratorTest_shouldReadPrimitives.put(2, charSequence0);
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -107,7 +108,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives1
         FastGenericDeserializerGeneratorTest_shouldReadPrimitives.put(4, (decoder.readLong()));
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives2(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives2(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -124,7 +125,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives2
         FastGenericDeserializerGeneratorTest_shouldReadPrimitives.put(6, (decoder.readDouble()));
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives3(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives3(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -141,7 +142,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives3
         FastGenericDeserializerGeneratorTest_shouldReadPrimitives.put(8, (decoder.readFloat()));
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives4(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives4(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -158,7 +159,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives4
         FastGenericDeserializerGeneratorTest_shouldReadPrimitives.put(10, (decoder.readBoolean()));
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives5(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives5(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -182,7 +183,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives5
         FastGenericDeserializerGeneratorTest_shouldReadPrimitives.put(12, byteBuffer0);
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives6(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadPrimitives6(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadPrimitives, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields_GenericDeserializer_1274815349_1365753944.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields_GenericDeserializer_1274815349_1365753944.java
index 3d5b7735d..9ea44abf9 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields_GenericDeserializer_1274815349_1365753944.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields_GenericDeserializer_1274815349_1365753944.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -32,13 +33,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecor
         this.recordArray0 = readerSchema.getField("recordArray").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields;
@@ -47,12 +48,12 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadS
         } else {
             FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields = new org.apache.avro.generic.GenericData.Record(readerSchema);
         }
-        FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(0), (decoder)));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0((FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields), (decoder));
+        FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(0), (decoder), (customization)));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0((FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -83,10 +84,10 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
         return subRecord;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(1, deserializesubRecord1(FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(1), (decoder)));
+        FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(1, deserializesubRecord1(FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(1), (decoder), (customization)));
         List<IndexedRecord> recordArray1 = null;
         long chunkLen0 = (decoder.readArrayStart());
         Object oldArray0 = FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(2);
@@ -106,14 +107,14 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAnd
                 if (oldArray0 instanceof GenericArray) {
                     recordArrayArrayElementReuseVar0 = ((GenericArray) oldArray0).peek();
                 }
-                recordArray1 .add(deserializesubRecord0(recordArrayArrayElementReuseVar0, (decoder)));
+                recordArray1 .add(deserializesubRecord0(recordArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen0 = (decoder.arrayNext());
         }
         FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(2, recordArray1);
     }
 
-    public IndexedRecord deserializesubRecord1(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord1(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -133,11 +134,11 @@ public IndexedRecord deserializesubRecord1(Object reuse, Decoder decoder)
                 throw new RuntimeException(("Illegal union index for 'intField': "+ unionIndex1));
             }
         }
-        populate_subRecord0((subRecord), (decoder));
+        populate_subRecord0((subRecord), (customization), (decoder));
         return subRecord;
     }
 
-    private void populate_subRecord0(IndexedRecord subRecord, Decoder decoder)
+    private void populate_subRecord0(IndexedRecord subRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields_GenericDeserializer_1365753944_1274815349.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields_GenericDeserializer_1365753944_1274815349.java
index e84ee31ed..f3010081c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields_GenericDeserializer_1365753944_1274815349.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields_GenericDeserializer_1365753944_1274815349.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -32,13 +33,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecor
         this.recordArray0 = readerSchema.getField("recordArray").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields;
@@ -47,12 +48,12 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadS
         } else {
             FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields = new org.apache.avro.generic.GenericData.Record(readerSchema);
         }
-        FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(0, deserializealiasedSubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(0), (decoder)));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0((FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields), (decoder));
+        FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(0, deserializealiasedSubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(0), (decoder), (customization)));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0((FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields;
     }
 
-    public IndexedRecord deserializealiasedSubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializealiasedSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord aliasedSubRecord;
@@ -71,11 +72,11 @@ public IndexedRecord deserializealiasedSubRecord0(Object reuse, Decoder decoder)
                 throw new RuntimeException(("Illegal union index for 'intField': "+ unionIndex0));
             }
         }
-        populate_aliasedSubRecord0((aliasedSubRecord), (decoder));
+        populate_aliasedSubRecord0((aliasedSubRecord), (customization), (decoder));
         return aliasedSubRecord;
     }
 
-    private void populate_aliasedSubRecord0(IndexedRecord aliasedSubRecord, Decoder decoder)
+    private void populate_aliasedSubRecord0(IndexedRecord aliasedSubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -98,10 +99,10 @@ private void populate_aliasedSubRecord0(IndexedRecord aliasedSubRecord, Decoder
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(1, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(1), (decoder)));
+        FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(1, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(1), (decoder), (customization)));
         List<IndexedRecord> recordArray1 = null;
         long chunkLen0 = (decoder.readArrayStart());
         Object oldArray0 = FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.get(2);
@@ -121,14 +122,14 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSplittedAnd
                 if (oldArray0 instanceof GenericArray) {
                     recordArrayArrayElementReuseVar0 = ((GenericArray) oldArray0).peek();
                 }
-                recordArray1 .add(deserializealiasedSubRecord0(recordArrayArrayElementReuseVar0, (decoder)));
+                recordArray1 .add(deserializealiasedSubRecord0(recordArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen0 = (decoder.arrayNext());
         }
         FastGenericDeserializerGeneratorTest_shouldReadSplittedAndAliasedSubRecordFields.put(2, recordArray1);
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord aliasedSubRecord;
@@ -148,11 +149,11 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
                 throw new RuntimeException(("Illegal union index for 'intField': "+ unionIndex2));
             }
         }
-        populate_aliasedSubRecord1((aliasedSubRecord), (decoder));
+        populate_aliasedSubRecord1((aliasedSubRecord), (customization), (decoder));
         return aliasedSubRecord;
     }
 
-    private void populate_aliasedSubRecord1(IndexedRecord aliasedSubRecord, Decoder decoder)
+    private void populate_aliasedSubRecord1(IndexedRecord aliasedSubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField_GenericDeserializer_1602399407_1602399407.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField_GenericDeserializer_1602399407_1602399407.java
index 90c1028b2..fb5668570 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField_GenericDeserializer_1602399407_1602399407.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField_GenericDeserializer_1602399407_1602399407.java
@@ -2,10 +2,10 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -42,13 +42,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField_
         this.recordsMapUnionOptionMapValueSchema0 = recordsMapUnionOptionSchema0 .getValueType();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField;
@@ -76,17 +76,17 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadS
                 if (oldArray0 instanceof GenericArray) {
                     recordsArrayArrayElementReuseVar0 = ((GenericArray) oldArray0).peek();
                 }
-                recordsArray1 .add(deserializesubRecord0(recordsArrayArrayElementReuseVar0, (decoder)));
+                recordsArray1 .add(deserializesubRecord0(recordsArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen0 = (decoder.arrayNext());
         }
         FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.put(0, recordsArray1);
-        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField0((FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField1((FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField0((FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField1((FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -116,32 +116,22 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
         return subRecord;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, IndexedRecord> recordsMap1 = null;
         long chunkLen1 = (decoder.readMapStart());
         if (chunkLen1 > 0) {
-            Map<Utf8, IndexedRecord> recordsMapReuse0 = null;
-            Object oldMap0 = FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.get(1);
-            if (oldMap0 instanceof Map) {
-                recordsMapReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapReuse0 != (null)) {
-                recordsMapReuse0 .clear();
-                recordsMap1 = recordsMapReuse0;
-            } else {
-                recordsMap1 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-            }
+            recordsMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.get(1), ((int) chunkLen1)));
             do {
                 for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    recordsMap1 .put(key0, deserializesubRecord0(null, (decoder)));
+                    recordsMap1 .put(key0, deserializesubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen1 = (decoder.mapNext());
             } while (chunkLen1 > 0);
         } else {
-            recordsMap1 = new HashMap<Utf8, IndexedRecord>(0);
+            recordsMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.get(1), 0));
         }
         FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.put(1, recordsMap1);
         int unionIndex1 = (decoder.readIndex());
@@ -175,7 +165,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                             recordsArrayUnionOption0 .add(null);
                         } else {
                             if (unionIndex2 == 1) {
-                                recordsArrayUnionOption0 .add(deserializesubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder)));
+                                recordsArrayUnionOption0 .add(deserializesubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder), (customization)));
                             } else {
                                 throw new RuntimeException(("Illegal union index for 'recordsArrayUnionOptionElem': "+ unionIndex2));
                             }
@@ -190,7 +180,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -202,17 +192,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                 Map<Utf8, IndexedRecord> recordsMapUnionOption0 = null;
                 long chunkLen3 = (decoder.readMapStart());
                 if (chunkLen3 > 0) {
-                    Map<Utf8, IndexedRecord> recordsMapUnionOptionReuse0 = null;
-                    Object oldMap1 = FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.get(3);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapUnionOptionReuse0 != (null)) {
-                        recordsMapUnionOptionReuse0 .clear();
-                        recordsMapUnionOption0 = recordsMapUnionOptionReuse0;
-                    } else {
-                        recordsMapUnionOption0 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen3 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.get(3), ((int) chunkLen3)));
                     do {
                         for (int counter3 = 0; (counter3 <chunkLen3); counter3 ++) {
                             Utf8 key1 = (decoder.readString(null));
@@ -222,7 +202,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                                 recordsMapUnionOption0 .put(key1, null);
                             } else {
                                 if (unionIndex4 == 1) {
-                                    recordsMapUnionOption0 .put(key1, deserializesubRecord0(null, (decoder)));
+                                    recordsMapUnionOption0 .put(key1, deserializesubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapUnionOptionValue': "+ unionIndex4));
                                 }
@@ -231,7 +211,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                         chunkLen3 = (decoder.mapNext());
                     } while (chunkLen3 > 0);
                 } else {
-                    recordsMapUnionOption0 = new HashMap<Utf8, IndexedRecord>(0);
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.get(3), 0));
                 }
                 FastGenericDeserializerGeneratorTest_shouldReadSubRecordCollectionsField.put(3, recordsMapUnionOption0);
             } else {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField_GenericDeserializer_624658481_624658481.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField_GenericDeserializer_624658481_624658481.java
index 48996fc1e..0d32a2ec5 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField_GenericDeserializer_624658481_624658481.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField_GenericDeserializer_624658481_624658481.java
@@ -2,10 +2,10 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -50,13 +50,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollection
         this.recordsMapArrayUnionOptionValueArrayElemSchema0 = recordsMapArrayMapValueSchema0 .getElementType();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField;
@@ -87,16 +87,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadS
                 Map<Utf8, IndexedRecord> recordsArrayMapElem0 = null;
                 long chunkLen1 = (decoder.readMapStart());
                 if (chunkLen1 > 0) {
-                    Map<Utf8, IndexedRecord> recordsArrayMapElemReuse0 = null;
-                    if (recordsArrayMapArrayElementReuseVar0 instanceof Map) {
-                        recordsArrayMapElemReuse0 = ((Map) recordsArrayMapArrayElementReuseVar0);
-                    }
-                    if (recordsArrayMapElemReuse0 != (null)) {
-                        recordsArrayMapElemReuse0 .clear();
-                        recordsArrayMapElem0 = recordsArrayMapElemReuse0;
-                    } else {
-                        recordsArrayMapElem0 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-                    }
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, ((int) chunkLen1)));
                     do {
                         for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                             Utf8 key0 = (decoder.readString(null));
@@ -106,7 +97,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadS
                                 recordsArrayMapElem0 .put(key0, null);
                             } else {
                                 if (unionIndex0 == 1) {
-                                    recordsArrayMapElem0 .put(key0, deserializesubRecord0(null, (decoder)));
+                                    recordsArrayMapElem0 .put(key0, deserializesubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsArrayMapElemValue': "+ unionIndex0));
                                 }
@@ -115,19 +106,19 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadS
                         chunkLen1 = (decoder.mapNext());
                     } while (chunkLen1 > 0);
                 } else {
-                    recordsArrayMapElem0 = new HashMap<Utf8, IndexedRecord>(0);
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, 0));
                 }
                 recordsArrayMap1 .add(recordsArrayMapElem0);
             }
             chunkLen0 = (decoder.arrayNext());
         }
         FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.put(0, recordsArrayMap1);
-        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField0((FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField1((FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField0((FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField1((FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -157,23 +148,13 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
         return subRecord;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, List<IndexedRecord>> recordsMapArray1 = null;
         long chunkLen2 = (decoder.readMapStart());
         if (chunkLen2 > 0) {
-            Map<Utf8, List<IndexedRecord>> recordsMapArrayReuse0 = null;
-            Object oldMap0 = FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.get(1);
-            if (oldMap0 instanceof Map) {
-                recordsMapArrayReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapArrayReuse0 != (null)) {
-                recordsMapArrayReuse0 .clear();
-                recordsMapArray1 = recordsMapArrayReuse0;
-            } else {
-                recordsMapArray1 = new HashMap<Utf8, List<IndexedRecord>>(((int)(((chunkLen2 * 4)+ 2)/ 3)));
-            }
+            recordsMapArray1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.get(1), ((int) chunkLen2)));
             do {
                 for (int counter2 = 0; (counter2 <chunkLen2); counter2 ++) {
                     Utf8 key1 = (decoder.readString(null));
@@ -201,7 +182,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                                 recordsMapArrayValue0 .add(null);
                             } else {
                                 if (unionIndex2 == 1) {
-                                    recordsMapArrayValue0 .add(deserializesubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder)));
+                                    recordsMapArrayValue0 .add(deserializesubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapArrayValueElem': "+ unionIndex2));
                                 }
@@ -214,7 +195,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                 chunkLen2 = (decoder.mapNext());
             } while (chunkLen2 > 0);
         } else {
-            recordsMapArray1 = new HashMap<Utf8, List<IndexedRecord>>(0);
+            recordsMapArray1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.get(1), 0));
         }
         FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.put(1, recordsMapArray1);
         int unionIndex3 = (decoder.readIndex());
@@ -245,16 +226,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                         Map<Utf8, IndexedRecord> recordsArrayMapUnionOptionElem0 = null;
                         long chunkLen5 = (decoder.readMapStart());
                         if (chunkLen5 > 0) {
-                            Map<Utf8, IndexedRecord> recordsArrayMapUnionOptionElemReuse0 = null;
-                            if (recordsArrayMapUnionOptionArrayElementReuseVar0 instanceof Map) {
-                                recordsArrayMapUnionOptionElemReuse0 = ((Map) recordsArrayMapUnionOptionArrayElementReuseVar0);
-                            }
-                            if (recordsArrayMapUnionOptionElemReuse0 != (null)) {
-                                recordsArrayMapUnionOptionElemReuse0 .clear();
-                                recordsArrayMapUnionOptionElem0 = recordsArrayMapUnionOptionElemReuse0;
-                            } else {
-                                recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen5 * 4)+ 2)/ 3)));
-                            }
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, ((int) chunkLen5)));
                             do {
                                 for (int counter5 = 0; (counter5 <chunkLen5); counter5 ++) {
                                     Utf8 key2 = (decoder.readString(null));
@@ -264,7 +236,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                                         recordsArrayMapUnionOptionElem0 .put(key2, null);
                                     } else {
                                         if (unionIndex4 == 1) {
-                                            recordsArrayMapUnionOptionElem0 .put(key2, deserializesubRecord0(null, (decoder)));
+                                            recordsArrayMapUnionOptionElem0 .put(key2, deserializesubRecord0(null, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsArrayMapUnionOptionElemValue': "+ unionIndex4));
                                         }
@@ -273,7 +245,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                                 chunkLen5 = (decoder.mapNext());
                             } while (chunkLen5 > 0);
                         } else {
-                            recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, IndexedRecord>(0);
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, 0));
                         }
                         recordsArrayMapUnionOption0 .add(recordsArrayMapUnionOptionElem0);
                     }
@@ -286,7 +258,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -298,17 +270,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                 Map<Utf8, List<IndexedRecord>> recordsMapArrayUnionOption0 = null;
                 long chunkLen6 = (decoder.readMapStart());
                 if (chunkLen6 > 0) {
-                    Map<Utf8, List<IndexedRecord>> recordsMapArrayUnionOptionReuse0 = null;
-                    Object oldMap1 = FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.get(3);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapArrayUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapArrayUnionOptionReuse0 != (null)) {
-                        recordsMapArrayUnionOptionReuse0 .clear();
-                        recordsMapArrayUnionOption0 = recordsMapArrayUnionOptionReuse0;
-                    } else {
-                        recordsMapArrayUnionOption0 = new HashMap<Utf8, List<IndexedRecord>>(((int)(((chunkLen6 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.get(3), ((int) chunkLen6)));
                     do {
                         for (int counter6 = 0; (counter6 <chunkLen6); counter6 ++) {
                             Utf8 key3 = (decoder.readString(null));
@@ -336,7 +298,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                                         recordsMapArrayUnionOptionValue0 .add(null);
                                     } else {
                                         if (unionIndex6 == 1) {
-                                            recordsMapArrayUnionOptionValue0 .add(deserializesubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder)));
+                                            recordsMapArrayUnionOptionValue0 .add(deserializesubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsMapArrayUnionOptionValueElem': "+ unionIndex6));
                                         }
@@ -349,7 +311,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordCo
                         chunkLen6 = (decoder.mapNext());
                     } while (chunkLen6 > 0);
                 } else {
-                    recordsMapArrayUnionOption0 = new HashMap<Utf8, List<IndexedRecord>>(0);
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.get(3), 0));
                 }
                 FastGenericDeserializerGeneratorTest_shouldReadSubRecordComplexCollectionsField.put(3, recordsMapArrayUnionOption0);
             } else {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordField_GenericDeserializer_1111917046_1111917046.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordField_GenericDeserializer_1111917046_1111917046.java
index 0f99a572f..fe1678a38 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordField_GenericDeserializer_1111917046_1111917046.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldReadSubRecordField_GenericDeserializer_1111917046_1111917046.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -26,13 +27,13 @@ public FastGenericDeserializerGeneratorTest_shouldReadSubRecordField_GenericDese
         this.field0 = readerSchema.getField("field").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordField0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordField0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordField0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadSubRecordField0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordField;
@@ -47,16 +48,16 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldReadS
             FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.put(0, null);
         } else {
             if (unionIndex0 == 1) {
-                FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.get(0), (decoder)));
+                FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.get(0), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'record': "+ unionIndex0));
             }
         }
-        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordField0((FastGenericDeserializerGeneratorTest_shouldReadSubRecordField), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordField0((FastGenericDeserializerGeneratorTest_shouldReadSubRecordField), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldReadSubRecordField;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -86,10 +87,10 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
         return subRecord;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldReadSubRecordField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldReadSubRecordField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.put(1, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.get(1), (decoder)));
+        FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.put(1, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldReadSubRecordField.get(1), (decoder), (customization)));
         int unionIndex2 = (decoder.readIndex());
         if (unionIndex2 == 0) {
             decoder.readNull();
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedField_GenericDeserializer_1830076637_292632696.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedField_GenericDeserializer_1830076637_292632696.java
index b182d68f0..ab88b8b55 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedField_GenericDeserializer_1830076637_292632696.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedField_GenericDeserializer_1830076637_292632696.java
@@ -2,10 +2,10 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -38,13 +38,13 @@ public FastGenericDeserializerGeneratorTest_shouldSkipRemovedField_GenericDeseri
         this.subRecordArray0 = readerSchema.getField("subRecordArray").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedField0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedField0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedField0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedField0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedField;
@@ -71,13 +71,13 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipR
                 throw new RuntimeException(("Illegal union index for 'testNotRemoved': "+ unionIndex0));
             }
         }
-        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField0((FastGenericDeserializerGeneratorTest_shouldSkipRemovedField), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField1((FastGenericDeserializerGeneratorTest_shouldSkipRemovedField), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField2((FastGenericDeserializerGeneratorTest_shouldSkipRemovedField), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField0((FastGenericDeserializerGeneratorTest_shouldSkipRemovedField), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField1((FastGenericDeserializerGeneratorTest_shouldSkipRemovedField), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField2((FastGenericDeserializerGeneratorTest_shouldSkipRemovedField), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldSkipRemovedField;
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -110,7 +110,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedFiel
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -119,7 +119,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedFiel
             FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.put(2, null);
         } else {
             if (unionIndex3 == 1) {
-                FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.put(2, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.get(2), (decoder)));
+                FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.put(2, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.get(2), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecord': "+ unionIndex3));
             }
@@ -127,31 +127,21 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedFiel
         Map<Utf8, IndexedRecord> subRecordMap1 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, IndexedRecord> subRecordMapReuse0 = null;
-            Object oldMap0 = FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.get(3);
-            if (oldMap0 instanceof Map) {
-                subRecordMapReuse0 = ((Map) oldMap0);
-            }
-            if (subRecordMapReuse0 != (null)) {
-                subRecordMapReuse0 .clear();
-                subRecordMap1 = subRecordMapReuse0;
-            } else {
-                subRecordMap1 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            subRecordMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.get(3), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    subRecordMap1 .put(key0, deserializesubRecord0(null, (decoder)));
+                    subRecordMap1 .put(key0, deserializesubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            subRecordMap1 = new HashMap<Utf8, IndexedRecord>(0);
+            subRecordMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.get(3), 0));
         }
         FastGenericDeserializerGeneratorTest_shouldSkipRemovedField.put(3, subRecordMap1);
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -178,11 +168,11 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
                 throw new RuntimeException(("Illegal union index for 'testNotRemoved': "+ unionIndex4));
             }
         }
-        populate_subRecord0((subRecord), (decoder));
+        populate_subRecord0((subRecord), (customization), (decoder));
         return subRecord;
     }
 
-    private void populate_subRecord0(IndexedRecord subRecord, Decoder decoder)
+    private void populate_subRecord0(IndexedRecord subRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -215,7 +205,7 @@ private void populate_subRecord0(IndexedRecord subRecord, Decoder decoder)
         }
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField2(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedField, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedField2(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedField, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<IndexedRecord> subRecordArray1 = null;
@@ -237,7 +227,7 @@ private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedFiel
                 if (oldArray0 instanceof GenericArray) {
                     subRecordArrayArrayElementReuseVar0 = ((GenericArray) oldArray0).peek();
                 }
-                subRecordArray1 .add(deserializesubRecord0(subRecordArrayArrayElementReuseVar0, (decoder)));
+                subRecordArray1 .add(deserializesubRecord0(subRecordArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen1 = (decoder.arrayNext());
         }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord_GenericDeserializer_1090641932_438987109.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord_GenericDeserializer_1090641932_438987109.java
index a3b080ec2..569f8b259 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord_GenericDeserializer_1090641932_438987109.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord_GenericDeserializer_1090641932_438987109.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord_Generi
         this.subRecord0 = readerSchema.getField("subRecord").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord;
@@ -35,11 +36,11 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipR
         } else {
             FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord = new org.apache.avro.generic.GenericData.Record(readerSchema);
         }
-        FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord.get(0), (decoder)));
+        FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord.get(0), (decoder), (customization)));
         return FastGenericDeserializerGeneratorTest_shouldSkipRemovedNestedRecord;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -56,28 +57,28 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
             charSequence0 = (decoder).readString(null);
         }
         subRecord.put(0, charSequence0);
-        populate_subRecord0((subRecord), (decoder));
-        populate_subRecord1((subRecord), (decoder));
+        populate_subRecord0((subRecord), (customization), (decoder));
+        populate_subRecord1((subRecord), (customization), (decoder));
         return subRecord;
     }
 
-    private void populate_subRecord0(IndexedRecord subRecord, Decoder decoder)
+    private void populate_subRecord0(IndexedRecord subRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        deserializesubSubRecord0(null, (decoder));
+        deserializesubSubRecord0(null, (decoder), (customization));
         int unionIndex0 = (decoder.readIndex());
         if (unionIndex0 == 0) {
             decoder.readNull();
         } else {
             if (unionIndex0 == 1) {
-                deserializesubSubRecord0(null, (decoder));
+                deserializesubSubRecord0(null, (decoder), (customization));
             } else {
                 throw new RuntimeException(("Illegal union index for 'test3': "+ unionIndex0));
             }
         }
     }
 
-    public void deserializesubSubRecord0(Object reuse, Decoder decoder)
+    public void deserializesubSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         decoder.skipString();
@@ -90,7 +91,7 @@ private void populate_subSubRecord0(Decoder decoder)
         decoder.skipString();
     }
 
-    private void populate_subRecord1(IndexedRecord subRecord, Decoder decoder)
+    private void populate_subRecord1(IndexedRecord subRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Utf8 charSequence1;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord_GenericDeserializer_1932590611_1452595291.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord_GenericDeserializer_1932590611_1452595291.java
index 1dbe788a8..c45bcfd33 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord_GenericDeserializer_1932590611_1452595291.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord_GenericDeserializer_1932590611_1452595291.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord_GenericDeser
         this.subRecord10 = readerSchema.getField("subRecord1").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord;
@@ -35,13 +36,13 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldSkipR
         } else {
             FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord = new org.apache.avro.generic.GenericData.Record(readerSchema);
         }
-        FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord.get(0), (decoder)));
-        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord0((FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord), (decoder));
-        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord1((FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord), (decoder));
+        FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord.put(0, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord.get(0), (decoder), (customization)));
+        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord0((FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord), (customization), (decoder));
+        populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord1((FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord), (customization), (decoder));
         return FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -58,11 +59,11 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
             charSequence0 = (decoder).readString(null);
         }
         subRecord.put(0, charSequence0);
-        populate_subRecord0((subRecord), (decoder));
+        populate_subRecord0((subRecord), (customization), (decoder));
         return subRecord;
     }
 
-    private void populate_subRecord0(IndexedRecord subRecord, Decoder decoder)
+    private void populate_subRecord0(IndexedRecord subRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Utf8 charSequence1;
@@ -75,23 +76,23 @@ private void populate_subRecord0(IndexedRecord subRecord, Decoder decoder)
         subRecord.put(1, charSequence1);
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord0(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        deserializesubRecord20(null, (decoder));
+        deserializesubRecord20(null, (decoder), (customization));
         int unionIndex0 = (decoder.readIndex());
         if (unionIndex0 == 0) {
             decoder.readNull();
         } else {
             if (unionIndex0 == 1) {
-                deserializesubRecord20(null, (decoder));
+                deserializesubRecord20(null, (decoder), (customization));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecord3': "+ unionIndex0));
             }
         }
     }
 
-    public void deserializesubRecord20(Object reuse, Decoder decoder)
+    public void deserializesubRecord20(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         decoder.skipString();
@@ -104,10 +105,10 @@ private void populate_subRecord20(Decoder decoder)
         decoder.skipString();
     }
 
-    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord, Decoder decoder)
+    private void populate_FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord1(IndexedRecord FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord.put(1, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord.get(1), (decoder)));
+        FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord.put(1, deserializesubRecord0(FastGenericDeserializerGeneratorTest_shouldSkipRemovedRecord.get(1), (decoder), (customization)));
     }
 
 }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_1186244769_1186244769.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_1186244769_1186244769.java
index 40ce3a8f4..5129b3c99 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_1186244769_1186244769.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_1186244769_1186244769.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroW
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_1186244769_367446918.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_1186244769_367446918.java
index dcbf3aaa9..166a1f7cc 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_1186244769_367446918.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_1186244769_367446918.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroW
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_367446918_1186244769.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_367446918_1186244769.java
index a841e7942..62e405094 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_367446918_1186244769.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_367446918_1186244769.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -21,13 +22,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroW
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_367446918_367446918.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_367446918_367446918.java
index 4adcd2f6a..714ebe8b1 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_367446918_367446918.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType_GenericDeserializer_367446918_367446918.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroW
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateOrFailLikeVanillaAvroWhenTheReaderUnionIsMissingAType;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_1986844009_1986844009.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_1986844009_1986844009.java
index b5db9075a..f7c0fb041 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_1986844009_1986844009.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_1986844009_1986844009.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatInc
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_1986844009_611693319.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_1986844009_611693319.java
index 4bd5a62ec..257628f0c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_1986844009_611693319.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_1986844009_611693319.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatInc
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_611693319_1986844009.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_611693319_1986844009.java
index 3f462b93c..826be95eb 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_611693319_1986844009.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_611693319_1986844009.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatInc
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_611693319_611693319.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_611693319_611693319.java
index 6d0e1eeba..51896b284 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_611693319_611693319.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString_GenericDeserializer_611693319_611693319.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatInc
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingThatIncludeString;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_1778260273_1778260273.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_1778260273_1778260273.java
index b929b35ca..aa9f532e7 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_1778260273_1778260273.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_1778260273_1778260273.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArr
         this.testOptionSchema0 = test0 .getTypes().get(0);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_1778260273_906204958.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_1778260273_906204958.java
index 2ad99bbcf..ddc4b1a1a 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_1778260273_906204958.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_1778260273_906204958.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArr
         this.testOptionSchema0 = test0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_906204958_1778260273.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_906204958_1778260273.java
index c45ea3074..3342fcfce 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_906204958_1778260273.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_906204958_1778260273.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArr
         this.testOptionSchema0 = test0 .getTypes().get(0);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_906204958_906204958.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_906204958_906204958.java
index f7f8ff362..2b7e68c23 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_906204958_906204958.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays_GenericDeserializer_906204958_906204958.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArr
         this.testOptionSchema0 = test0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithArrays;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_2127585735_2127585735.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_2127585735_2127585735.java
index 38eca98bb..59e147551 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_2127585735_2127585735.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_2127585735_2127585735.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMap
         this.testOptionSchema0 = test0 .getTypes().get(0);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps;
@@ -44,17 +44,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
             Map<Utf8, Integer> testOption0 = null;
             long chunkLen0 = (decoder.readMapStart());
             if (chunkLen0 > 0) {
-                Map<Utf8, Integer> testOptionReuse0 = null;
-                Object oldMap0 = FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0);
-                if (oldMap0 instanceof Map) {
-                    testOptionReuse0 = ((Map) oldMap0);
-                }
-                if (testOptionReuse0 != (null)) {
-                    testOptionReuse0 .clear();
-                    testOption0 = testOptionReuse0;
-                } else {
-                    testOption0 = new HashMap<Utf8, Integer>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-                }
+                testOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0), ((int) chunkLen0)));
                 do {
                     for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                         Utf8 key0 = (decoder.readString(null));
@@ -63,7 +53,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
                     chunkLen0 = (decoder.mapNext());
                 } while (chunkLen0 > 0);
             } else {
-                testOption0 = new HashMap<Utf8, Integer>(0);
+                testOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0), 0));
             }
             FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.put(0, testOption0);
         } else {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_2127585735_539246803.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_2127585735_539246803.java
index ab3e738c1..fc12b23ec 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_2127585735_539246803.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_2127585735_539246803.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMap
         this.testOptionSchema0 = test0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps;
@@ -44,17 +44,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
             Map<Utf8, Integer> testOption0 = null;
             long chunkLen0 = (decoder.readMapStart());
             if (chunkLen0 > 0) {
-                Map<Utf8, Integer> testOptionReuse0 = null;
-                Object oldMap0 = FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0);
-                if (oldMap0 instanceof Map) {
-                    testOptionReuse0 = ((Map) oldMap0);
-                }
-                if (testOptionReuse0 != (null)) {
-                    testOptionReuse0 .clear();
-                    testOption0 = testOptionReuse0;
-                } else {
-                    testOption0 = new HashMap<Utf8, Integer>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-                }
+                testOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0), ((int) chunkLen0)));
                 do {
                     for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                         Utf8 key0 = (decoder.readString(null));
@@ -63,7 +53,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
                     chunkLen0 = (decoder.mapNext());
                 } while (chunkLen0 > 0);
             } else {
-                testOption0 = new HashMap<Utf8, Integer>(0);
+                testOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0), 0));
             }
             FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.put(0, testOption0);
         } else {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_539246803_2127585735.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_539246803_2127585735.java
index 24afa6132..5ea9fb9ec 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_539246803_2127585735.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_539246803_2127585735.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMap
         this.testOptionSchema0 = test0 .getTypes().get(0);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps;
@@ -48,17 +48,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
                 Map<Utf8, Integer> testOption0 = null;
                 long chunkLen0 = (decoder.readMapStart());
                 if (chunkLen0 > 0) {
-                    Map<Utf8, Integer> testOptionReuse0 = null;
-                    Object oldMap0 = FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0);
-                    if (oldMap0 instanceof Map) {
-                        testOptionReuse0 = ((Map) oldMap0);
-                    }
-                    if (testOptionReuse0 != (null)) {
-                        testOptionReuse0 .clear();
-                        testOption0 = testOptionReuse0;
-                    } else {
-                        testOption0 = new HashMap<Utf8, Integer>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-                    }
+                    testOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0), ((int) chunkLen0)));
                     do {
                         for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                             Utf8 key0 = (decoder.readString(null));
@@ -67,7 +57,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
                         chunkLen0 = (decoder.mapNext());
                     } while (chunkLen0 > 0);
                 } else {
-                    testOption0 = new HashMap<Utf8, Integer>(0);
+                    testOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0), 0));
                 }
                 FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.put(0, testOption0);
             } else {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_539246803_539246803.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_539246803_539246803.java
index d8f33bee4..802a63b84 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_539246803_539246803.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps_GenericDeserializer_539246803_539246803.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMap
         this.testOptionSchema0 = test0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps;
@@ -48,17 +48,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
                 Map<Utf8, Integer> testOption0 = null;
                 long chunkLen0 = (decoder.readMapStart());
                 if (chunkLen0 > 0) {
-                    Map<Utf8, Integer> testOptionReuse0 = null;
-                    Object oldMap0 = FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0);
-                    if (oldMap0 instanceof Map) {
-                        testOptionReuse0 = ((Map) oldMap0);
-                    }
-                    if (testOptionReuse0 != (null)) {
-                        testOptionReuse0 .clear();
-                        testOption0 = testOptionReuse0;
-                    } else {
-                        testOption0 = new HashMap<Utf8, Integer>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-                    }
+                    testOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0), ((int) chunkLen0)));
                     do {
                         for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                             Utf8 key0 = (decoder.readString(null));
@@ -67,7 +57,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
                         chunkLen0 = (decoder.mapNext());
                     } while (chunkLen0 > 0);
                 } else {
-                    testOption0 = new HashMap<Utf8, Integer>(0);
+                    testOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.get(0), 0));
                 }
                 FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithMaps.put(0, testOption0);
             } else {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_1284646643_1284646643.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_1284646643_1284646643.java
index dc777524f..19109e2d7 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_1284646643_1284646643.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_1284646643_1284646643.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -19,13 +20,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNon
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_1284646643_616931169.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_1284646643_616931169.java
index 59de773cc..19b92e459 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_1284646643_616931169.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_1284646643_616931169.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -19,13 +20,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNon
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_616931169_1284646643.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_616931169_1284646643.java
index 1ad916d09..efafde883 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_616931169_1284646643.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_616931169_1284646643.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -19,13 +20,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNon
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_616931169_616931169.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_616931169_616931169.java
index 619e27298..6836d1841 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_616931169_616931169.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString_GenericDeserializer_616931169_616931169.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -19,13 +20,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNon
         this.test0 = readerSchema.getField("test").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithNonString;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_524692447_524692447.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_524692447_524692447.java
index a80ceb4d9..9611bfd5c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_524692447_524692447.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_524692447_524692447.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -23,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSub
         this.testOptionSchema1 = test0 .getTypes().get(2);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords;
@@ -44,10 +45,10 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
             FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, null);
         } else {
             if (unionIndex0 == 1) {
-                FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord10(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder)));
+                FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord10(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder), (customization)));
             } else {
                 if (unionIndex0 == 2) {
-                    FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord20(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder)));
+                    FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord20(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder), (customization)));
                 } else {
                     throw new RuntimeException(("Illegal union index for 'test': "+ unionIndex0));
                 }
@@ -56,7 +57,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
         return FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords;
     }
 
-    public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord1;
@@ -69,7 +70,7 @@ public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder)
         return subRecord1;
     }
 
-    public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord2;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_524692447_963368136.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_524692447_963368136.java
index 0f3d81197..c68acbf0e 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_524692447_963368136.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_524692447_963368136.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -23,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSub
         this.testOptionSchema1 = test0 .getTypes().get(0);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords;
@@ -44,10 +45,10 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
             FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, null);
         } else {
             if (unionIndex0 == 1) {
-                FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord10(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder)));
+                FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord10(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder), (customization)));
             } else {
                 if (unionIndex0 == 2) {
-                    FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord20(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder)));
+                    FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord20(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder), (customization)));
                 } else {
                     throw new RuntimeException(("Illegal union index for 'test': "+ unionIndex0));
                 }
@@ -56,7 +57,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
         return FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords;
     }
 
-    public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord1;
@@ -69,7 +70,7 @@ public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder)
         return subRecord1;
     }
 
-    public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord2;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_963368136_524692447.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_963368136_524692447.java
index a8492834e..47be388ed 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_963368136_524692447.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_963368136_524692447.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -23,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSub
         this.testOptionSchema1 = test0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords;
@@ -40,10 +41,10 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
         }
         int unionIndex0 = (decoder.readIndex());
         if (unionIndex0 == 0) {
-            FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord20(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder)));
+            FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord20(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder), (customization)));
         } else {
             if (unionIndex0 == 1) {
-                FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord10(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder)));
+                FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord10(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder), (customization)));
             } else {
                 if (unionIndex0 == 2) {
                     decoder.readNull();
@@ -56,7 +57,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
         return FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords;
     }
 
-    public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord2;
@@ -69,7 +70,7 @@ public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder)
         return subRecord2;
     }
 
-    public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord1;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_963368136_963368136.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_963368136_963368136.java
index bcf251fac..f315639a8 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_963368136_963368136.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords_GenericDeserializer_963368136_963368136.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -23,13 +24,13 @@ public FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSub
         this.testOptionSchema1 = test0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0((reuse), (decoder));
+        return deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords;
@@ -40,10 +41,10 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
         }
         int unionIndex0 = (decoder.readIndex());
         if (unionIndex0 == 0) {
-            FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord20(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder)));
+            FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord20(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder), (customization)));
         } else {
             if (unionIndex0 == 1) {
-                FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord10(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder)));
+                FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.put(0, deserializesubRecord10(FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords.get(0), (decoder), (customization)));
             } else {
                 if (unionIndex0 == 2) {
                     decoder.readNull();
@@ -56,7 +57,7 @@ public IndexedRecord deserializeFastGenericDeserializerGeneratorTest_shouldToler
         return FastGenericDeserializerGeneratorTest_shouldTolerateUnionReorderingWithSubRecords;
     }
 
-    public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord2;
@@ -69,7 +70,7 @@ public IndexedRecord deserializesubRecord20(Object reuse, Decoder decoder)
         return subRecord2;
     }
 
-    public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord10(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord1;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesDefined_GenericDeserializer_229156053_229156053.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesDefined_GenericDeserializer_229156053_229156053.java
index 92c7ae145..a48e004e1 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesDefined_GenericDeserializer_229156053_229156053.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesDefined_GenericDeserializer_229156053_229156053.java
@@ -7,6 +7,7 @@
 import java.time.LocalTime;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Conversions;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
@@ -41,13 +42,13 @@ public FastSerdeLogicalTypesDefined_GenericDeserializer_229156053_229156053(Sche
         this.arrayOfUnionOfDateAndTimestampMillisElemOptionSchema1 = arrayOfUnionOfDateAndTimestampMillisArrayElemSchema0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastSerdeLogicalTypesDefined0((reuse), (decoder));
+        return deserializeFastSerdeLogicalTypesDefined0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastSerdeLogicalTypesDefined0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastSerdeLogicalTypesDefined0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastSerdeLogicalTypesDefined;
@@ -58,11 +59,11 @@ public IndexedRecord deserializeFastSerdeLogicalTypesDefined0(Object reuse, Deco
         }
         LocalTime convertedValue0 = ((LocalTime) Conversions.convertToLogicalType((decoder.readInt()), this.logicalTypeSchema__419105534, this.logicalTypeSchema__419105534 .getLogicalType(), this.conversion_time_millis));
         FastSerdeLogicalTypesDefined.put(0, convertedValue0);
-        populate_FastSerdeLogicalTypesDefined0((FastSerdeLogicalTypesDefined), (decoder));
+        populate_FastSerdeLogicalTypesDefined0((FastSerdeLogicalTypesDefined), (customization), (decoder));
         return FastSerdeLogicalTypesDefined;
     }
 
-    private void populate_FastSerdeLogicalTypesDefined0(IndexedRecord FastSerdeLogicalTypesDefined, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesDefined0(IndexedRecord FastSerdeLogicalTypesDefined, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         LocalDate convertedValue1 = ((LocalDate) Conversions.convertToLogicalType((decoder.readInt()), this.logicalTypeSchema__59052268, this.logicalTypeSchema__59052268 .getLogicalType(), this.conversion_date));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesDefined_SpecificDeserializer_229156053_229156053.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesDefined_SpecificDeserializer_229156053_229156053.java
index f2e24de40..c9f0a57c4 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesDefined_SpecificDeserializer_229156053_229156053.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesDefined_SpecificDeserializer_229156053_229156053.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Conversions;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
@@ -29,13 +30,13 @@ public FastSerdeLogicalTypesDefined_SpecificDeserializer_229156053_229156053(Sch
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined deserialize(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined deserialize(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastSerdeLogicalTypesDefined0((reuse), (decoder));
+        return deserializeFastSerdeLogicalTypesDefined0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined deserializeFastSerdeLogicalTypesDefined0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined deserializeFastSerdeLogicalTypesDefined0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined FastSerdeLogicalTypesDefined;
@@ -46,11 +47,11 @@ public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined d
         }
         LocalTime convertedValue0 = ((LocalTime) Conversions.convertToLogicalType((decoder.readInt()), this.logicalTypeSchema__419105534, this.logicalTypeSchema__419105534 .getLogicalType(), this.conversion_time_millis));
         FastSerdeLogicalTypesDefined.put(0, convertedValue0);
-        populate_FastSerdeLogicalTypesDefined0((FastSerdeLogicalTypesDefined), (decoder));
+        populate_FastSerdeLogicalTypesDefined0((FastSerdeLogicalTypesDefined), (customization), (decoder));
         return FastSerdeLogicalTypesDefined;
     }
 
-    private void populate_FastSerdeLogicalTypesDefined0(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined FastSerdeLogicalTypesDefined, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesDefined0(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined FastSerdeLogicalTypesDefined, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         LocalDate convertedValue1 = ((LocalDate) Conversions.convertToLogicalType((decoder.readInt()), this.logicalTypeSchema__59052268, this.logicalTypeSchema__59052268 .getLogicalType(), this.conversion_date));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesTest1_GenericDeserializer_1007574890_1007574890.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesTest1_GenericDeserializer_1007574890_1007574890.java
index 9c4484277..f8e52cbf3 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesTest1_GenericDeserializer_1007574890_1007574890.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesTest1_GenericDeserializer_1007574890_1007574890.java
@@ -8,11 +8,11 @@
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.LocalTime;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Conversions;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -113,13 +113,13 @@ public FastSerdeLogicalTypesTest1_GenericDeserializer_1007574890_1007574890(Sche
         this.unionOfDateAndLocalTimestampOptionSchema1 = unionOfDateAndLocalTimestamp0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastSerdeLogicalTypesTest10((reuse), (decoder));
+        return deserializeFastSerdeLogicalTypesTest10((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastSerdeLogicalTypesTest10(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastSerdeLogicalTypesTest10(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastSerdeLogicalTypesTest1;
@@ -152,17 +152,7 @@ public IndexedRecord deserializeFastSerdeLogicalTypesTest10(Object reuse, Decode
                 Map<Utf8, LocalDate> unionOfArrayAndMapOption1 = null;
                 long chunkLen1 = (decoder.readMapStart());
                 if (chunkLen1 > 0) {
-                    Map<Utf8, LocalDate> unionOfArrayAndMapOptionReuse0 = null;
-                    Object oldMap0 = FastSerdeLogicalTypesTest1 .get(0);
-                    if (oldMap0 instanceof Map) {
-                        unionOfArrayAndMapOptionReuse0 = ((Map) oldMap0);
-                    }
-                    if (unionOfArrayAndMapOptionReuse0 != (null)) {
-                        unionOfArrayAndMapOptionReuse0 .clear();
-                        unionOfArrayAndMapOption1 = unionOfArrayAndMapOptionReuse0;
-                    } else {
-                        unionOfArrayAndMapOption1 = new HashMap<Utf8, LocalDate>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-                    }
+                    unionOfArrayAndMapOption1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(0), ((int) chunkLen1)));
                     do {
                         for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                             Utf8 key0 = (decoder.readString(null));
@@ -172,39 +162,29 @@ public IndexedRecord deserializeFastSerdeLogicalTypesTest10(Object reuse, Decode
                         chunkLen1 = (decoder.mapNext());
                     } while (chunkLen1 > 0);
                 } else {
-                    unionOfArrayAndMapOption1 = new HashMap<Utf8, LocalDate>(0);
+                    unionOfArrayAndMapOption1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(0), 0));
                 }
                 FastSerdeLogicalTypesTest1 .put(0, unionOfArrayAndMapOption1);
             } else {
                 throw new RuntimeException(("Illegal union index for 'unionOfArrayAndMap': "+ unionIndex0));
             }
         }
-        populate_FastSerdeLogicalTypesTest10((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest11((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest12((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest13((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest14((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest15((FastSerdeLogicalTypesTest1), (decoder));
+        populate_FastSerdeLogicalTypesTest10((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest11((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest12((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest13((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest14((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest15((FastSerdeLogicalTypesTest1), (customization), (decoder));
         return FastSerdeLogicalTypesTest1;
     }
 
-    private void populate_FastSerdeLogicalTypesTest10(IndexedRecord FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest10(IndexedRecord FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, Object> mapOfUnionsOfDateAndTimestampMillis1 = null;
         long chunkLen2 = (decoder.readMapStart());
         if (chunkLen2 > 0) {
-            Map<Utf8, Object> mapOfUnionsOfDateAndTimestampMillisReuse0 = null;
-            Object oldMap1 = FastSerdeLogicalTypesTest1 .get(1);
-            if (oldMap1 instanceof Map) {
-                mapOfUnionsOfDateAndTimestampMillisReuse0 = ((Map) oldMap1);
-            }
-            if (mapOfUnionsOfDateAndTimestampMillisReuse0 != (null)) {
-                mapOfUnionsOfDateAndTimestampMillisReuse0 .clear();
-                mapOfUnionsOfDateAndTimestampMillis1 = mapOfUnionsOfDateAndTimestampMillisReuse0;
-            } else {
-                mapOfUnionsOfDateAndTimestampMillis1 = new HashMap<Utf8, Object>(((int)(((chunkLen2 * 4)+ 2)/ 3)));
-            }
+            mapOfUnionsOfDateAndTimestampMillis1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(1), ((int) chunkLen2)));
             do {
                 for (int counter2 = 0; (counter2 <chunkLen2); counter2 ++) {
                     Utf8 key1 = (decoder.readString(null));
@@ -224,23 +204,13 @@ private void populate_FastSerdeLogicalTypesTest10(IndexedRecord FastSerdeLogical
                 chunkLen2 = (decoder.mapNext());
             } while (chunkLen2 > 0);
         } else {
-            mapOfUnionsOfDateAndTimestampMillis1 = new HashMap<Utf8, Object>(0);
+            mapOfUnionsOfDateAndTimestampMillis1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(1), 0));
         }
         FastSerdeLogicalTypesTest1 .put(1, mapOfUnionsOfDateAndTimestampMillis1);
         Map<Utf8, Instant> timestampMillisMap1 = null;
         long chunkLen3 = (decoder.readMapStart());
         if (chunkLen3 > 0) {
-            Map<Utf8, Instant> timestampMillisMapReuse0 = null;
-            Object oldMap2 = FastSerdeLogicalTypesTest1 .get(2);
-            if (oldMap2 instanceof Map) {
-                timestampMillisMapReuse0 = ((Map) oldMap2);
-            }
-            if (timestampMillisMapReuse0 != (null)) {
-                timestampMillisMapReuse0 .clear();
-                timestampMillisMap1 = timestampMillisMapReuse0;
-            } else {
-                timestampMillisMap1 = new HashMap<Utf8, Instant>(((int)(((chunkLen3 * 4)+ 2)/ 3)));
-            }
+            timestampMillisMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(2), ((int) chunkLen3)));
             do {
                 for (int counter3 = 0; (counter3 <chunkLen3); counter3 ++) {
                     Utf8 key2 = (decoder.readString(null));
@@ -250,12 +220,12 @@ private void populate_FastSerdeLogicalTypesTest10(IndexedRecord FastSerdeLogical
                 chunkLen3 = (decoder.mapNext());
             } while (chunkLen3 > 0);
         } else {
-            timestampMillisMap1 = new HashMap<Utf8, Instant>(0);
+            timestampMillisMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(2), 0));
         }
         FastSerdeLogicalTypesTest1 .put(2, timestampMillisMap1);
     }
 
-    private void populate_FastSerdeLogicalTypesTest11(IndexedRecord FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest11(IndexedRecord FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -304,7 +274,7 @@ private void populate_FastSerdeLogicalTypesTest11(IndexedRecord FastSerdeLogical
         FastSerdeLogicalTypesTest1 .put(4, arrayOfDates0);
     }
 
-    private void populate_FastSerdeLogicalTypesTest12(IndexedRecord FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest12(IndexedRecord FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -337,7 +307,7 @@ private void populate_FastSerdeLogicalTypesTest12(IndexedRecord FastSerdeLogical
         FastSerdeLogicalTypesTest1 .put(6, convertedValue9);
     }
 
-    private void populate_FastSerdeLogicalTypesTest13(IndexedRecord FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest13(IndexedRecord FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Instant convertedValue10 = ((Instant) Conversions.convertToLogicalType((decoder.readLong()), this.logicalTypeSchema_1074306973, this.logicalTypeSchema_1074306973 .getLogicalType(), this.conversion_timestamp_millis));
@@ -346,7 +316,7 @@ private void populate_FastSerdeLogicalTypesTest13(IndexedRecord FastSerdeLogical
         FastSerdeLogicalTypesTest1 .put(8, convertedValue11);
     }
 
-    private void populate_FastSerdeLogicalTypesTest14(IndexedRecord FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest14(IndexedRecord FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         LocalTime convertedValue12 = ((LocalTime) Conversions.convertToLogicalType((decoder.readInt()), this.logicalTypeSchema__419105534, this.logicalTypeSchema__419105534 .getLogicalType(), this.conversion_time_millis));
@@ -355,15 +325,15 @@ private void populate_FastSerdeLogicalTypesTest14(IndexedRecord FastSerdeLogical
         FastSerdeLogicalTypesTest1 .put(10, convertedValue13);
     }
 
-    private void populate_FastSerdeLogicalTypesTest15(IndexedRecord FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest15(IndexedRecord FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         LocalDate convertedValue14 = ((LocalDate) Conversions.convertToLogicalType((decoder.readInt()), this.logicalTypeSchema__59052268, this.logicalTypeSchema__59052268 .getLogicalType(), this.conversion_date));
         FastSerdeLogicalTypesTest1 .put(11, convertedValue14);
-        FastSerdeLogicalTypesTest1 .put(12, deserializeLocalTimestampRecord0(FastSerdeLogicalTypesTest1 .get(12), (decoder)));
+        FastSerdeLogicalTypesTest1 .put(12, deserializeLocalTimestampRecord0(FastSerdeLogicalTypesTest1 .get(12), (decoder), (customization)));
     }
 
-    public IndexedRecord deserializeLocalTimestampRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeLocalTimestampRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord LocalTimestampRecord;
@@ -374,12 +344,12 @@ public IndexedRecord deserializeLocalTimestampRecord0(Object reuse, Decoder deco
         }
         LocalDateTime convertedValue15 = ((LocalDateTime) Conversions.convertToLogicalType((decoder.readLong()), this.logicalTypeSchema__250645780, this.logicalTypeSchema__250645780 .getLogicalType(), this.conversion_local_timestamp_millis));
         LocalTimestampRecord.put(0, convertedValue15);
-        populate_LocalTimestampRecord0((LocalTimestampRecord), (decoder));
-        populate_LocalTimestampRecord1((LocalTimestampRecord), (decoder));
+        populate_LocalTimestampRecord0((LocalTimestampRecord), (customization), (decoder));
+        populate_LocalTimestampRecord1((LocalTimestampRecord), (customization), (decoder));
         return LocalTimestampRecord;
     }
 
-    private void populate_LocalTimestampRecord0(IndexedRecord LocalTimestampRecord, Decoder decoder)
+    private void populate_LocalTimestampRecord0(IndexedRecord LocalTimestampRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -413,7 +383,7 @@ private void populate_LocalTimestampRecord0(IndexedRecord LocalTimestampRecord,
         }
     }
 
-    private void populate_LocalTimestampRecord1(IndexedRecord LocalTimestampRecord, Decoder decoder)
+    private void populate_LocalTimestampRecord1(IndexedRecord LocalTimestampRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesTest1_SpecificDeserializer_1007574890_1007574890.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesTest1_SpecificDeserializer_1007574890_1007574890.java
index 6a1f80d32..4bc87b99f 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesTest1_SpecificDeserializer_1007574890_1007574890.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesTest1_SpecificDeserializer_1007574890_1007574890.java
@@ -9,11 +9,11 @@
 import java.time.LocalDateTime;
 import java.time.LocalTime;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Conversions;
 import org.apache.avro.Schema;
 import org.apache.avro.io.Decoder;
@@ -45,13 +45,13 @@ public FastSerdeLogicalTypesTest1_SpecificDeserializer_1007574890_1007574890(Sch
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 deserialize(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 deserialize(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastSerdeLogicalTypesTest10((reuse), (decoder));
+        return deserializeFastSerdeLogicalTypesTest10((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 deserializeFastSerdeLogicalTypesTest10(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 deserializeFastSerdeLogicalTypesTest10(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1;
@@ -84,17 +84,7 @@ public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 des
                 Map<Utf8, LocalDate> unionOfArrayAndMapOption1 = null;
                 long chunkLen1 = (decoder.readMapStart());
                 if (chunkLen1 > 0) {
-                    Map<Utf8, LocalDate> unionOfArrayAndMapOptionReuse0 = null;
-                    Object oldMap0 = FastSerdeLogicalTypesTest1 .get(0);
-                    if (oldMap0 instanceof Map) {
-                        unionOfArrayAndMapOptionReuse0 = ((Map) oldMap0);
-                    }
-                    if (unionOfArrayAndMapOptionReuse0 != (null)) {
-                        unionOfArrayAndMapOptionReuse0 .clear();
-                        unionOfArrayAndMapOption1 = unionOfArrayAndMapOptionReuse0;
-                    } else {
-                        unionOfArrayAndMapOption1 = new HashMap<Utf8, LocalDate>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-                    }
+                    unionOfArrayAndMapOption1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(0), ((int) chunkLen1)));
                     do {
                         for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                             Utf8 key0 = (decoder.readString(null));
@@ -104,39 +94,29 @@ public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 des
                         chunkLen1 = (decoder.mapNext());
                     } while (chunkLen1 > 0);
                 } else {
-                    unionOfArrayAndMapOption1 = new HashMap<Utf8, LocalDate>(0);
+                    unionOfArrayAndMapOption1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(0), 0));
                 }
                 FastSerdeLogicalTypesTest1 .put(0, unionOfArrayAndMapOption1);
             } else {
                 throw new RuntimeException(("Illegal union index for 'unionOfArrayAndMap': "+ unionIndex0));
             }
         }
-        populate_FastSerdeLogicalTypesTest10((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest11((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest12((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest13((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest14((FastSerdeLogicalTypesTest1), (decoder));
-        populate_FastSerdeLogicalTypesTest15((FastSerdeLogicalTypesTest1), (decoder));
+        populate_FastSerdeLogicalTypesTest10((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest11((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest12((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest13((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest14((FastSerdeLogicalTypesTest1), (customization), (decoder));
+        populate_FastSerdeLogicalTypesTest15((FastSerdeLogicalTypesTest1), (customization), (decoder));
         return FastSerdeLogicalTypesTest1;
     }
 
-    private void populate_FastSerdeLogicalTypesTest10(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest10(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, Object> mapOfUnionsOfDateAndTimestampMillis0 = null;
         long chunkLen2 = (decoder.readMapStart());
         if (chunkLen2 > 0) {
-            Map<Utf8, Object> mapOfUnionsOfDateAndTimestampMillisReuse0 = null;
-            Object oldMap1 = FastSerdeLogicalTypesTest1 .get(1);
-            if (oldMap1 instanceof Map) {
-                mapOfUnionsOfDateAndTimestampMillisReuse0 = ((Map) oldMap1);
-            }
-            if (mapOfUnionsOfDateAndTimestampMillisReuse0 != (null)) {
-                mapOfUnionsOfDateAndTimestampMillisReuse0 .clear();
-                mapOfUnionsOfDateAndTimestampMillis0 = mapOfUnionsOfDateAndTimestampMillisReuse0;
-            } else {
-                mapOfUnionsOfDateAndTimestampMillis0 = new HashMap<Utf8, Object>(((int)(((chunkLen2 * 4)+ 2)/ 3)));
-            }
+            mapOfUnionsOfDateAndTimestampMillis0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(1), ((int) chunkLen2)));
             do {
                 for (int counter2 = 0; (counter2 <chunkLen2); counter2 ++) {
                     Utf8 key1 = (decoder.readString(null));
@@ -156,23 +136,13 @@ private void populate_FastSerdeLogicalTypesTest10(com.linkedin.avro.fastserde.ge
                 chunkLen2 = (decoder.mapNext());
             } while (chunkLen2 > 0);
         } else {
-            mapOfUnionsOfDateAndTimestampMillis0 = new HashMap<Utf8, Object>(0);
+            mapOfUnionsOfDateAndTimestampMillis0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(1), 0));
         }
         FastSerdeLogicalTypesTest1 .put(1, mapOfUnionsOfDateAndTimestampMillis0);
         Map<Utf8, Instant> timestampMillisMap0 = null;
         long chunkLen3 = (decoder.readMapStart());
         if (chunkLen3 > 0) {
-            Map<Utf8, Instant> timestampMillisMapReuse0 = null;
-            Object oldMap2 = FastSerdeLogicalTypesTest1 .get(2);
-            if (oldMap2 instanceof Map) {
-                timestampMillisMapReuse0 = ((Map) oldMap2);
-            }
-            if (timestampMillisMapReuse0 != (null)) {
-                timestampMillisMapReuse0 .clear();
-                timestampMillisMap0 = timestampMillisMapReuse0;
-            } else {
-                timestampMillisMap0 = new HashMap<Utf8, Instant>(((int)(((chunkLen3 * 4)+ 2)/ 3)));
-            }
+            timestampMillisMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(2), ((int) chunkLen3)));
             do {
                 for (int counter3 = 0; (counter3 <chunkLen3); counter3 ++) {
                     Utf8 key2 = (decoder.readString(null));
@@ -182,12 +152,12 @@ private void populate_FastSerdeLogicalTypesTest10(com.linkedin.avro.fastserde.ge
                 chunkLen3 = (decoder.mapNext());
             } while (chunkLen3 > 0);
         } else {
-            timestampMillisMap0 = new HashMap<Utf8, Instant>(0);
+            timestampMillisMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(FastSerdeLogicalTypesTest1 .get(2), 0));
         }
         FastSerdeLogicalTypesTest1 .put(2, timestampMillisMap0);
     }
 
-    private void populate_FastSerdeLogicalTypesTest11(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest11(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -236,7 +206,7 @@ private void populate_FastSerdeLogicalTypesTest11(com.linkedin.avro.fastserde.ge
         FastSerdeLogicalTypesTest1 .put(4, arrayOfDates0);
     }
 
-    private void populate_FastSerdeLogicalTypesTest12(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest12(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -269,7 +239,7 @@ private void populate_FastSerdeLogicalTypesTest12(com.linkedin.avro.fastserde.ge
         FastSerdeLogicalTypesTest1 .put(6, convertedValue9);
     }
 
-    private void populate_FastSerdeLogicalTypesTest13(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest13(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Instant convertedValue10 = ((Instant) Conversions.convertToLogicalType((decoder.readLong()), this.logicalTypeSchema_1074306973, this.logicalTypeSchema_1074306973 .getLogicalType(), this.conversion_timestamp_millis));
@@ -278,7 +248,7 @@ private void populate_FastSerdeLogicalTypesTest13(com.linkedin.avro.fastserde.ge
         FastSerdeLogicalTypesTest1 .put(8, convertedValue11);
     }
 
-    private void populate_FastSerdeLogicalTypesTest14(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest14(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         LocalTime convertedValue12 = ((LocalTime) Conversions.convertToLogicalType((decoder.readInt()), this.logicalTypeSchema__419105534, this.logicalTypeSchema__419105534 .getLogicalType(), this.conversion_time_millis));
@@ -287,15 +257,15 @@ private void populate_FastSerdeLogicalTypesTest14(com.linkedin.avro.fastserde.ge
         FastSerdeLogicalTypesTest1 .put(10, convertedValue13);
     }
 
-    private void populate_FastSerdeLogicalTypesTest15(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesTest15(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1 FastSerdeLogicalTypesTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         LocalDate convertedValue14 = ((LocalDate) Conversions.convertToLogicalType((decoder.readInt()), this.logicalTypeSchema__59052268, this.logicalTypeSchema__59052268 .getLogicalType(), this.conversion_date));
         FastSerdeLogicalTypesTest1 .put(11, convertedValue14);
-        FastSerdeLogicalTypesTest1 .put(12, deserializeLocalTimestampRecord0(FastSerdeLogicalTypesTest1 .get(12), (decoder)));
+        FastSerdeLogicalTypesTest1 .put(12, deserializeLocalTimestampRecord0(FastSerdeLogicalTypesTest1 .get(12), (decoder), (customization)));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord deserializeLocalTimestampRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord deserializeLocalTimestampRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord LocalTimestampRecord;
@@ -306,12 +276,12 @@ public com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord deseriali
         }
         LocalDateTime convertedValue15 = ((LocalDateTime) Conversions.convertToLogicalType((decoder.readLong()), this.logicalTypeSchema__250645780, this.logicalTypeSchema__250645780 .getLogicalType(), this.conversion_local_timestamp_millis));
         LocalTimestampRecord.put(0, convertedValue15);
-        populate_LocalTimestampRecord0((LocalTimestampRecord), (decoder));
-        populate_LocalTimestampRecord1((LocalTimestampRecord), (decoder));
+        populate_LocalTimestampRecord0((LocalTimestampRecord), (customization), (decoder));
+        populate_LocalTimestampRecord1((LocalTimestampRecord), (customization), (decoder));
         return LocalTimestampRecord;
     }
 
-    private void populate_LocalTimestampRecord0(com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord LocalTimestampRecord, Decoder decoder)
+    private void populate_LocalTimestampRecord0(com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord LocalTimestampRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -345,7 +315,7 @@ private void populate_LocalTimestampRecord0(com.linkedin.avro.fastserde.generate
         }
     }
 
-    private void populate_LocalTimestampRecord1(com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord LocalTimestampRecord, Decoder decoder)
+    private void populate_LocalTimestampRecord1(com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord LocalTimestampRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_GenericDeserializer_1982763418_1982763418.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_GenericDeserializer_1982763418_1982763418.java
index 563d4cdad..039dee255 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_GenericDeserializer_1982763418_1982763418.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_GenericDeserializer_1982763418_1982763418.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,13 +24,13 @@ public FastSerdeLogicalTypesUndefined_GenericDeserializer_1982763418_1982763418(
         this.arrayOfUnionOfDateAndTimestampMillisArrayElemSchema0 = arrayOfUnionOfDateAndTimestampMillis0 .getElementType();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastSerdeLogicalTypesUndefined0((reuse), (decoder));
+        return deserializeFastSerdeLogicalTypesUndefined0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastSerdeLogicalTypesUndefined0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastSerdeLogicalTypesUndefined0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastSerdeLogicalTypesUndefined;
@@ -39,11 +40,11 @@ public IndexedRecord deserializeFastSerdeLogicalTypesUndefined0(Object reuse, De
             FastSerdeLogicalTypesUndefined = new org.apache.avro.generic.GenericData.Record(readerSchema);
         }
         FastSerdeLogicalTypesUndefined.put(0, (decoder.readInt()));
-        populate_FastSerdeLogicalTypesUndefined0((FastSerdeLogicalTypesUndefined), (decoder));
+        populate_FastSerdeLogicalTypesUndefined0((FastSerdeLogicalTypesUndefined), (customization), (decoder));
         return FastSerdeLogicalTypesUndefined;
     }
 
-    private void populate_FastSerdeLogicalTypesUndefined0(IndexedRecord FastSerdeLogicalTypesUndefined, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesUndefined0(IndexedRecord FastSerdeLogicalTypesUndefined, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         FastSerdeLogicalTypesUndefined.put(1, (decoder.readInt()));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_SpecificDeserializer_1982763418_1982763418.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_SpecificDeserializer_1982763418_1982763418.java
index b386cfaa2..ff87b06cf 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_SpecificDeserializer_1982763418_1982763418.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_SpecificDeserializer_1982763418_1982763418.java
@@ -5,6 +5,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.io.Decoder;
@@ -19,13 +20,13 @@ public FastSerdeLogicalTypesUndefined_SpecificDeserializer_1982763418_1982763418
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined deserialize(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined deserialize(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastSerdeLogicalTypesUndefined0((reuse), (decoder));
+        return deserializeFastSerdeLogicalTypesUndefined0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined deserializeFastSerdeLogicalTypesUndefined0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined deserializeFastSerdeLogicalTypesUndefined0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined FastSerdeLogicalTypesUndefined;
@@ -35,11 +36,11 @@ public com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined
             FastSerdeLogicalTypesUndefined = new com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined();
         }
         FastSerdeLogicalTypesUndefined.put(0, (decoder.readInt()));
-        populate_FastSerdeLogicalTypesUndefined0((FastSerdeLogicalTypesUndefined), (decoder));
+        populate_FastSerdeLogicalTypesUndefined0((FastSerdeLogicalTypesUndefined), (customization), (decoder));
         return FastSerdeLogicalTypesUndefined;
     }
 
-    private void populate_FastSerdeLogicalTypesUndefined0(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined FastSerdeLogicalTypesUndefined, Decoder decoder)
+    private void populate_FastSerdeLogicalTypesUndefined0(com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined FastSerdeLogicalTypesUndefined, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         FastSerdeLogicalTypesUndefined.put(1, (decoder.readInt()));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializer_205569_205569.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializer_205569_205569.java
index f9c9f4cec..8999c9e47 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializer_205569_205569.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializer_205569_205569.java
@@ -2,10 +2,10 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -28,13 +28,13 @@ public FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializ
         this.testStringMap0 = readerSchema.getField("testStringMap").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastStringableTest_javaStringPropertyInReaderSchemaTest0((reuse), (decoder));
+        return deserializeFastStringableTest_javaStringPropertyInReaderSchemaTest0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest;
@@ -51,12 +51,12 @@ public IndexedRecord deserializeFastStringableTest_javaStringPropertyInReaderSch
             charSequence0 = (decoder).readString(null);
         }
         FastStringableTest_javaStringPropertyInReaderSchemaTest.put(0, charSequence0);
-        populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0((FastStringableTest_javaStringPropertyInReaderSchemaTest), (decoder));
-        populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1((FastStringableTest_javaStringPropertyInReaderSchemaTest), (decoder));
+        populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0((FastStringableTest_javaStringPropertyInReaderSchemaTest), (customization), (decoder));
+        populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1((FastStringableTest_javaStringPropertyInReaderSchemaTest), (customization), (decoder));
         return FastStringableTest_javaStringPropertyInReaderSchemaTest;
     }
 
-    private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0(IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest, Decoder decoder)
+    private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0(IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -109,23 +109,13 @@ private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0(I
         FastStringableTest_javaStringPropertyInReaderSchemaTest.put(2, testStringArray1);
     }
 
-    private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1(IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest, Decoder decoder)
+    private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1(IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, Utf8> testStringMap1 = null;
         long chunkLen1 = (decoder.readMapStart());
         if (chunkLen1 > 0) {
-            Map<Utf8, Utf8> testStringMapReuse0 = null;
-            Object oldMap0 = FastStringableTest_javaStringPropertyInReaderSchemaTest.get(3);
-            if (oldMap0 instanceof Map) {
-                testStringMapReuse0 = ((Map) oldMap0);
-            }
-            if (testStringMapReuse0 != (null)) {
-                testStringMapReuse0 .clear();
-                testStringMap1 = testStringMapReuse0;
-            } else {
-                testStringMap1 = new HashMap<Utf8, Utf8>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-            }
+            testStringMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastStringableTest_javaStringPropertyInReaderSchemaTest.get(3), ((int) chunkLen1)));
             do {
                 for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                     Utf8 key0 = (decoder.readString(null));
@@ -135,7 +125,7 @@ private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1(I
                 chunkLen1 = (decoder.mapNext());
             } while (chunkLen1 > 0);
         } else {
-            testStringMap1 = new HashMap<Utf8, Utf8>(0);
+            testStringMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastStringableTest_javaStringPropertyInReaderSchemaTest.get(3), 0));
         }
         FastStringableTest_javaStringPropertyInReaderSchemaTest.put(3, testStringMap1);
     }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializer_205569_941602558.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializer_205569_941602558.java
index 15d30a747..ee5007f4a 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializer_205569_941602558.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializer_205569_941602558.java
@@ -2,10 +2,10 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -27,13 +27,13 @@ public FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericDeserializ
         this.testStringMap0 = readerSchema.getField("testStringMap").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastStringableTest_javaStringPropertyInReaderSchemaTest0((reuse), (decoder));
+        return deserializeFastStringableTest_javaStringPropertyInReaderSchemaTest0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest;
@@ -44,12 +44,12 @@ public IndexedRecord deserializeFastStringableTest_javaStringPropertyInReaderSch
         }
         String charSequence0 = (decoder).readString();
         FastStringableTest_javaStringPropertyInReaderSchemaTest.put(0, charSequence0);
-        populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0((FastStringableTest_javaStringPropertyInReaderSchemaTest), (decoder));
-        populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1((FastStringableTest_javaStringPropertyInReaderSchemaTest), (decoder));
+        populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0((FastStringableTest_javaStringPropertyInReaderSchemaTest), (customization), (decoder));
+        populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1((FastStringableTest_javaStringPropertyInReaderSchemaTest), (customization), (decoder));
         return FastStringableTest_javaStringPropertyInReaderSchemaTest;
     }
 
-    private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0(IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest, Decoder decoder)
+    private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0(IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -91,23 +91,13 @@ private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest0(I
         FastStringableTest_javaStringPropertyInReaderSchemaTest.put(2, testStringArray1);
     }
 
-    private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1(IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest, Decoder decoder)
+    private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1(IndexedRecord FastStringableTest_javaStringPropertyInReaderSchemaTest, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<String, String> testStringMap1 = null;
         long chunkLen1 = (decoder.readMapStart());
         if (chunkLen1 > 0) {
-            Map<String, String> testStringMapReuse0 = null;
-            Object oldMap0 = FastStringableTest_javaStringPropertyInReaderSchemaTest.get(3);
-            if (oldMap0 instanceof Map) {
-                testStringMapReuse0 = ((Map) oldMap0);
-            }
-            if (testStringMapReuse0 != (null)) {
-                testStringMapReuse0 .clear();
-                testStringMap1 = testStringMapReuse0;
-            } else {
-                testStringMap1 = new HashMap<String, String>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-            }
+            testStringMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastStringableTest_javaStringPropertyInReaderSchemaTest.get(3), ((int) chunkLen1)));
             do {
                 for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                     String key0 = (decoder.readString());
@@ -117,7 +107,7 @@ private void populate_FastStringableTest_javaStringPropertyInReaderSchemaTest1(I
                 chunkLen1 = (decoder.mapNext());
             } while (chunkLen1 > 0);
         } else {
-            testStringMap1 = new HashMap<String, String>(0);
+            testStringMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastStringableTest_javaStringPropertyInReaderSchemaTest.get(3), 0));
         }
         FastStringableTest_javaStringPropertyInReaderSchemaTest.put(3, testStringMap1);
     }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyTest_GenericDeserializer_1110978985_1110978985.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyTest_GenericDeserializer_1110978985_1110978985.java
index ee0490bf6..6e5581336 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyTest_GenericDeserializer_1110978985_1110978985.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/FastStringableTest_javaStringPropertyTest_GenericDeserializer_1110978985_1110978985.java
@@ -2,10 +2,10 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -27,13 +27,13 @@ public FastStringableTest_javaStringPropertyTest_GenericDeserializer_1110978985_
         this.testStringMap0 = readerSchema.getField("testStringMap").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeFastStringableTest_javaStringPropertyTest0((reuse), (decoder));
+        return deserializeFastStringableTest_javaStringPropertyTest0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeFastStringableTest_javaStringPropertyTest0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeFastStringableTest_javaStringPropertyTest0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord FastStringableTest_javaStringPropertyTest;
@@ -44,12 +44,12 @@ public IndexedRecord deserializeFastStringableTest_javaStringPropertyTest0(Objec
         }
         String charSequence0 = (decoder).readString();
         FastStringableTest_javaStringPropertyTest.put(0, charSequence0);
-        populate_FastStringableTest_javaStringPropertyTest0((FastStringableTest_javaStringPropertyTest), (decoder));
-        populate_FastStringableTest_javaStringPropertyTest1((FastStringableTest_javaStringPropertyTest), (decoder));
+        populate_FastStringableTest_javaStringPropertyTest0((FastStringableTest_javaStringPropertyTest), (customization), (decoder));
+        populate_FastStringableTest_javaStringPropertyTest1((FastStringableTest_javaStringPropertyTest), (customization), (decoder));
         return FastStringableTest_javaStringPropertyTest;
     }
 
-    private void populate_FastStringableTest_javaStringPropertyTest0(IndexedRecord FastStringableTest_javaStringPropertyTest, Decoder decoder)
+    private void populate_FastStringableTest_javaStringPropertyTest0(IndexedRecord FastStringableTest_javaStringPropertyTest, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -91,23 +91,13 @@ private void populate_FastStringableTest_javaStringPropertyTest0(IndexedRecord F
         FastStringableTest_javaStringPropertyTest.put(2, testStringArray1);
     }
 
-    private void populate_FastStringableTest_javaStringPropertyTest1(IndexedRecord FastStringableTest_javaStringPropertyTest, Decoder decoder)
+    private void populate_FastStringableTest_javaStringPropertyTest1(IndexedRecord FastStringableTest_javaStringPropertyTest, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<String, String> testStringMap1 = null;
         long chunkLen1 = (decoder.readMapStart());
         if (chunkLen1 > 0) {
-            Map<String, String> testStringMapReuse0 = null;
-            Object oldMap0 = FastStringableTest_javaStringPropertyTest.get(3);
-            if (oldMap0 instanceof Map) {
-                testStringMapReuse0 = ((Map) oldMap0);
-            }
-            if (testStringMapReuse0 != (null)) {
-                testStringMapReuse0 .clear();
-                testStringMap1 = testStringMapReuse0;
-            } else {
-                testStringMap1 = new HashMap<String, String>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-            }
+            testStringMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastStringableTest_javaStringPropertyTest.get(3), ((int) chunkLen1)));
             do {
                 for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                     String key0 = (decoder.readString());
@@ -117,7 +107,7 @@ private void populate_FastStringableTest_javaStringPropertyTest1(IndexedRecord F
                 chunkLen1 = (decoder.mapNext());
             } while (chunkLen1 > 0);
         } else {
-            testStringMap1 = new HashMap<String, String>(0);
+            testStringMap1 = ((Map)(customization).getNewMapOverrideFunc().apply(FastStringableTest_javaStringPropertyTest.get(3), 0));
         }
         FastStringableTest_javaStringPropertyTest.put(3, testStringMap1);
     }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_TestRecord_SpecificDeserializer_1100791978_1100791978.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_TestRecord_SpecificDeserializer_1100791978_1100791978.java
index 3e4b13f88..b96d4fbf0 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_TestRecord_SpecificDeserializer_1100791978_1100791978.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_TestRecord_SpecificDeserializer_1100791978_1100791978.java
@@ -4,7 +4,6 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.api.PrimitiveBooleanList;
@@ -14,6 +13,7 @@
 import com.linkedin.avro.api.PrimitiveLongList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestFixed;
 import com.linkedin.avro.fastserde.primitive.PrimitiveBooleanArrayList;
@@ -37,36 +37,27 @@ public Map_of_TestRecord_SpecificDeserializer_1100791978_1100791978(Schema reade
         this.readerSchema = readerSchema;
     }
 
-    public Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> reuse, Decoder decoder)
+    public Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> map0 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> mapReuse0 = null;
-            if ((reuse) instanceof Map) {
-                mapReuse0 = ((Map)(reuse));
-            }
-            if (mapReuse0 != (null)) {
-                mapReuse0 .clear();
-                map0 = mapReuse0;
-            } else {
-                map0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    map0 .put(key0, deserializeTestRecord0(null, (decoder)));
+                    map0 .put(key0, deserializeTestRecord0(null, (decoder), (customization)));
                 }
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            map0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord>(0);
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), 0));
         }
         return map0;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord;
@@ -76,29 +67,29 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
             TestRecord = new com.linkedin.avro.fastserde.generated.avro.TestRecord();
         }
         TestRecord.put(0, (decoder.readInt()));
-        populate_TestRecord0((TestRecord), (decoder));
-        populate_TestRecord1((TestRecord), (decoder));
-        populate_TestRecord2((TestRecord), (decoder));
-        populate_TestRecord3((TestRecord), (decoder));
-        populate_TestRecord4((TestRecord), (decoder));
-        populate_TestRecord5((TestRecord), (decoder));
-        populate_TestRecord6((TestRecord), (decoder));
-        populate_TestRecord7((TestRecord), (decoder));
-        populate_TestRecord8((TestRecord), (decoder));
-        populate_TestRecord9((TestRecord), (decoder));
-        populate_TestRecord10((TestRecord), (decoder));
-        populate_TestRecord11((TestRecord), (decoder));
-        populate_TestRecord12((TestRecord), (decoder));
-        populate_TestRecord13((TestRecord), (decoder));
-        populate_TestRecord14((TestRecord), (decoder));
-        populate_TestRecord15((TestRecord), (decoder));
-        populate_TestRecord16((TestRecord), (decoder));
-        populate_TestRecord17((TestRecord), (decoder));
-        populate_TestRecord18((TestRecord), (decoder));
+        populate_TestRecord0((TestRecord), (customization), (decoder));
+        populate_TestRecord1((TestRecord), (customization), (decoder));
+        populate_TestRecord2((TestRecord), (customization), (decoder));
+        populate_TestRecord3((TestRecord), (customization), (decoder));
+        populate_TestRecord4((TestRecord), (customization), (decoder));
+        populate_TestRecord5((TestRecord), (customization), (decoder));
+        populate_TestRecord6((TestRecord), (customization), (decoder));
+        populate_TestRecord7((TestRecord), (customization), (decoder));
+        populate_TestRecord8((TestRecord), (customization), (decoder));
+        populate_TestRecord9((TestRecord), (customization), (decoder));
+        populate_TestRecord10((TestRecord), (customization), (decoder));
+        populate_TestRecord11((TestRecord), (customization), (decoder));
+        populate_TestRecord12((TestRecord), (customization), (decoder));
+        populate_TestRecord13((TestRecord), (customization), (decoder));
+        populate_TestRecord14((TestRecord), (customization), (decoder));
+        populate_TestRecord15((TestRecord), (customization), (decoder));
+        populate_TestRecord16((TestRecord), (customization), (decoder));
+        populate_TestRecord17((TestRecord), (customization), (decoder));
+        populate_TestRecord18((TestRecord), (customization), (decoder));
         return TestRecord;
     }
 
-    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -115,7 +106,7 @@ private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(2, (decoder.readLong()));
     }
 
-    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -132,7 +123,7 @@ private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(4, (decoder.readDouble()));
     }
 
-    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -149,7 +140,7 @@ private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(6, (decoder.readFloat()));
     }
 
-    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -166,7 +157,7 @@ private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(8, (decoder.readBoolean()));
     }
 
-    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -190,7 +181,7 @@ private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(10, byteBuffer0);
     }
 
-    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -221,7 +212,7 @@ private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(12, charSequence0);
     }
 
-    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
@@ -255,7 +246,7 @@ private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(14, testFixed1);
     }
 
-    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex7 = (decoder.readIndex());
@@ -315,7 +306,7 @@ private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(16, testFixedArray0);
     }
 
-    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericFixed> testFixedUnionArray0 = null;
@@ -365,7 +356,7 @@ private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(18, Enums.getConstant(TestEnum.class, (decoder.readEnum())));
     }
 
-    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex9 = (decoder.readIndex());
@@ -401,7 +392,7 @@ private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(20, testEnumArray0);
     }
 
-    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<TestEnum> testEnumUnionArray0 = null;
@@ -444,14 +435,14 @@ private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(22, null);
         } else {
             if (unionIndex11 == 1) {
-                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder)));
+                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecordUnion': "+ unionIndex11));
             }
         }
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord;
@@ -478,11 +469,11 @@ public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord
                 throw new RuntimeException(("Illegal union index for 'subField': "+ unionIndex12));
             }
         }
-        populate_SubRecord0((SubRecord), (decoder));
+        populate_SubRecord0((SubRecord), (customization), (decoder));
         return SubRecord;
     }
 
-    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, Decoder decoder)
+    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex13 = (decoder.readIndex());
@@ -505,10 +496,10 @@ private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubR
         }
     }
 
-    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder)));
+        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder), (customization)));
         List<com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArray0 = null;
         long chunkLen5 = (decoder.readArrayStart());
         Object oldArray4 = TestRecord.get(24);
@@ -528,39 +519,29 @@ private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.Te
                 if (oldArray4 instanceof GenericArray) {
                     recordsArrayArrayElementReuseVar0 = ((GenericArray) oldArray4).peek();
                 }
-                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder)));
+                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen5 = (decoder.arrayNext());
         }
         TestRecord.put(24, recordsArray0);
     }
 
-    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMap0 = null;
         long chunkLen6 = (decoder.readMapStart());
         if (chunkLen6 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapReuse0 = null;
-            Object oldMap0 = TestRecord.get(25);
-            if (oldMap0 instanceof Map) {
-                recordsMapReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapReuse0 != (null)) {
-                recordsMapReuse0 .clear();
-                recordsMap0 = recordsMapReuse0;
-            } else {
-                recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen6 * 4)+ 2)/ 3)));
-            }
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), ((int) chunkLen6)));
             do {
                 for (int counter6 = 0; (counter6 <chunkLen6); counter6 ++) {
                     Utf8 key1 = (decoder.readString(null));
-                    recordsMap0 .put(key1, deserializeSubRecord0(null, (decoder)));
+                    recordsMap0 .put(key1, deserializeSubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen6 = (decoder.mapNext());
             } while (chunkLen6 > 0);
         } else {
-            recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), 0));
         }
         TestRecord.put(25, recordsMap0);
         int unionIndex14 = (decoder.readIndex());
@@ -594,7 +575,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
                             recordsArrayUnionOption0 .add(null);
                         } else {
                             if (unionIndex15 == 1) {
-                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder)));
+                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder), (customization)));
                             } else {
                                 throw new RuntimeException(("Illegal union index for 'recordsArrayUnionOptionElem': "+ unionIndex15));
                             }
@@ -609,7 +590,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex16 = (decoder.readIndex());
@@ -621,17 +602,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOption0 = null;
                 long chunkLen8 = (decoder.readMapStart());
                 if (chunkLen8 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOptionReuse0 = null;
-                    Object oldMap1 = TestRecord.get(27);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapUnionOptionReuse0 != (null)) {
-                        recordsMapUnionOptionReuse0 .clear();
-                        recordsMapUnionOption0 = recordsMapUnionOptionReuse0;
-                    } else {
-                        recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen8 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), ((int) chunkLen8)));
                     do {
                         for (int counter8 = 0; (counter8 <chunkLen8); counter8 ++) {
                             Utf8 key2 = (decoder.readString(null));
@@ -641,7 +612,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapUnionOption0 .put(key2, null);
                             } else {
                                 if (unionIndex17 == 1) {
-                                    recordsMapUnionOption0 .put(key2, deserializeSubRecord0(null, (decoder)));
+                                    recordsMapUnionOption0 .put(key2, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapUnionOptionValue': "+ unionIndex17));
                                 }
@@ -650,7 +621,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen8 = (decoder.mapNext());
                     } while (chunkLen8 > 0);
                 } else {
-                    recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), 0));
                 }
                 TestRecord.put(27, recordsMapUnionOption0);
             } else {
@@ -679,16 +650,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElem0 = null;
                 long chunkLen10 = (decoder.readMapStart());
                 if (chunkLen10 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElemReuse0 = null;
-                    if (recordsArrayMapArrayElementReuseVar0 instanceof Map) {
-                        recordsArrayMapElemReuse0 = ((Map) recordsArrayMapArrayElementReuseVar0);
-                    }
-                    if (recordsArrayMapElemReuse0 != (null)) {
-                        recordsArrayMapElemReuse0 .clear();
-                        recordsArrayMapElem0 = recordsArrayMapElemReuse0;
-                    } else {
-                        recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen10 * 4)+ 2)/ 3)));
-                    }
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, ((int) chunkLen10)));
                     do {
                         for (int counter10 = 0; (counter10 <chunkLen10); counter10 ++) {
                             Utf8 key3 = (decoder.readString(null));
@@ -698,7 +660,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsArrayMapElem0 .put(key3, null);
                             } else {
                                 if (unionIndex18 == 1) {
-                                    recordsArrayMapElem0 .put(key3, deserializeSubRecord0(null, (decoder)));
+                                    recordsArrayMapElem0 .put(key3, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsArrayMapElemValue': "+ unionIndex18));
                                 }
@@ -707,7 +669,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen10 = (decoder.mapNext());
                     } while (chunkLen10 > 0);
                 } else {
-                    recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, 0));
                 }
                 recordsArrayMap0 .add(recordsArrayMapElem0);
             }
@@ -716,23 +678,13 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(28, recordsArrayMap0);
     }
 
-    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArray0 = null;
         long chunkLen11 = (decoder.readMapStart());
         if (chunkLen11 > 0) {
-            Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayReuse0 = null;
-            Object oldMap2 = TestRecord.get(29);
-            if (oldMap2 instanceof Map) {
-                recordsMapArrayReuse0 = ((Map) oldMap2);
-            }
-            if (recordsMapArrayReuse0 != (null)) {
-                recordsMapArrayReuse0 .clear();
-                recordsMapArray0 = recordsMapArrayReuse0;
-            } else {
-                recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen11 * 4)+ 2)/ 3)));
-            }
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), ((int) chunkLen11)));
             do {
                 for (int counter11 = 0; (counter11 <chunkLen11); counter11 ++) {
                     Utf8 key4 = (decoder.readString(null));
@@ -760,7 +712,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapArrayValue0 .add(null);
                             } else {
                                 if (unionIndex19 == 1) {
-                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder)));
+                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapArrayValueElem': "+ unionIndex19));
                                 }
@@ -773,7 +725,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 chunkLen11 = (decoder.mapNext());
             } while (chunkLen11 > 0);
         } else {
-            recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), 0));
         }
         TestRecord.put(29, recordsMapArray0);
         int unionIndex20 = (decoder.readIndex());
@@ -804,16 +756,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElem0 = null;
                         long chunkLen14 = (decoder.readMapStart());
                         if (chunkLen14 > 0) {
-                            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElemReuse0 = null;
-                            if (recordsArrayMapUnionOptionArrayElementReuseVar0 instanceof Map) {
-                                recordsArrayMapUnionOptionElemReuse0 = ((Map) recordsArrayMapUnionOptionArrayElementReuseVar0);
-                            }
-                            if (recordsArrayMapUnionOptionElemReuse0 != (null)) {
-                                recordsArrayMapUnionOptionElemReuse0 .clear();
-                                recordsArrayMapUnionOptionElem0 = recordsArrayMapUnionOptionElemReuse0;
-                            } else {
-                                recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen14 * 4)+ 2)/ 3)));
-                            }
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, ((int) chunkLen14)));
                             do {
                                 for (int counter14 = 0; (counter14 <chunkLen14); counter14 ++) {
                                     Utf8 key5 = (decoder.readString(null));
@@ -823,7 +766,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsArrayMapUnionOptionElem0 .put(key5, null);
                                     } else {
                                         if (unionIndex21 == 1) {
-                                            recordsArrayMapUnionOptionElem0 .put(key5, deserializeSubRecord0(null, (decoder)));
+                                            recordsArrayMapUnionOptionElem0 .put(key5, deserializeSubRecord0(null, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsArrayMapUnionOptionElemValue': "+ unionIndex21));
                                         }
@@ -832,7 +775,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 chunkLen14 = (decoder.mapNext());
                             } while (chunkLen14 > 0);
                         } else {
-                            recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, 0));
                         }
                         recordsArrayMapUnionOption0 .add(recordsArrayMapUnionOptionElem0);
                     }
@@ -845,7 +788,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex22 = (decoder.readIndex());
@@ -857,17 +800,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOption0 = null;
                 long chunkLen15 = (decoder.readMapStart());
                 if (chunkLen15 > 0) {
-                    Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOptionReuse0 = null;
-                    Object oldMap3 = TestRecord.get(31);
-                    if (oldMap3 instanceof Map) {
-                        recordsMapArrayUnionOptionReuse0 = ((Map) oldMap3);
-                    }
-                    if (recordsMapArrayUnionOptionReuse0 != (null)) {
-                        recordsMapArrayUnionOptionReuse0 .clear();
-                        recordsMapArrayUnionOption0 = recordsMapArrayUnionOptionReuse0;
-                    } else {
-                        recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen15 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), ((int) chunkLen15)));
                     do {
                         for (int counter15 = 0; (counter15 <chunkLen15); counter15 ++) {
                             Utf8 key6 = (decoder.readString(null));
@@ -895,7 +828,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsMapArrayUnionOptionValue0 .add(null);
                                     } else {
                                         if (unionIndex23 == 1) {
-                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder)));
+                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsMapArrayUnionOptionValueElem': "+ unionIndex23));
                                         }
@@ -908,7 +841,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen15 = (decoder.mapNext());
                     } while (chunkLen15 > 0);
                 } else {
-                    recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), 0));
                 }
                 TestRecord.put(31, recordsMapArrayUnionOption0);
             } else {
@@ -921,7 +854,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(32, null);
         } else {
             if (unionIndex24 == 1) {
-                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder)));
+                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder), (customization)));
             } else {
                 if (unionIndex24 == 2) {
                     Utf8 charSequence4;
@@ -943,7 +876,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveBooleanList booleanArray0 = null;
@@ -980,7 +913,7 @@ private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(34, doubleArray0);
     }
 
-    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveFloatList floatArray0 = null;
@@ -1004,7 +937,7 @@ private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(36, intArray0);
     }
 
-    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveLongList longArray0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_UNION_GenericDeserializer_2140000109_2140000109.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_UNION_GenericDeserializer_2140000109_2140000109.java
index fa348963d..dc63d32d7 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_UNION_GenericDeserializer_2140000109_2140000109.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_UNION_GenericDeserializer_2140000109_2140000109.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -26,22 +26,13 @@ public Map_of_UNION_GenericDeserializer_2140000109_2140000109(Schema readerSchem
         this.field0 = mapValueOptionSchema0 .getField("field").schema();
     }
 
-    public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Decoder decoder)
+    public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         Map<Utf8, IndexedRecord> map0 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, IndexedRecord> mapReuse0 = null;
-            if ((reuse) instanceof Map) {
-                mapReuse0 = ((Map)(reuse));
-            }
-            if (mapReuse0 != (null)) {
-                mapReuse0 .clear();
-                map0 = mapReuse0;
-            } else {
-                map0 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
@@ -51,7 +42,7 @@ public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Deco
                         map0 .put(key0, null);
                     } else {
                         if (unionIndex0 == 1) {
-                            map0 .put(key0, deserializerecord0(null, (decoder)));
+                            map0 .put(key0, deserializerecord0(null, (decoder), (customization)));
                         } else {
                             throw new RuntimeException(("Illegal union index for 'mapValue': "+ unionIndex0));
                         }
@@ -60,12 +51,12 @@ public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Deco
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            map0 = new HashMap<Utf8, IndexedRecord>(0);
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), 0));
         }
         return map0;
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_UNION_SpecificDeserializer_971650236_971650236.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_UNION_SpecificDeserializer_971650236_971650236.java
index a03953107..5df9a69ca 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_UNION_SpecificDeserializer_971650236_971650236.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_UNION_SpecificDeserializer_971650236_971650236.java
@@ -4,7 +4,6 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.api.PrimitiveBooleanList;
@@ -14,6 +13,7 @@
 import com.linkedin.avro.api.PrimitiveLongList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestFixed;
 import com.linkedin.avro.fastserde.primitive.PrimitiveBooleanArrayList;
@@ -37,22 +37,13 @@ public Map_of_UNION_SpecificDeserializer_971650236_971650236(Schema readerSchema
         this.readerSchema = readerSchema;
     }
 
-    public Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> reuse, Decoder decoder)
+    public Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> deserialize(Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> map0 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> mapReuse0 = null;
-            if ((reuse) instanceof Map) {
-                mapReuse0 = ((Map)(reuse));
-            }
-            if (mapReuse0 != (null)) {
-                mapReuse0 .clear();
-                map0 = mapReuse0;
-            } else {
-                map0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
@@ -62,7 +53,7 @@ public Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> deserial
                         map0 .put(key0, null);
                     } else {
                         if (unionIndex0 == 1) {
-                            map0 .put(key0, deserializeTestRecord0(null, (decoder)));
+                            map0 .put(key0, deserializeTestRecord0(null, (decoder), (customization)));
                         } else {
                             throw new RuntimeException(("Illegal union index for 'mapValue': "+ unionIndex0));
                         }
@@ -71,12 +62,12 @@ public Map<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord> deserial
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            map0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.TestRecord>(0);
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), 0));
         }
         return map0;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord;
@@ -86,29 +77,29 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
             TestRecord = new com.linkedin.avro.fastserde.generated.avro.TestRecord();
         }
         TestRecord.put(0, (decoder.readInt()));
-        populate_TestRecord0((TestRecord), (decoder));
-        populate_TestRecord1((TestRecord), (decoder));
-        populate_TestRecord2((TestRecord), (decoder));
-        populate_TestRecord3((TestRecord), (decoder));
-        populate_TestRecord4((TestRecord), (decoder));
-        populate_TestRecord5((TestRecord), (decoder));
-        populate_TestRecord6((TestRecord), (decoder));
-        populate_TestRecord7((TestRecord), (decoder));
-        populate_TestRecord8((TestRecord), (decoder));
-        populate_TestRecord9((TestRecord), (decoder));
-        populate_TestRecord10((TestRecord), (decoder));
-        populate_TestRecord11((TestRecord), (decoder));
-        populate_TestRecord12((TestRecord), (decoder));
-        populate_TestRecord13((TestRecord), (decoder));
-        populate_TestRecord14((TestRecord), (decoder));
-        populate_TestRecord15((TestRecord), (decoder));
-        populate_TestRecord16((TestRecord), (decoder));
-        populate_TestRecord17((TestRecord), (decoder));
-        populate_TestRecord18((TestRecord), (decoder));
+        populate_TestRecord0((TestRecord), (customization), (decoder));
+        populate_TestRecord1((TestRecord), (customization), (decoder));
+        populate_TestRecord2((TestRecord), (customization), (decoder));
+        populate_TestRecord3((TestRecord), (customization), (decoder));
+        populate_TestRecord4((TestRecord), (customization), (decoder));
+        populate_TestRecord5((TestRecord), (customization), (decoder));
+        populate_TestRecord6((TestRecord), (customization), (decoder));
+        populate_TestRecord7((TestRecord), (customization), (decoder));
+        populate_TestRecord8((TestRecord), (customization), (decoder));
+        populate_TestRecord9((TestRecord), (customization), (decoder));
+        populate_TestRecord10((TestRecord), (customization), (decoder));
+        populate_TestRecord11((TestRecord), (customization), (decoder));
+        populate_TestRecord12((TestRecord), (customization), (decoder));
+        populate_TestRecord13((TestRecord), (customization), (decoder));
+        populate_TestRecord14((TestRecord), (customization), (decoder));
+        populate_TestRecord15((TestRecord), (customization), (decoder));
+        populate_TestRecord16((TestRecord), (customization), (decoder));
+        populate_TestRecord17((TestRecord), (customization), (decoder));
+        populate_TestRecord18((TestRecord), (customization), (decoder));
         return TestRecord;
     }
 
-    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -125,7 +116,7 @@ private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(2, (decoder.readLong()));
     }
 
-    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -142,7 +133,7 @@ private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(4, (decoder.readDouble()));
     }
 
-    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -159,7 +150,7 @@ private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(6, (decoder.readFloat()));
     }
 
-    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -176,7 +167,7 @@ private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(8, (decoder.readBoolean()));
     }
 
-    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -200,7 +191,7 @@ private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(10, byteBuffer0);
     }
 
-    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
@@ -231,7 +222,7 @@ private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(12, charSequence0);
     }
 
-    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex7 = (decoder.readIndex());
@@ -265,7 +256,7 @@ private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(14, testFixed1);
     }
 
-    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex8 = (decoder.readIndex());
@@ -325,7 +316,7 @@ private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(16, testFixedArray0);
     }
 
-    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericFixed> testFixedUnionArray0 = null;
@@ -375,7 +366,7 @@ private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(18, Enums.getConstant(TestEnum.class, (decoder.readEnum())));
     }
 
-    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex10 = (decoder.readIndex());
@@ -411,7 +402,7 @@ private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(20, testEnumArray0);
     }
 
-    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<TestEnum> testEnumUnionArray0 = null;
@@ -454,14 +445,14 @@ private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(22, null);
         } else {
             if (unionIndex12 == 1) {
-                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder)));
+                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecordUnion': "+ unionIndex12));
             }
         }
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord;
@@ -488,11 +479,11 @@ public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord
                 throw new RuntimeException(("Illegal union index for 'subField': "+ unionIndex13));
             }
         }
-        populate_SubRecord0((SubRecord), (decoder));
+        populate_SubRecord0((SubRecord), (customization), (decoder));
         return SubRecord;
     }
 
-    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, Decoder decoder)
+    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex14 = (decoder.readIndex());
@@ -515,10 +506,10 @@ private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubR
         }
     }
 
-    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder)));
+        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder), (customization)));
         List<com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArray0 = null;
         long chunkLen5 = (decoder.readArrayStart());
         Object oldArray4 = TestRecord.get(24);
@@ -538,39 +529,29 @@ private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.Te
                 if (oldArray4 instanceof GenericArray) {
                     recordsArrayArrayElementReuseVar0 = ((GenericArray) oldArray4).peek();
                 }
-                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder)));
+                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen5 = (decoder.arrayNext());
         }
         TestRecord.put(24, recordsArray0);
     }
 
-    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMap0 = null;
         long chunkLen6 = (decoder.readMapStart());
         if (chunkLen6 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapReuse0 = null;
-            Object oldMap0 = TestRecord.get(25);
-            if (oldMap0 instanceof Map) {
-                recordsMapReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapReuse0 != (null)) {
-                recordsMapReuse0 .clear();
-                recordsMap0 = recordsMapReuse0;
-            } else {
-                recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen6 * 4)+ 2)/ 3)));
-            }
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), ((int) chunkLen6)));
             do {
                 for (int counter6 = 0; (counter6 <chunkLen6); counter6 ++) {
                     Utf8 key1 = (decoder.readString(null));
-                    recordsMap0 .put(key1, deserializeSubRecord0(null, (decoder)));
+                    recordsMap0 .put(key1, deserializeSubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen6 = (decoder.mapNext());
             } while (chunkLen6 > 0);
         } else {
-            recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), 0));
         }
         TestRecord.put(25, recordsMap0);
         int unionIndex15 = (decoder.readIndex());
@@ -604,7 +585,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
                             recordsArrayUnionOption0 .add(null);
                         } else {
                             if (unionIndex16 == 1) {
-                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder)));
+                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder), (customization)));
                             } else {
                                 throw new RuntimeException(("Illegal union index for 'recordsArrayUnionOptionElem': "+ unionIndex16));
                             }
@@ -619,7 +600,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex17 = (decoder.readIndex());
@@ -631,17 +612,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOption0 = null;
                 long chunkLen8 = (decoder.readMapStart());
                 if (chunkLen8 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOptionReuse0 = null;
-                    Object oldMap1 = TestRecord.get(27);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapUnionOptionReuse0 != (null)) {
-                        recordsMapUnionOptionReuse0 .clear();
-                        recordsMapUnionOption0 = recordsMapUnionOptionReuse0;
-                    } else {
-                        recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen8 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), ((int) chunkLen8)));
                     do {
                         for (int counter8 = 0; (counter8 <chunkLen8); counter8 ++) {
                             Utf8 key2 = (decoder.readString(null));
@@ -651,7 +622,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapUnionOption0 .put(key2, null);
                             } else {
                                 if (unionIndex18 == 1) {
-                                    recordsMapUnionOption0 .put(key2, deserializeSubRecord0(null, (decoder)));
+                                    recordsMapUnionOption0 .put(key2, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapUnionOptionValue': "+ unionIndex18));
                                 }
@@ -660,7 +631,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen8 = (decoder.mapNext());
                     } while (chunkLen8 > 0);
                 } else {
-                    recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), 0));
                 }
                 TestRecord.put(27, recordsMapUnionOption0);
             } else {
@@ -689,16 +660,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElem0 = null;
                 long chunkLen10 = (decoder.readMapStart());
                 if (chunkLen10 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElemReuse0 = null;
-                    if (recordsArrayMapArrayElementReuseVar0 instanceof Map) {
-                        recordsArrayMapElemReuse0 = ((Map) recordsArrayMapArrayElementReuseVar0);
-                    }
-                    if (recordsArrayMapElemReuse0 != (null)) {
-                        recordsArrayMapElemReuse0 .clear();
-                        recordsArrayMapElem0 = recordsArrayMapElemReuse0;
-                    } else {
-                        recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen10 * 4)+ 2)/ 3)));
-                    }
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, ((int) chunkLen10)));
                     do {
                         for (int counter10 = 0; (counter10 <chunkLen10); counter10 ++) {
                             Utf8 key3 = (decoder.readString(null));
@@ -708,7 +670,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsArrayMapElem0 .put(key3, null);
                             } else {
                                 if (unionIndex19 == 1) {
-                                    recordsArrayMapElem0 .put(key3, deserializeSubRecord0(null, (decoder)));
+                                    recordsArrayMapElem0 .put(key3, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsArrayMapElemValue': "+ unionIndex19));
                                 }
@@ -717,7 +679,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen10 = (decoder.mapNext());
                     } while (chunkLen10 > 0);
                 } else {
-                    recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, 0));
                 }
                 recordsArrayMap0 .add(recordsArrayMapElem0);
             }
@@ -726,23 +688,13 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(28, recordsArrayMap0);
     }
 
-    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArray0 = null;
         long chunkLen11 = (decoder.readMapStart());
         if (chunkLen11 > 0) {
-            Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayReuse0 = null;
-            Object oldMap2 = TestRecord.get(29);
-            if (oldMap2 instanceof Map) {
-                recordsMapArrayReuse0 = ((Map) oldMap2);
-            }
-            if (recordsMapArrayReuse0 != (null)) {
-                recordsMapArrayReuse0 .clear();
-                recordsMapArray0 = recordsMapArrayReuse0;
-            } else {
-                recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen11 * 4)+ 2)/ 3)));
-            }
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), ((int) chunkLen11)));
             do {
                 for (int counter11 = 0; (counter11 <chunkLen11); counter11 ++) {
                     Utf8 key4 = (decoder.readString(null));
@@ -770,7 +722,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapArrayValue0 .add(null);
                             } else {
                                 if (unionIndex20 == 1) {
-                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder)));
+                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapArrayValueElem': "+ unionIndex20));
                                 }
@@ -783,7 +735,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 chunkLen11 = (decoder.mapNext());
             } while (chunkLen11 > 0);
         } else {
-            recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), 0));
         }
         TestRecord.put(29, recordsMapArray0);
         int unionIndex21 = (decoder.readIndex());
@@ -814,16 +766,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElem0 = null;
                         long chunkLen14 = (decoder.readMapStart());
                         if (chunkLen14 > 0) {
-                            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElemReuse0 = null;
-                            if (recordsArrayMapUnionOptionArrayElementReuseVar0 instanceof Map) {
-                                recordsArrayMapUnionOptionElemReuse0 = ((Map) recordsArrayMapUnionOptionArrayElementReuseVar0);
-                            }
-                            if (recordsArrayMapUnionOptionElemReuse0 != (null)) {
-                                recordsArrayMapUnionOptionElemReuse0 .clear();
-                                recordsArrayMapUnionOptionElem0 = recordsArrayMapUnionOptionElemReuse0;
-                            } else {
-                                recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen14 * 4)+ 2)/ 3)));
-                            }
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, ((int) chunkLen14)));
                             do {
                                 for (int counter14 = 0; (counter14 <chunkLen14); counter14 ++) {
                                     Utf8 key5 = (decoder.readString(null));
@@ -833,7 +776,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsArrayMapUnionOptionElem0 .put(key5, null);
                                     } else {
                                         if (unionIndex22 == 1) {
-                                            recordsArrayMapUnionOptionElem0 .put(key5, deserializeSubRecord0(null, (decoder)));
+                                            recordsArrayMapUnionOptionElem0 .put(key5, deserializeSubRecord0(null, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsArrayMapUnionOptionElemValue': "+ unionIndex22));
                                         }
@@ -842,7 +785,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 chunkLen14 = (decoder.mapNext());
                             } while (chunkLen14 > 0);
                         } else {
-                            recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, 0));
                         }
                         recordsArrayMapUnionOption0 .add(recordsArrayMapUnionOptionElem0);
                     }
@@ -855,7 +798,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex23 = (decoder.readIndex());
@@ -867,17 +810,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOption0 = null;
                 long chunkLen15 = (decoder.readMapStart());
                 if (chunkLen15 > 0) {
-                    Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOptionReuse0 = null;
-                    Object oldMap3 = TestRecord.get(31);
-                    if (oldMap3 instanceof Map) {
-                        recordsMapArrayUnionOptionReuse0 = ((Map) oldMap3);
-                    }
-                    if (recordsMapArrayUnionOptionReuse0 != (null)) {
-                        recordsMapArrayUnionOptionReuse0 .clear();
-                        recordsMapArrayUnionOption0 = recordsMapArrayUnionOptionReuse0;
-                    } else {
-                        recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen15 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), ((int) chunkLen15)));
                     do {
                         for (int counter15 = 0; (counter15 <chunkLen15); counter15 ++) {
                             Utf8 key6 = (decoder.readString(null));
@@ -905,7 +838,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsMapArrayUnionOptionValue0 .add(null);
                                     } else {
                                         if (unionIndex24 == 1) {
-                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder)));
+                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsMapArrayUnionOptionValueElem': "+ unionIndex24));
                                         }
@@ -918,7 +851,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen15 = (decoder.mapNext());
                     } while (chunkLen15 > 0);
                 } else {
-                    recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), 0));
                 }
                 TestRecord.put(31, recordsMapArrayUnionOption0);
             } else {
@@ -931,7 +864,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(32, null);
         } else {
             if (unionIndex25 == 1) {
-                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder)));
+                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder), (customization)));
             } else {
                 if (unionIndex25 == 2) {
                     Utf8 charSequence4;
@@ -953,7 +886,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveBooleanList booleanArray0 = null;
@@ -990,7 +923,7 @@ private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(34, doubleArray0);
     }
 
-    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveFloatList floatArray0 = null;
@@ -1014,7 +947,7 @@ private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(36, intArray0);
     }
 
-    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveLongList longArray0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_record_GenericDeserializer_1223705675_568621313.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_record_GenericDeserializer_1223705675_568621313.java
index 24f5dc5ce..3ee9655b8 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_record_GenericDeserializer_1223705675_568621313.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_record_GenericDeserializer_1223705675_568621313.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,7 +23,7 @@ public Map_of_record_GenericDeserializer_1223705675_568621313(Schema readerSchem
         this.unionOptionMapValueSchema0 = readerSchema.getValueType();
     }
 
-    public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Decoder decoder)
+    public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -34,25 +34,16 @@ public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Deco
                 Map<Utf8, IndexedRecord> unionOption0 = null;
                 long chunkLen0 = (decoder.readMapStart());
                 if (chunkLen0 > 0) {
-                    Map<Utf8, IndexedRecord> unionOptionReuse0 = null;
-                    if ((reuse) instanceof Map) {
-                        unionOptionReuse0 = ((Map)(reuse));
-                    }
-                    if (unionOptionReuse0 != (null)) {
-                        unionOptionReuse0 .clear();
-                        unionOption0 = unionOptionReuse0;
-                    } else {
-                        unionOption0 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-                    }
+                    unionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), ((int) chunkLen0)));
                     do {
                         for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                             Utf8 key0 = (decoder.readString(null));
-                            unionOption0 .put(key0, deserializerecord0(null, (decoder)));
+                            unionOption0 .put(key0, deserializerecord0(null, (decoder), (customization)));
                         }
                         chunkLen0 = (decoder.mapNext());
                     } while (chunkLen0 > 0);
                 } else {
-                    unionOption0 = new HashMap<Utf8, IndexedRecord>(0);
+                    unionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), 0));
                 }
                 return unionOption0;
             } else {
@@ -61,7 +52,7 @@ public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Deco
         }
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_record_GenericDeserializer_1677529043_1677529043.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_record_GenericDeserializer_1677529043_1677529043.java
index 6185ef7aa..426cc857c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_record_GenericDeserializer_1677529043_1677529043.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/Map_of_record_GenericDeserializer_1677529043_1677529043.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,36 +24,27 @@ public Map_of_record_GenericDeserializer_1677529043_1677529043(Schema readerSche
         this.field0 = mapMapValueSchema0 .getField("field").schema();
     }
 
-    public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Decoder decoder)
+    public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         Map<Utf8, IndexedRecord> map0 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, IndexedRecord> mapReuse0 = null;
-            if ((reuse) instanceof Map) {
-                mapReuse0 = ((Map)(reuse));
-            }
-            if (mapReuse0 != (null)) {
-                mapReuse0 .clear();
-                map0 = mapReuse0;
-            } else {
-                map0 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    map0 .put(key0, deserializerecord0(null, (decoder)));
+                    map0 .put(key0, deserializerecord0(null, (decoder), (customization)));
                 }
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            map0 = new HashMap<Utf8, IndexedRecord>(0);
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), 0));
         }
         return map0;
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RecordWithLargeUnionField_SpecificDeserializer_1132455741_1570175609.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RecordWithLargeUnionField_SpecificDeserializer_1132455741_1570175609.java
index 25706d7ee..a6218d59f 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RecordWithLargeUnionField_SpecificDeserializer_1132455741_1570175609.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RecordWithLargeUnionField_SpecificDeserializer_1132455741_1570175609.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.io.Decoder;
@@ -18,13 +19,13 @@ public RecordWithLargeUnionField_SpecificDeserializer_1132455741_1570175609(Sche
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.RecordWithLargeUnionField deserialize(com.linkedin.avro.fastserde.generated.avro.RecordWithLargeUnionField reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.RecordWithLargeUnionField deserialize(com.linkedin.avro.fastserde.generated.avro.RecordWithLargeUnionField reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeRecordWithLargeUnionField0((reuse), (decoder));
+        return deserializeRecordWithLargeUnionField0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.RecordWithLargeUnionField deserializeRecordWithLargeUnionField0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.RecordWithLargeUnionField deserializeRecordWithLargeUnionField0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.RecordWithLargeUnionField RecordWithLargeUnionField;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RemovedTypesTestRecord_SpecificDeserializer_1438463600_36310691.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RemovedTypesTestRecord_SpecificDeserializer_1438463600_36310691.java
index effdb2b31..a38df0593 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RemovedTypesTestRecord_SpecificDeserializer_1438463600_36310691.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RemovedTypesTestRecord_SpecificDeserializer_1438463600_36310691.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.io.Decoder;
 import org.apache.avro.util.Utf8;
@@ -17,13 +18,13 @@ public RemovedTypesTestRecord_SpecificDeserializer_1438463600_36310691(Schema re
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeRemovedTypesTestRecord0((reuse), (decoder));
+        return deserializeRemovedTypesTestRecord0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deserializeRemovedTypesTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deserializeRemovedTypesTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RemovedTypesTestRecord_SpecificDeserializer_605055252_36310691.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RemovedTypesTestRecord_SpecificDeserializer_605055252_36310691.java
index dcbd0544d..c17a49b92 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RemovedTypesTestRecord_SpecificDeserializer_605055252_36310691.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/RemovedTypesTestRecord_SpecificDeserializer_605055252_36310691.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.io.Decoder;
@@ -18,13 +19,13 @@ public RemovedTypesTestRecord_SpecificDeserializer_605055252_36310691(Schema rea
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeRemovedTypesTestRecord0((reuse), (decoder));
+        return deserializeRemovedTypesTestRecord0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deserializeRemovedTypesTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deserializeRemovedTypesTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord;
@@ -41,22 +42,22 @@ public com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord deseria
             charSequence0 = (decoder).readString(null);
         }
         RemovedTypesTestRecord.put(0, charSequence0);
-        populate_RemovedTypesTestRecord0((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord1((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord2((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord3((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord4((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord5((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord6((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord7((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord8((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord9((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord10((RemovedTypesTestRecord), (decoder));
-        populate_RemovedTypesTestRecord11((RemovedTypesTestRecord), (decoder));
+        populate_RemovedTypesTestRecord0((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord1((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord2((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord3((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord4((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord5((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord6((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord7((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord8((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord9((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord10((RemovedTypesTestRecord), (customization), (decoder));
+        populate_RemovedTypesTestRecord11((RemovedTypesTestRecord), (customization), (decoder));
         return RemovedTypesTestRecord;
     }
 
-    private void populate_RemovedTypesTestRecord0(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord0(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         decoder.skipBytes();
@@ -73,7 +74,7 @@ private void populate_RemovedTypesTestRecord0(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord1(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord1(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -98,7 +99,7 @@ private void populate_RemovedTypesTestRecord1(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord2(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord2(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         long chunkLen2 = (decoder.readArrayStart());
@@ -142,7 +143,7 @@ private void populate_RemovedTypesTestRecord2(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord3(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord3(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         decoder.skipFixed(1);
@@ -158,7 +159,7 @@ private void populate_RemovedTypesTestRecord3(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord4(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord4(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         long chunkLen4 = (decoder.readArrayStart());
@@ -184,7 +185,7 @@ private void populate_RemovedTypesTestRecord4(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord5(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord5(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         long chunkLen6 = (decoder.readArrayStart());
@@ -228,7 +229,7 @@ private void populate_RemovedTypesTestRecord5(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord6(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord6(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         decoder.readEnum();
@@ -244,7 +245,7 @@ private void populate_RemovedTypesTestRecord6(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord7(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord7(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         long chunkLen8 = (decoder.readArrayStart());
@@ -266,7 +267,7 @@ private void populate_RemovedTypesTestRecord7(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord8(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord8(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         long chunkLen10 = (decoder.readArrayStart());
@@ -310,29 +311,29 @@ private void populate_RemovedTypesTestRecord8(com.linkedin.avro.fastserde.genera
         }
     }
 
-    private void populate_RemovedTypesTestRecord9(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord9(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        deserializeRemovedSubRecord0(null, (decoder));
+        deserializeRemovedSubRecord0(null, (decoder), (customization));
         int unionIndex9 = (decoder.readIndex());
         if (unionIndex9 == 0) {
             decoder.readNull();
         } else {
             if (unionIndex9 == 1) {
-                deserializeRemovedSubRecord0(null, (decoder));
+                deserializeRemovedSubRecord0(null, (decoder), (customization));
             } else {
                 throw new RuntimeException(("Illegal union index for 'removedSubRecordUnion': "+ unionIndex9));
             }
         }
     }
 
-    public void deserializeRemovedSubRecord0(Object reuse, Decoder decoder)
+    public void deserializeRemovedSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         decoder.skipString();
     }
 
-    private void populate_RemovedTypesTestRecord10(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord10(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         long chunkLen12 = (decoder.readArrayStart());
@@ -342,7 +343,7 @@ private void populate_RemovedTypesTestRecord10(com.linkedin.avro.fastserde.gener
                 if (null instanceof GenericArray) {
                     removedSubRecordArrayArrayElementReuseVar0 = ((GenericArray) null).peek();
                 }
-                deserializeRemovedSubRecord0(removedSubRecordArrayArrayElementReuseVar0, (decoder));
+                deserializeRemovedSubRecord0(removedSubRecordArrayArrayElementReuseVar0, (decoder), (customization));
             }
             chunkLen12 = (decoder.arrayNext());
         }
@@ -358,7 +359,7 @@ private void populate_RemovedTypesTestRecord10(com.linkedin.avro.fastserde.gener
                     decoder.readNull();
                 } else {
                     if (unionIndex10 == 1) {
-                        deserializeRemovedSubRecord0(removedSubRecordUnionArrayArrayElementReuseVar0, (decoder));
+                        deserializeRemovedSubRecord0(removedSubRecordUnionArrayArrayElementReuseVar0, (decoder), (customization));
                     } else {
                         throw new RuntimeException(("Illegal union index for 'removedSubRecordUnionArrayElem': "+ unionIndex10));
                     }
@@ -368,7 +369,7 @@ private void populate_RemovedTypesTestRecord10(com.linkedin.avro.fastserde.gener
         }
     }
 
-    private void populate_RemovedTypesTestRecord11(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, Decoder decoder)
+    private void populate_RemovedTypesTestRecord11(com.linkedin.avro.fastserde.generated.avro.RemovedTypesTestRecord RemovedTypesTestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         long chunkLen14 = (decoder.readMapStart());
@@ -376,7 +377,7 @@ private void populate_RemovedTypesTestRecord11(com.linkedin.avro.fastserde.gener
             do {
                 for (int counter14 = 0; (counter14 <chunkLen14); counter14 ++) {
                     Utf8 key6 = (decoder.readString(null));
-                    deserializeRemovedSubRecord0(null, (decoder));
+                    deserializeRemovedSubRecord0(null, (decoder), (customization));
                 }
                 chunkLen14 = (decoder.mapNext());
             } while (chunkLen14 > 0);
@@ -391,7 +392,7 @@ private void populate_RemovedTypesTestRecord11(com.linkedin.avro.fastserde.gener
                         decoder.readNull();
                     } else {
                         if (unionIndex11 == 1) {
-                            deserializeRemovedSubRecord0(null, (decoder));
+                            deserializeRemovedSubRecord0(null, (decoder), (customization));
                         } else {
                             throw new RuntimeException(("Illegal union index for 'removedSubRecordUnionMapValue': "+ unionIndex11));
                         }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/SplitRecordTest1_SpecificDeserializer_1718878379_595582209.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/SplitRecordTest1_SpecificDeserializer_1718878379_595582209.java
index bc6c0ce3f..4f732195d 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/SplitRecordTest1_SpecificDeserializer_1718878379_595582209.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/SplitRecordTest1_SpecificDeserializer_1718878379_595582209.java
@@ -5,6 +5,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public SplitRecordTest1_SpecificDeserializer_1718878379_595582209(Schema readerS
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 deserialize(com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 deserialize(com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeSplitRecordTest10((reuse), (decoder));
+        return deserializeSplitRecordTest10((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 deserializeSplitRecordTest10(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 deserializeSplitRecordTest10(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 SplitRecordTest1;
@@ -35,12 +36,12 @@ public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 deserializeSp
         } else {
             SplitRecordTest1 = new com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1();
         }
-        SplitRecordTest1 .put(0, deserializeFullRecord0(SplitRecordTest1 .get(0), (decoder)));
-        populate_SplitRecordTest10((SplitRecordTest1), (decoder));
+        SplitRecordTest1 .put(0, deserializeFullRecord0(SplitRecordTest1 .get(0), (decoder), (customization)));
+        populate_SplitRecordTest10((SplitRecordTest1), (customization), (decoder));
         return SplitRecordTest1;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.FullRecord FullRecord;
@@ -71,10 +72,10 @@ public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullReco
         return FullRecord;
     }
 
-    private void populate_SplitRecordTest10(com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 SplitRecordTest1, Decoder decoder)
+    private void populate_SplitRecordTest10(com.linkedin.avro.fastserde.generated.avro.SplitRecordTest1 SplitRecordTest1, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        SplitRecordTest1 .put(1, deserializeFullRecord1(SplitRecordTest1 .get(1), (decoder)));
+        SplitRecordTest1 .put(1, deserializeFullRecord1(SplitRecordTest1 .get(1), (decoder), (customization)));
         List<com.linkedin.avro.fastserde.generated.avro.FullRecord> record30 = null;
         long chunkLen0 = (decoder.readArrayStart());
         Object oldArray0 = SplitRecordTest1 .get(2);
@@ -94,14 +95,14 @@ private void populate_SplitRecordTest10(com.linkedin.avro.fastserde.generated.av
                 if (oldArray0 instanceof GenericArray) {
                     record3ArrayElementReuseVar0 = ((GenericArray) oldArray0).peek();
                 }
-                record30 .add(deserializeFullRecord2(record3ArrayElementReuseVar0, (decoder)));
+                record30 .add(deserializeFullRecord2(record3ArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen0 = (decoder.arrayNext());
         }
         SplitRecordTest1 .put(2, record30);
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullRecord1(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullRecord1(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.FullRecord FullRecord;
@@ -125,7 +126,7 @@ public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullReco
         return FullRecord;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullRecord2(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullRecord2(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.FullRecord FullRecord;
@@ -152,11 +153,11 @@ public com.linkedin.avro.fastserde.generated.avro.FullRecord deserializeFullReco
                 throw new RuntimeException(("Illegal union index for 'field1': "+ unionIndex2));
             }
         }
-        populate_FullRecord0((FullRecord), (decoder));
+        populate_FullRecord0((FullRecord), (customization), (decoder));
         return FullRecord;
     }
 
-    private void populate_FullRecord0(com.linkedin.avro.fastserde.generated.avro.FullRecord FullRecord, Decoder decoder)
+    private void populate_FullRecord0(com.linkedin.avro.fastserde.generated.avro.FullRecord FullRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/SplitRecordTest2_SpecificDeserializer_595582209_1718878379.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/SplitRecordTest2_SpecificDeserializer_595582209_1718878379.java
index c9d12c196..c21b04588 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/SplitRecordTest2_SpecificDeserializer_595582209_1718878379.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/SplitRecordTest2_SpecificDeserializer_595582209_1718878379.java
@@ -5,6 +5,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.FullRecord;
 import com.linkedin.avro.fastserde.generated.avro.StringRecord;
 import org.apache.avro.Schema;
@@ -22,13 +23,13 @@ public SplitRecordTest2_SpecificDeserializer_595582209_1718878379(Schema readerS
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 deserialize(com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 deserialize(com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeSplitRecordTest20((reuse), (decoder));
+        return deserializeSplitRecordTest20((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 deserializeSplitRecordTest20(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 deserializeSplitRecordTest20(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 SplitRecordTest2;
@@ -37,12 +38,12 @@ public com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 deserializeSp
         } else {
             SplitRecordTest2 = new com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2();
         }
-        SplitRecordTest2 .put(0, deserializeStringRecord0(SplitRecordTest2 .get(0), (decoder)));
-        populate_SplitRecordTest20((SplitRecordTest2), (decoder));
+        SplitRecordTest2 .put(0, deserializeStringRecord0(SplitRecordTest2 .get(0), (decoder), (customization)));
+        populate_SplitRecordTest20((SplitRecordTest2), (customization), (decoder));
         return SplitRecordTest2;
     }
 
-    public StringRecord deserializeStringRecord0(Object reuse, Decoder decoder)
+    public StringRecord deserializeStringRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         StringRecord IntRecord;
@@ -69,11 +70,11 @@ public StringRecord deserializeStringRecord0(Object reuse, Decoder decoder)
                 throw new RuntimeException(("Illegal union index for 'field1': "+ unionIndex0));
             }
         }
-        populate_IntRecord0((IntRecord), (decoder));
+        populate_IntRecord0((IntRecord), (customization), (decoder));
         return IntRecord;
     }
 
-    private void populate_IntRecord0(StringRecord IntRecord, Decoder decoder)
+    private void populate_IntRecord0(StringRecord IntRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -88,10 +89,10 @@ private void populate_IntRecord0(StringRecord IntRecord, Decoder decoder)
         }
     }
 
-    private void populate_SplitRecordTest20(com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 SplitRecordTest2, Decoder decoder)
+    private void populate_SplitRecordTest20(com.linkedin.avro.fastserde.generated.avro.SplitRecordTest2 SplitRecordTest2, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        SplitRecordTest2 .put(1, deserializeIntRecord0(SplitRecordTest2 .get(1), (decoder)));
+        SplitRecordTest2 .put(1, deserializeIntRecord0(SplitRecordTest2 .get(1), (decoder), (customization)));
         List<FullRecord> record30 = null;
         long chunkLen0 = (decoder.readArrayStart());
         Object oldArray0 = SplitRecordTest2 .get(2);
@@ -111,14 +112,14 @@ private void populate_SplitRecordTest20(com.linkedin.avro.fastserde.generated.av
                 if (oldArray0 instanceof GenericArray) {
                     record3ArrayElementReuseVar0 = ((GenericArray) oldArray0).peek();
                 }
-                record30 .add(deserializeFullRecord0(record3ArrayElementReuseVar0, (decoder)));
+                record30 .add(deserializeFullRecord0(record3ArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen0 = (decoder.arrayNext());
         }
         SplitRecordTest2 .put(2, record30);
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.IntRecord deserializeIntRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.IntRecord deserializeIntRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.IntRecord IntRecord;
@@ -137,11 +138,11 @@ public com.linkedin.avro.fastserde.generated.avro.IntRecord deserializeIntRecord
                 throw new RuntimeException(("Illegal union index for 'field1': "+ unionIndex2));
             }
         }
-        populate_IntRecord1((IntRecord), (decoder));
+        populate_IntRecord1((IntRecord), (customization), (decoder));
         return IntRecord;
     }
 
-    private void populate_IntRecord1(com.linkedin.avro.fastserde.generated.avro.IntRecord IntRecord, Decoder decoder)
+    private void populate_IntRecord1(com.linkedin.avro.fastserde.generated.avro.IntRecord IntRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -157,7 +158,7 @@ private void populate_IntRecord1(com.linkedin.avro.fastserde.generated.avro.IntR
         }
     }
 
-    public FullRecord deserializeFullRecord0(Object reuse, Decoder decoder)
+    public FullRecord deserializeFullRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         FullRecord IntRecord;
@@ -184,11 +185,11 @@ public FullRecord deserializeFullRecord0(Object reuse, Decoder decoder)
                 throw new RuntimeException(("Illegal union index for 'field1': "+ unionIndex4));
             }
         }
-        populate_IntRecord2((IntRecord), (decoder));
+        populate_IntRecord2((IntRecord), (customization), (decoder));
         return IntRecord;
     }
 
-    private void populate_IntRecord2(FullRecord IntRecord, Decoder decoder)
+    private void populate_IntRecord2(FullRecord IntRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/StringableRecord_SpecificDeserializer_842267318_842267318.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/StringableRecord_SpecificDeserializer_842267318_842267318.java
index e9ab6defe..f9560601c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/StringableRecord_SpecificDeserializer_842267318_842267318.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/StringableRecord_SpecificDeserializer_842267318_842267318.java
@@ -10,10 +10,10 @@
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroRuntimeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
@@ -30,11 +30,11 @@ public StringableRecord_SpecificDeserializer_842267318_842267318(Schema readerSc
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.StringableRecord deserialize(com.linkedin.avro.fastserde.generated.avro.StringableRecord reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.StringableRecord deserialize(com.linkedin.avro.fastserde.generated.avro.StringableRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         try {
-            return deserializeStringableRecord0((reuse), (decoder));
+            return deserializeStringableRecord0((reuse), (decoder), (customization));
         } catch (NumberFormatException e) {
             throw new AvroRuntimeException(e);
         } catch (MalformedURLException e) {
@@ -44,7 +44,7 @@ public com.linkedin.avro.fastserde.generated.avro.StringableRecord deserialize(c
         }
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.StringableRecord deserializeStringableRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.StringableRecord deserializeStringableRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException, NumberFormatException, MalformedURLException, URISyntaxException
     {
         com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord;
@@ -55,15 +55,15 @@ public com.linkedin.avro.fastserde.generated.avro.StringableRecord deserializeSt
         }
         BigInteger charSequence0 = new BigInteger((decoder.readString()));
         StringableRecord.put(0, charSequence0);
-        populate_StringableRecord0((StringableRecord), (decoder));
-        populate_StringableRecord1((StringableRecord), (decoder));
-        populate_StringableRecord2((StringableRecord), (decoder));
-        populate_StringableRecord3((StringableRecord), (decoder));
-        populate_StringableRecord4((StringableRecord), (decoder));
+        populate_StringableRecord0((StringableRecord), (customization), (decoder));
+        populate_StringableRecord1((StringableRecord), (customization), (decoder));
+        populate_StringableRecord2((StringableRecord), (customization), (decoder));
+        populate_StringableRecord3((StringableRecord), (customization), (decoder));
+        populate_StringableRecord4((StringableRecord), (customization), (decoder));
         return StringableRecord;
     }
 
-    private void populate_StringableRecord0(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, Decoder decoder)
+    private void populate_StringableRecord0(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException, NumberFormatException, URISyntaxException
     {
         BigDecimal charSequence1 = new BigDecimal((decoder.readString()));
@@ -72,7 +72,7 @@ private void populate_StringableRecord0(com.linkedin.avro.fastserde.generated.av
         StringableRecord.put(2, charSequence2);
     }
 
-    private void populate_StringableRecord1(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, Decoder decoder)
+    private void populate_StringableRecord1(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException, NumberFormatException, MalformedURLException, URISyntaxException
     {
         URL charSequence3 = new URL((decoder.readString()));
@@ -81,7 +81,7 @@ private void populate_StringableRecord1(com.linkedin.avro.fastserde.generated.av
         StringableRecord.put(4, charSequence4);
     }
 
-    private void populate_StringableRecord2(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, Decoder decoder)
+    private void populate_StringableRecord2(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException, NumberFormatException, MalformedURLException, URISyntaxException
     {
         List<URL> urlArray0 = null;
@@ -112,17 +112,7 @@ private void populate_StringableRecord2(com.linkedin.avro.fastserde.generated.av
         Map<URL, BigInteger> urlMap0 = null;
         long chunkLen1 = (decoder.readMapStart());
         if (chunkLen1 > 0) {
-            Map<URL, BigInteger> urlMapReuse0 = null;
-            Object oldMap0 = StringableRecord.get(6);
-            if (oldMap0 instanceof Map) {
-                urlMapReuse0 = ((Map) oldMap0);
-            }
-            if (urlMapReuse0 != (null)) {
-                urlMapReuse0 .clear();
-                urlMap0 = urlMapReuse0;
-            } else {
-                urlMap0 = new HashMap<URL, BigInteger>(((int)(((chunkLen1 * 4)+ 2)/ 3)));
-            }
+            urlMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(StringableRecord.get(6), ((int) chunkLen1)));
             do {
                 for (int counter1 = 0; (counter1 <chunkLen1); counter1 ++) {
                     URL key0 = new URL((decoder.readString()));
@@ -132,19 +122,19 @@ private void populate_StringableRecord2(com.linkedin.avro.fastserde.generated.av
                 chunkLen1 = (decoder.mapNext());
             } while (chunkLen1 > 0);
         } else {
-            urlMap0 = new HashMap<URL, BigInteger>(0);
+            urlMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(StringableRecord.get(6), 0));
         }
         StringableRecord.put(6, urlMap0);
     }
 
-    private void populate_StringableRecord3(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, Decoder decoder)
+    private void populate_StringableRecord3(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException, NumberFormatException, MalformedURLException, URISyntaxException
     {
-        StringableRecord.put(7, deserializeStringableSubRecord0(StringableRecord.get(7), (decoder)));
-        StringableRecord.put(8, deserializeAnotherSubRecord0(StringableRecord.get(8), (decoder)));
+        StringableRecord.put(7, deserializeStringableSubRecord0(StringableRecord.get(7), (decoder), (customization)));
+        StringableRecord.put(8, deserializeAnotherSubRecord0(StringableRecord.get(8), (decoder), (customization)));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.StringableSubRecord deserializeStringableSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.StringableSubRecord deserializeStringableSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException, URISyntaxException
     {
         com.linkedin.avro.fastserde.generated.avro.StringableSubRecord StringableSubRecord;
@@ -155,11 +145,11 @@ public com.linkedin.avro.fastserde.generated.avro.StringableSubRecord deserializ
         }
         URI charSequence7 = new URI((decoder.readString()));
         StringableSubRecord.put(0, charSequence7);
-        populate_StringableSubRecord0((StringableSubRecord), (decoder));
+        populate_StringableSubRecord0((StringableSubRecord), (customization), (decoder));
         return StringableSubRecord;
     }
 
-    private void populate_StringableSubRecord0(com.linkedin.avro.fastserde.generated.avro.StringableSubRecord StringableSubRecord, Decoder decoder)
+    private void populate_StringableSubRecord0(com.linkedin.avro.fastserde.generated.avro.StringableSubRecord StringableSubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException, URISyntaxException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -186,7 +176,7 @@ private void populate_StringableSubRecord0(com.linkedin.avro.fastserde.generated
         }
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.AnotherSubRecord deserializeAnotherSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.AnotherSubRecord deserializeAnotherSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException, URISyntaxException
     {
         com.linkedin.avro.fastserde.generated.avro.AnotherSubRecord AnotherSubRecord;
@@ -195,11 +185,11 @@ public com.linkedin.avro.fastserde.generated.avro.AnotherSubRecord deserializeAn
         } else {
             AnotherSubRecord = new com.linkedin.avro.fastserde.generated.avro.AnotherSubRecord();
         }
-        AnotherSubRecord.put(0, deserializeStringableSubRecord0(AnotherSubRecord.get(0), (decoder)));
+        AnotherSubRecord.put(0, deserializeStringableSubRecord0(AnotherSubRecord.get(0), (decoder), (customization)));
         return AnotherSubRecord;
     }
 
-    private void populate_StringableRecord4(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, Decoder decoder)
+    private void populate_StringableRecord4(com.linkedin.avro.fastserde.generated.avro.StringableRecord StringableRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException, NumberFormatException, MalformedURLException, URISyntaxException
     {
         int unionIndex1 = (decoder.readIndex());
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestArrayOfFloats_GenericDeserializer_1408566797_1408566797.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestArrayOfFloats_GenericDeserializer_1408566797_1408566797.java
index 6aa9a2730..2a793c7ee 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestArrayOfFloats_GenericDeserializer_1408566797_1408566797.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestArrayOfFloats_GenericDeserializer_1408566797_1408566797.java
@@ -5,6 +5,7 @@
 import com.linkedin.avro.api.PrimitiveFloatList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -21,13 +22,13 @@ public TestArrayOfFloats_GenericDeserializer_1408566797_1408566797(Schema reader
         this.array_of_float0 = readerSchema.getField("array_of_float").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeTestArrayOfFloats0((reuse), (decoder));
+        return deserializeTestArrayOfFloats0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeTestArrayOfFloats0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeTestArrayOfFloats0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord TestArrayOfFloats;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_GenericDeserializer_473555078_473555078.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_GenericDeserializer_473555078_473555078.java
index 0200ae69f..daf05e023 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_GenericDeserializer_473555078_473555078.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_GenericDeserializer_473555078_473555078.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -22,13 +22,13 @@ public TestRecord_GenericDeserializer_473555078_473555078(Schema readerSchema) {
         this.map_field0 = readerSchema.getField("map_field").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeTestRecord0((reuse), (decoder));
+        return deserializeTestRecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializeTestRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializeTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord TestRecord;
@@ -40,17 +40,7 @@ public IndexedRecord deserializeTestRecord0(Object reuse, Decoder decoder)
         Map<Utf8, Utf8> map_field1 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, Utf8> map_fieldReuse0 = null;
-            Object oldMap0 = TestRecord.get(0);
-            if (oldMap0 instanceof Map) {
-                map_fieldReuse0 = ((Map) oldMap0);
-            }
-            if (map_fieldReuse0 != (null)) {
-                map_fieldReuse0 .clear();
-                map_field1 = map_fieldReuse0;
-            } else {
-                map_field1 = new HashMap<Utf8, Utf8>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            map_field1 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(0), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
@@ -60,7 +50,7 @@ public IndexedRecord deserializeTestRecord0(Object reuse, Decoder decoder)
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            map_field1 = new HashMap<Utf8, Utf8>(0);
+            map_field1 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(0), 0));
         }
         TestRecord.put(0, map_field1);
         return TestRecord;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_1898726132_553331077.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_1898726132_553331077.java
index 80878a014..33a9bb40d 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_1898726132_553331077.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_1898726132_553331077.java
@@ -9,6 +9,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestFixed;
 import com.linkedin.avroutil1.Enums;
@@ -61,13 +62,13 @@ public TestRecord_SpecificDeserializer_1898726132_553331077(Schema readerSchema)
         this.enumMappingTestEnum3 = Collections.unmodifiableMap(tempEnumMapping3);
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.TestRecord reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.TestRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeTestRecord0((reuse), (decoder));
+        return deserializeTestRecord0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord;
@@ -77,23 +78,23 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
             TestRecord = new com.linkedin.avro.fastserde.generated.avro.TestRecord();
         }
         TestRecord.put(0, (decoder.readInt()));
-        populate_TestRecord0((TestRecord), (decoder));
-        populate_TestRecord1((TestRecord), (decoder));
-        populate_TestRecord2((TestRecord), (decoder));
-        populate_TestRecord3((TestRecord), (decoder));
-        populate_TestRecord4((TestRecord), (decoder));
-        populate_TestRecord5((TestRecord), (decoder));
-        populate_TestRecord6((TestRecord), (decoder));
-        populate_TestRecord7((TestRecord), (decoder));
-        populate_TestRecord8((TestRecord), (decoder));
-        populate_TestRecord9((TestRecord), (decoder));
-        populate_TestRecord10((TestRecord), (decoder));
-        populate_TestRecord11((TestRecord), (decoder));
-        populate_TestRecord12((TestRecord), (decoder));
-        populate_TestRecord13((TestRecord), (decoder));
-        populate_TestRecord14((TestRecord), (decoder));
-        populate_TestRecord15((TestRecord), (decoder));
-        populate_TestRecord16((TestRecord), (decoder));
+        populate_TestRecord0((TestRecord), (customization), (decoder));
+        populate_TestRecord1((TestRecord), (customization), (decoder));
+        populate_TestRecord2((TestRecord), (customization), (decoder));
+        populate_TestRecord3((TestRecord), (customization), (decoder));
+        populate_TestRecord4((TestRecord), (customization), (decoder));
+        populate_TestRecord5((TestRecord), (customization), (decoder));
+        populate_TestRecord6((TestRecord), (customization), (decoder));
+        populate_TestRecord7((TestRecord), (customization), (decoder));
+        populate_TestRecord8((TestRecord), (customization), (decoder));
+        populate_TestRecord9((TestRecord), (customization), (decoder));
+        populate_TestRecord10((TestRecord), (customization), (decoder));
+        populate_TestRecord11((TestRecord), (customization), (decoder));
+        populate_TestRecord12((TestRecord), (customization), (decoder));
+        populate_TestRecord13((TestRecord), (customization), (decoder));
+        populate_TestRecord14((TestRecord), (customization), (decoder));
+        populate_TestRecord15((TestRecord), (customization), (decoder));
+        populate_TestRecord16((TestRecord), (customization), (decoder));
         ArrayList<Boolean> defaultArray0 = new ArrayList<Boolean>();
         TestRecord.put(33, defaultArray0);
         ArrayList<Double> defaultArray1 = new ArrayList<Double>();
@@ -109,7 +110,7 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
         return TestRecord;
     }
 
-    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -126,7 +127,7 @@ private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(2, (decoder.readLong()));
     }
 
-    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -143,7 +144,7 @@ private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(4, (decoder.readDouble()));
     }
 
-    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -160,7 +161,7 @@ private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(6, (decoder.readFloat()));
     }
 
-    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -177,7 +178,7 @@ private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(8, (decoder.readBoolean()));
     }
 
-    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -201,7 +202,7 @@ private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(10, byteBuffer0);
     }
 
-    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -232,7 +233,7 @@ private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(12, charSequence0);
     }
 
-    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
@@ -265,7 +266,7 @@ private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.Tes
         }
     }
 
-    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         byte[] testFixed0;
@@ -302,7 +303,7 @@ private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.Tes
         }
     }
 
-    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericFixed> testFixedArray0 = null;
@@ -385,7 +386,7 @@ private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(17, testFixedUnionArray0);
     }
 
-    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int enumIndex0 = (decoder.readEnum());
@@ -426,7 +427,7 @@ private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.Tes
         }
     }
 
-    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<TestEnum> testEnumArray0 = null;
@@ -509,7 +510,7 @@ private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(21, testEnumUnionArray0);
     }
 
-    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex12 = (decoder.readIndex());
@@ -518,15 +519,15 @@ private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(22, null);
         } else {
             if (unionIndex12 == 1) {
-                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder)));
+                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecordUnion': "+ unionIndex12));
             }
         }
-        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder)));
+        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder), (customization)));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord;
@@ -553,11 +554,11 @@ public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord
                 throw new RuntimeException(("Illegal union index for 'subField': "+ unionIndex13));
             }
         }
-        populate_SubRecord0((SubRecord), (decoder));
+        populate_SubRecord0((SubRecord), (customization), (decoder));
         return SubRecord;
     }
 
-    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, Decoder decoder)
+    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex14 = (decoder.readIndex());
@@ -590,7 +591,7 @@ private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubR
         }
     }
 
-    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArray0 = null;
@@ -612,7 +613,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
                 if (oldArray4 instanceof GenericArray) {
                     recordsArrayArrayElementReuseVar0 = ((GenericArray) oldArray4).peek();
                 }
-                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder)));
+                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen4 = (decoder.arrayNext());
         }
@@ -620,31 +621,21 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMap0 = null;
         long chunkLen5 = (decoder.readMapStart());
         if (chunkLen5 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapReuse0 = null;
-            Object oldMap0 = TestRecord.get(25);
-            if (oldMap0 instanceof Map) {
-                recordsMapReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapReuse0 != (null)) {
-                recordsMapReuse0 .clear();
-                recordsMap0 = recordsMapReuse0;
-            } else {
-                recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen5 * 4)+ 2)/ 3)));
-            }
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), ((int) chunkLen5)));
             do {
                 for (int counter5 = 0; (counter5 <chunkLen5); counter5 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder)));
+                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen5 = (decoder.mapNext());
             } while (chunkLen5 > 0);
         } else {
-            recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), 0));
         }
         TestRecord.put(25, recordsMap0);
     }
 
-    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex16 = (decoder.readIndex());
@@ -678,7 +669,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                             recordsArrayUnionOption0 .add(null);
                         } else {
                             if (unionIndex17 == 1) {
-                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder)));
+                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder), (customization)));
                             } else {
                                 throw new RuntimeException(("Illegal union index for 'recordsArrayUnionOptionElem': "+ unionIndex17));
                             }
@@ -700,17 +691,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOption0 = null;
                 long chunkLen7 = (decoder.readMapStart());
                 if (chunkLen7 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOptionReuse0 = null;
-                    Object oldMap1 = TestRecord.get(27);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapUnionOptionReuse0 != (null)) {
-                        recordsMapUnionOptionReuse0 .clear();
-                        recordsMapUnionOption0 = recordsMapUnionOptionReuse0;
-                    } else {
-                        recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen7 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), ((int) chunkLen7)));
                     do {
                         for (int counter7 = 0; (counter7 <chunkLen7); counter7 ++) {
                             Utf8 key1 = (decoder.readString(null));
@@ -720,7 +701,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapUnionOption0 .put(key1, null);
                             } else {
                                 if (unionIndex19 == 1) {
-                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder)));
+                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapUnionOptionValue': "+ unionIndex19));
                                 }
@@ -729,7 +710,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen7 = (decoder.mapNext());
                     } while (chunkLen7 > 0);
                 } else {
-                    recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), 0));
                 }
                 TestRecord.put(27, recordsMapUnionOption0);
             } else {
@@ -738,7 +719,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsArrayMap0 = null;
@@ -763,16 +744,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElem0 = null;
                 long chunkLen9 = (decoder.readMapStart());
                 if (chunkLen9 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElemReuse0 = null;
-                    if (recordsArrayMapArrayElementReuseVar0 instanceof Map) {
-                        recordsArrayMapElemReuse0 = ((Map) recordsArrayMapArrayElementReuseVar0);
-                    }
-                    if (recordsArrayMapElemReuse0 != (null)) {
-                        recordsArrayMapElemReuse0 .clear();
-                        recordsArrayMapElem0 = recordsArrayMapElemReuse0;
-                    } else {
-                        recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen9 * 4)+ 2)/ 3)));
-                    }
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, ((int) chunkLen9)));
                     do {
                         for (int counter9 = 0; (counter9 <chunkLen9); counter9 ++) {
                             Utf8 key2 = (decoder.readString(null));
@@ -782,7 +754,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsArrayMapElem0 .put(key2, null);
                             } else {
                                 if (unionIndex20 == 1) {
-                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder)));
+                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsArrayMapElemValue': "+ unionIndex20));
                                 }
@@ -791,7 +763,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen9 = (decoder.mapNext());
                     } while (chunkLen9 > 0);
                 } else {
-                    recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, 0));
                 }
                 recordsArrayMap0 .add(recordsArrayMapElem0);
             }
@@ -801,17 +773,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
         Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArray0 = null;
         long chunkLen10 = (decoder.readMapStart());
         if (chunkLen10 > 0) {
-            Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayReuse0 = null;
-            Object oldMap2 = TestRecord.get(29);
-            if (oldMap2 instanceof Map) {
-                recordsMapArrayReuse0 = ((Map) oldMap2);
-            }
-            if (recordsMapArrayReuse0 != (null)) {
-                recordsMapArrayReuse0 .clear();
-                recordsMapArray0 = recordsMapArrayReuse0;
-            } else {
-                recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen10 * 4)+ 2)/ 3)));
-            }
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), ((int) chunkLen10)));
             do {
                 for (int counter10 = 0; (counter10 <chunkLen10); counter10 ++) {
                     Utf8 key3 = (decoder.readString(null));
@@ -839,7 +801,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapArrayValue0 .add(null);
                             } else {
                                 if (unionIndex21 == 1) {
-                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder)));
+                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapArrayValueElem': "+ unionIndex21));
                                 }
@@ -852,12 +814,12 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 chunkLen10 = (decoder.mapNext());
             } while (chunkLen10 > 0);
         } else {
-            recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), 0));
         }
         TestRecord.put(29, recordsMapArray0);
     }
 
-    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex22 = (decoder.readIndex());
@@ -888,16 +850,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElem0 = null;
                         long chunkLen13 = (decoder.readMapStart());
                         if (chunkLen13 > 0) {
-                            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElemReuse0 = null;
-                            if (recordsArrayMapUnionOptionArrayElementReuseVar0 instanceof Map) {
-                                recordsArrayMapUnionOptionElemReuse0 = ((Map) recordsArrayMapUnionOptionArrayElementReuseVar0);
-                            }
-                            if (recordsArrayMapUnionOptionElemReuse0 != (null)) {
-                                recordsArrayMapUnionOptionElemReuse0 .clear();
-                                recordsArrayMapUnionOptionElem0 = recordsArrayMapUnionOptionElemReuse0;
-                            } else {
-                                recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen13 * 4)+ 2)/ 3)));
-                            }
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, ((int) chunkLen13)));
                             do {
                                 for (int counter13 = 0; (counter13 <chunkLen13); counter13 ++) {
                                     Utf8 key4 = (decoder.readString(null));
@@ -907,7 +860,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsArrayMapUnionOptionElem0 .put(key4, null);
                                     } else {
                                         if (unionIndex23 == 1) {
-                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder)));
+                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsArrayMapUnionOptionElemValue': "+ unionIndex23));
                                         }
@@ -916,7 +869,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                 chunkLen13 = (decoder.mapNext());
                             } while (chunkLen13 > 0);
                         } else {
-                            recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, 0));
                         }
                         recordsArrayMapUnionOption0 .add(recordsArrayMapUnionOptionElem0);
                     }
@@ -936,17 +889,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOption0 = null;
                 long chunkLen14 = (decoder.readMapStart());
                 if (chunkLen14 > 0) {
-                    Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOptionReuse0 = null;
-                    Object oldMap3 = TestRecord.get(31);
-                    if (oldMap3 instanceof Map) {
-                        recordsMapArrayUnionOptionReuse0 = ((Map) oldMap3);
-                    }
-                    if (recordsMapArrayUnionOptionReuse0 != (null)) {
-                        recordsMapArrayUnionOptionReuse0 .clear();
-                        recordsMapArrayUnionOption0 = recordsMapArrayUnionOptionReuse0;
-                    } else {
-                        recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen14 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), ((int) chunkLen14)));
                     do {
                         for (int counter14 = 0; (counter14 <chunkLen14); counter14 ++) {
                             Utf8 key5 = (decoder.readString(null));
@@ -974,7 +917,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsMapArrayUnionOptionValue0 .add(null);
                                     } else {
                                         if (unionIndex25 == 1) {
-                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder)));
+                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsMapArrayUnionOptionValueElem': "+ unionIndex25));
                                         }
@@ -987,7 +930,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen14 = (decoder.mapNext());
                     } while (chunkLen14 > 0);
                 } else {
-                    recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), 0));
                 }
                 TestRecord.put(31, recordsMapArrayUnionOption0);
             } else {
@@ -996,7 +939,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex26 = (decoder.readIndex());
@@ -1005,7 +948,7 @@ private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(32, null);
         } else {
             if (unionIndex26 == 1) {
-                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder)));
+                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder), (customization)));
             } else {
                 if (unionIndex26 == 2) {
                     Utf8 charSequence4;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_1991094399_553331077.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_1991094399_553331077.java
index 4fb1c2f90..d50d85c7c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_1991094399_553331077.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_1991094399_553331077.java
@@ -9,6 +9,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestFixed;
 import com.linkedin.avroutil1.Enums;
@@ -65,13 +66,13 @@ public TestRecord_SpecificDeserializer_1991094399_553331077(Schema readerSchema)
         this.enumMappingTestEnum3 = Collections.unmodifiableMap(tempEnumMapping3);
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.TestRecord reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.TestRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeTestRecord0((reuse), (decoder));
+        return deserializeTestRecord0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord;
@@ -81,23 +82,23 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
             TestRecord = new com.linkedin.avro.fastserde.generated.avro.TestRecord();
         }
         TestRecord.put(0, (decoder.readInt()));
-        populate_TestRecord0((TestRecord), (decoder));
-        populate_TestRecord1((TestRecord), (decoder));
-        populate_TestRecord2((TestRecord), (decoder));
-        populate_TestRecord3((TestRecord), (decoder));
-        populate_TestRecord4((TestRecord), (decoder));
-        populate_TestRecord5((TestRecord), (decoder));
-        populate_TestRecord6((TestRecord), (decoder));
-        populate_TestRecord7((TestRecord), (decoder));
-        populate_TestRecord8((TestRecord), (decoder));
-        populate_TestRecord9((TestRecord), (decoder));
-        populate_TestRecord10((TestRecord), (decoder));
-        populate_TestRecord11((TestRecord), (decoder));
-        populate_TestRecord12((TestRecord), (decoder));
-        populate_TestRecord13((TestRecord), (decoder));
-        populate_TestRecord14((TestRecord), (decoder));
-        populate_TestRecord15((TestRecord), (decoder));
-        populate_TestRecord16((TestRecord), (decoder));
+        populate_TestRecord0((TestRecord), (customization), (decoder));
+        populate_TestRecord1((TestRecord), (customization), (decoder));
+        populate_TestRecord2((TestRecord), (customization), (decoder));
+        populate_TestRecord3((TestRecord), (customization), (decoder));
+        populate_TestRecord4((TestRecord), (customization), (decoder));
+        populate_TestRecord5((TestRecord), (customization), (decoder));
+        populate_TestRecord6((TestRecord), (customization), (decoder));
+        populate_TestRecord7((TestRecord), (customization), (decoder));
+        populate_TestRecord8((TestRecord), (customization), (decoder));
+        populate_TestRecord9((TestRecord), (customization), (decoder));
+        populate_TestRecord10((TestRecord), (customization), (decoder));
+        populate_TestRecord11((TestRecord), (customization), (decoder));
+        populate_TestRecord12((TestRecord), (customization), (decoder));
+        populate_TestRecord13((TestRecord), (customization), (decoder));
+        populate_TestRecord14((TestRecord), (customization), (decoder));
+        populate_TestRecord15((TestRecord), (customization), (decoder));
+        populate_TestRecord16((TestRecord), (customization), (decoder));
         ArrayList<Boolean> defaultArray0 = new ArrayList<Boolean>();
         TestRecord.put(33, defaultArray0);
         ArrayList<Double> defaultArray1 = new ArrayList<Double>();
@@ -113,7 +114,7 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
         return TestRecord;
     }
 
-    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -130,7 +131,7 @@ private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(2, (decoder.readLong()));
     }
 
-    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -147,7 +148,7 @@ private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(4, (decoder.readDouble()));
     }
 
-    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -164,7 +165,7 @@ private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(6, (decoder.readFloat()));
     }
 
-    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -181,7 +182,7 @@ private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(8, (decoder.readBoolean()));
     }
 
-    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -205,7 +206,7 @@ private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(10, byteBuffer0);
     }
 
-    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -236,7 +237,7 @@ private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(12, charSequence0);
     }
 
-    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
@@ -269,7 +270,7 @@ private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.Tes
         }
     }
 
-    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         byte[] testFixed0;
@@ -306,7 +307,7 @@ private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.Tes
         }
     }
 
-    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericFixed> testFixedArray0 = null;
@@ -389,7 +390,7 @@ private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(17, testFixedUnionArray0);
     }
 
-    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int enumIndex0 = (decoder.readEnum());
@@ -430,7 +431,7 @@ private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.Tes
         }
     }
 
-    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<TestEnum> testEnumArray0 = null;
@@ -513,7 +514,7 @@ private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(21, testEnumUnionArray0);
     }
 
-    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex12 = (decoder.readIndex());
@@ -522,15 +523,15 @@ private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(22, null);
         } else {
             if (unionIndex12 == 1) {
-                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder)));
+                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecordUnion': "+ unionIndex12));
             }
         }
-        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder)));
+        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder), (customization)));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord;
@@ -557,11 +558,11 @@ public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord
                 throw new RuntimeException(("Illegal union index for 'subField': "+ unionIndex13));
             }
         }
-        populate_SubRecord0((SubRecord), (decoder));
+        populate_SubRecord0((SubRecord), (customization), (decoder));
         return SubRecord;
     }
 
-    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, Decoder decoder)
+    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex14 = (decoder.readIndex());
@@ -594,7 +595,7 @@ private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubR
         }
     }
 
-    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArray0 = null;
@@ -616,7 +617,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
                 if (oldArray4 instanceof GenericArray) {
                     recordsArrayArrayElementReuseVar0 = ((GenericArray) oldArray4).peek();
                 }
-                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder)));
+                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen4 = (decoder.arrayNext());
         }
@@ -624,31 +625,21 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMap0 = null;
         long chunkLen5 = (decoder.readMapStart());
         if (chunkLen5 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapReuse0 = null;
-            Object oldMap0 = TestRecord.get(25);
-            if (oldMap0 instanceof Map) {
-                recordsMapReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapReuse0 != (null)) {
-                recordsMapReuse0 .clear();
-                recordsMap0 = recordsMapReuse0;
-            } else {
-                recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen5 * 4)+ 2)/ 3)));
-            }
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), ((int) chunkLen5)));
             do {
                 for (int counter5 = 0; (counter5 <chunkLen5); counter5 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder)));
+                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen5 = (decoder.mapNext());
             } while (chunkLen5 > 0);
         } else {
-            recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), 0));
         }
         TestRecord.put(25, recordsMap0);
     }
 
-    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex16 = (decoder.readIndex());
@@ -682,7 +673,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                             recordsArrayUnionOption0 .add(null);
                         } else {
                             if (unionIndex17 == 1) {
-                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder)));
+                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder), (customization)));
                             } else {
                                 throw new RuntimeException(("Illegal union index for 'recordsArrayUnionOptionElem': "+ unionIndex17));
                             }
@@ -704,17 +695,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOption0 = null;
                 long chunkLen7 = (decoder.readMapStart());
                 if (chunkLen7 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOptionReuse0 = null;
-                    Object oldMap1 = TestRecord.get(27);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapUnionOptionReuse0 != (null)) {
-                        recordsMapUnionOptionReuse0 .clear();
-                        recordsMapUnionOption0 = recordsMapUnionOptionReuse0;
-                    } else {
-                        recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen7 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), ((int) chunkLen7)));
                     do {
                         for (int counter7 = 0; (counter7 <chunkLen7); counter7 ++) {
                             Utf8 key1 = (decoder.readString(null));
@@ -724,7 +705,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapUnionOption0 .put(key1, null);
                             } else {
                                 if (unionIndex19 == 1) {
-                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder)));
+                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapUnionOptionValue': "+ unionIndex19));
                                 }
@@ -733,7 +714,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen7 = (decoder.mapNext());
                     } while (chunkLen7 > 0);
                 } else {
-                    recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), 0));
                 }
                 TestRecord.put(27, recordsMapUnionOption0);
             } else {
@@ -742,7 +723,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsArrayMap0 = null;
@@ -767,16 +748,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElem0 = null;
                 long chunkLen9 = (decoder.readMapStart());
                 if (chunkLen9 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElemReuse0 = null;
-                    if (recordsArrayMapArrayElementReuseVar0 instanceof Map) {
-                        recordsArrayMapElemReuse0 = ((Map) recordsArrayMapArrayElementReuseVar0);
-                    }
-                    if (recordsArrayMapElemReuse0 != (null)) {
-                        recordsArrayMapElemReuse0 .clear();
-                        recordsArrayMapElem0 = recordsArrayMapElemReuse0;
-                    } else {
-                        recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen9 * 4)+ 2)/ 3)));
-                    }
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, ((int) chunkLen9)));
                     do {
                         for (int counter9 = 0; (counter9 <chunkLen9); counter9 ++) {
                             Utf8 key2 = (decoder.readString(null));
@@ -786,7 +758,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsArrayMapElem0 .put(key2, null);
                             } else {
                                 if (unionIndex20 == 1) {
-                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder)));
+                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsArrayMapElemValue': "+ unionIndex20));
                                 }
@@ -795,7 +767,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen9 = (decoder.mapNext());
                     } while (chunkLen9 > 0);
                 } else {
-                    recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, 0));
                 }
                 recordsArrayMap0 .add(recordsArrayMapElem0);
             }
@@ -805,17 +777,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
         Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArray0 = null;
         long chunkLen10 = (decoder.readMapStart());
         if (chunkLen10 > 0) {
-            Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayReuse0 = null;
-            Object oldMap2 = TestRecord.get(29);
-            if (oldMap2 instanceof Map) {
-                recordsMapArrayReuse0 = ((Map) oldMap2);
-            }
-            if (recordsMapArrayReuse0 != (null)) {
-                recordsMapArrayReuse0 .clear();
-                recordsMapArray0 = recordsMapArrayReuse0;
-            } else {
-                recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen10 * 4)+ 2)/ 3)));
-            }
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), ((int) chunkLen10)));
             do {
                 for (int counter10 = 0; (counter10 <chunkLen10); counter10 ++) {
                     Utf8 key3 = (decoder.readString(null));
@@ -843,7 +805,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapArrayValue0 .add(null);
                             } else {
                                 if (unionIndex21 == 1) {
-                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder)));
+                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapArrayValueElem': "+ unionIndex21));
                                 }
@@ -856,12 +818,12 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 chunkLen10 = (decoder.mapNext());
             } while (chunkLen10 > 0);
         } else {
-            recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), 0));
         }
         TestRecord.put(29, recordsMapArray0);
     }
 
-    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex22 = (decoder.readIndex());
@@ -892,16 +854,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElem0 = null;
                         long chunkLen13 = (decoder.readMapStart());
                         if (chunkLen13 > 0) {
-                            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElemReuse0 = null;
-                            if (recordsArrayMapUnionOptionArrayElementReuseVar0 instanceof Map) {
-                                recordsArrayMapUnionOptionElemReuse0 = ((Map) recordsArrayMapUnionOptionArrayElementReuseVar0);
-                            }
-                            if (recordsArrayMapUnionOptionElemReuse0 != (null)) {
-                                recordsArrayMapUnionOptionElemReuse0 .clear();
-                                recordsArrayMapUnionOptionElem0 = recordsArrayMapUnionOptionElemReuse0;
-                            } else {
-                                recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen13 * 4)+ 2)/ 3)));
-                            }
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, ((int) chunkLen13)));
                             do {
                                 for (int counter13 = 0; (counter13 <chunkLen13); counter13 ++) {
                                     Utf8 key4 = (decoder.readString(null));
@@ -911,7 +864,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsArrayMapUnionOptionElem0 .put(key4, null);
                                     } else {
                                         if (unionIndex23 == 1) {
-                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder)));
+                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsArrayMapUnionOptionElemValue': "+ unionIndex23));
                                         }
@@ -920,7 +873,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                 chunkLen13 = (decoder.mapNext());
                             } while (chunkLen13 > 0);
                         } else {
-                            recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, 0));
                         }
                         recordsArrayMapUnionOption0 .add(recordsArrayMapUnionOptionElem0);
                     }
@@ -940,17 +893,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOption0 = null;
                 long chunkLen14 = (decoder.readMapStart());
                 if (chunkLen14 > 0) {
-                    Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOptionReuse0 = null;
-                    Object oldMap3 = TestRecord.get(31);
-                    if (oldMap3 instanceof Map) {
-                        recordsMapArrayUnionOptionReuse0 = ((Map) oldMap3);
-                    }
-                    if (recordsMapArrayUnionOptionReuse0 != (null)) {
-                        recordsMapArrayUnionOptionReuse0 .clear();
-                        recordsMapArrayUnionOption0 = recordsMapArrayUnionOptionReuse0;
-                    } else {
-                        recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen14 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), ((int) chunkLen14)));
                     do {
                         for (int counter14 = 0; (counter14 <chunkLen14); counter14 ++) {
                             Utf8 key5 = (decoder.readString(null));
@@ -978,7 +921,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsMapArrayUnionOptionValue0 .add(null);
                                     } else {
                                         if (unionIndex25 == 1) {
-                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder)));
+                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsMapArrayUnionOptionValueElem': "+ unionIndex25));
                                         }
@@ -991,7 +934,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen14 = (decoder.mapNext());
                     } while (chunkLen14 > 0);
                 } else {
-                    recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), 0));
                 }
                 TestRecord.put(31, recordsMapArrayUnionOption0);
             } else {
@@ -1000,7 +943,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex26 = (decoder.readIndex());
@@ -1009,7 +952,7 @@ private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(32, null);
         } else {
             if (unionIndex26 == 1) {
-                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder)));
+                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder), (customization)));
             } else {
                 if (unionIndex26 == 2) {
                     Utf8 charSequence4;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_553331077_553331077.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_553331077_553331077.java
index 0a2b911d9..7ceb9cf07 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_553331077_553331077.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/TestRecord_SpecificDeserializer_553331077_553331077.java
@@ -4,7 +4,6 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.api.PrimitiveBooleanList;
@@ -14,6 +13,7 @@
 import com.linkedin.avro.api.PrimitiveLongList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.TestEnum;
 import com.linkedin.avro.fastserde.generated.avro.TestFixed;
 import com.linkedin.avro.fastserde.primitive.PrimitiveBooleanArrayList;
@@ -37,13 +37,13 @@ public TestRecord_SpecificDeserializer_553331077_553331077(Schema readerSchema)
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.TestRecord reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserialize(com.linkedin.avro.fastserde.generated.avro.TestRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeTestRecord0((reuse), (decoder));
+        return deserializeTestRecord0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord;
@@ -53,29 +53,29 @@ public com.linkedin.avro.fastserde.generated.avro.TestRecord deserializeTestReco
             TestRecord = new com.linkedin.avro.fastserde.generated.avro.TestRecord();
         }
         TestRecord.put(0, (decoder.readInt()));
-        populate_TestRecord0((TestRecord), (decoder));
-        populate_TestRecord1((TestRecord), (decoder));
-        populate_TestRecord2((TestRecord), (decoder));
-        populate_TestRecord3((TestRecord), (decoder));
-        populate_TestRecord4((TestRecord), (decoder));
-        populate_TestRecord5((TestRecord), (decoder));
-        populate_TestRecord6((TestRecord), (decoder));
-        populate_TestRecord7((TestRecord), (decoder));
-        populate_TestRecord8((TestRecord), (decoder));
-        populate_TestRecord9((TestRecord), (decoder));
-        populate_TestRecord10((TestRecord), (decoder));
-        populate_TestRecord11((TestRecord), (decoder));
-        populate_TestRecord12((TestRecord), (decoder));
-        populate_TestRecord13((TestRecord), (decoder));
-        populate_TestRecord14((TestRecord), (decoder));
-        populate_TestRecord15((TestRecord), (decoder));
-        populate_TestRecord16((TestRecord), (decoder));
-        populate_TestRecord17((TestRecord), (decoder));
-        populate_TestRecord18((TestRecord), (decoder));
+        populate_TestRecord0((TestRecord), (customization), (decoder));
+        populate_TestRecord1((TestRecord), (customization), (decoder));
+        populate_TestRecord2((TestRecord), (customization), (decoder));
+        populate_TestRecord3((TestRecord), (customization), (decoder));
+        populate_TestRecord4((TestRecord), (customization), (decoder));
+        populate_TestRecord5((TestRecord), (customization), (decoder));
+        populate_TestRecord6((TestRecord), (customization), (decoder));
+        populate_TestRecord7((TestRecord), (customization), (decoder));
+        populate_TestRecord8((TestRecord), (customization), (decoder));
+        populate_TestRecord9((TestRecord), (customization), (decoder));
+        populate_TestRecord10((TestRecord), (customization), (decoder));
+        populate_TestRecord11((TestRecord), (customization), (decoder));
+        populate_TestRecord12((TestRecord), (customization), (decoder));
+        populate_TestRecord13((TestRecord), (customization), (decoder));
+        populate_TestRecord14((TestRecord), (customization), (decoder));
+        populate_TestRecord15((TestRecord), (customization), (decoder));
+        populate_TestRecord16((TestRecord), (customization), (decoder));
+        populate_TestRecord17((TestRecord), (customization), (decoder));
+        populate_TestRecord18((TestRecord), (customization), (decoder));
         return TestRecord;
     }
 
-    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -92,7 +92,7 @@ private void populate_TestRecord0(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(2, (decoder.readLong()));
     }
 
-    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex1 = (decoder.readIndex());
@@ -109,7 +109,7 @@ private void populate_TestRecord1(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(4, (decoder.readDouble()));
     }
 
-    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex2 = (decoder.readIndex());
@@ -126,7 +126,7 @@ private void populate_TestRecord2(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(6, (decoder.readFloat()));
     }
 
-    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex3 = (decoder.readIndex());
@@ -143,7 +143,7 @@ private void populate_TestRecord3(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(8, (decoder.readBoolean()));
     }
 
-    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex4 = (decoder.readIndex());
@@ -167,7 +167,7 @@ private void populate_TestRecord4(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(10, byteBuffer0);
     }
 
-    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex5 = (decoder.readIndex());
@@ -198,7 +198,7 @@ private void populate_TestRecord5(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(12, charSequence0);
     }
 
-    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex6 = (decoder.readIndex());
@@ -232,7 +232,7 @@ private void populate_TestRecord6(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(14, testFixed1);
     }
 
-    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex7 = (decoder.readIndex());
@@ -292,7 +292,7 @@ private void populate_TestRecord7(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(16, testFixedArray0);
     }
 
-    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<GenericFixed> testFixedUnionArray0 = null;
@@ -342,7 +342,7 @@ private void populate_TestRecord8(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(18, Enums.getConstant(TestEnum.class, (decoder.readEnum())));
     }
 
-    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex9 = (decoder.readIndex());
@@ -378,7 +378,7 @@ private void populate_TestRecord9(com.linkedin.avro.fastserde.generated.avro.Tes
         TestRecord.put(20, testEnumArray0);
     }
 
-    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         List<TestEnum> testEnumUnionArray0 = null;
@@ -421,14 +421,14 @@ private void populate_TestRecord10(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(22, null);
         } else {
             if (unionIndex11 == 1) {
-                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder)));
+                TestRecord.put(22, deserializeSubRecord0(TestRecord.get(22), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecordUnion': "+ unionIndex11));
             }
         }
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord;
@@ -455,11 +455,11 @@ public com.linkedin.avro.fastserde.generated.avro.SubRecord deserializeSubRecord
                 throw new RuntimeException(("Illegal union index for 'subField': "+ unionIndex12));
             }
         }
-        populate_SubRecord0((SubRecord), (decoder));
+        populate_SubRecord0((SubRecord), (customization), (decoder));
         return SubRecord;
     }
 
-    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, Decoder decoder)
+    private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubRecord SubRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex13 = (decoder.readIndex());
@@ -482,10 +482,10 @@ private void populate_SubRecord0(com.linkedin.avro.fastserde.generated.avro.SubR
         }
     }
 
-    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
-        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder)));
+        TestRecord.put(23, deserializeSubRecord0(TestRecord.get(23), (decoder), (customization)));
         List<com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArray0 = null;
         long chunkLen4 = (decoder.readArrayStart());
         Object oldArray4 = TestRecord.get(24);
@@ -505,39 +505,29 @@ private void populate_TestRecord11(com.linkedin.avro.fastserde.generated.avro.Te
                 if (oldArray4 instanceof GenericArray) {
                     recordsArrayArrayElementReuseVar0 = ((GenericArray) oldArray4).peek();
                 }
-                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder)));
+                recordsArray0 .add(deserializeSubRecord0(recordsArrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen4 = (decoder.arrayNext());
         }
         TestRecord.put(24, recordsArray0);
     }
 
-    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMap0 = null;
         long chunkLen5 = (decoder.readMapStart());
         if (chunkLen5 > 0) {
-            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapReuse0 = null;
-            Object oldMap0 = TestRecord.get(25);
-            if (oldMap0 instanceof Map) {
-                recordsMapReuse0 = ((Map) oldMap0);
-            }
-            if (recordsMapReuse0 != (null)) {
-                recordsMapReuse0 .clear();
-                recordsMap0 = recordsMapReuse0;
-            } else {
-                recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen5 * 4)+ 2)/ 3)));
-            }
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), ((int) chunkLen5)));
             do {
                 for (int counter5 = 0; (counter5 <chunkLen5); counter5 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder)));
+                    recordsMap0 .put(key0, deserializeSubRecord0(null, (decoder), (customization)));
                 }
                 chunkLen5 = (decoder.mapNext());
             } while (chunkLen5 > 0);
         } else {
-            recordsMap0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+            recordsMap0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(25), 0));
         }
         TestRecord.put(25, recordsMap0);
         int unionIndex14 = (decoder.readIndex());
@@ -571,7 +561,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
                             recordsArrayUnionOption0 .add(null);
                         } else {
                             if (unionIndex15 == 1) {
-                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder)));
+                                recordsArrayUnionOption0 .add(deserializeSubRecord0(recordsArrayUnionOptionArrayElementReuseVar0, (decoder), (customization)));
                             } else {
                                 throw new RuntimeException(("Illegal union index for 'recordsArrayUnionOptionElem': "+ unionIndex15));
                             }
@@ -586,7 +576,7 @@ private void populate_TestRecord12(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex16 = (decoder.readIndex());
@@ -598,17 +588,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOption0 = null;
                 long chunkLen7 = (decoder.readMapStart());
                 if (chunkLen7 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsMapUnionOptionReuse0 = null;
-                    Object oldMap1 = TestRecord.get(27);
-                    if (oldMap1 instanceof Map) {
-                        recordsMapUnionOptionReuse0 = ((Map) oldMap1);
-                    }
-                    if (recordsMapUnionOptionReuse0 != (null)) {
-                        recordsMapUnionOptionReuse0 .clear();
-                        recordsMapUnionOption0 = recordsMapUnionOptionReuse0;
-                    } else {
-                        recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen7 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), ((int) chunkLen7)));
                     do {
                         for (int counter7 = 0; (counter7 <chunkLen7); counter7 ++) {
                             Utf8 key1 = (decoder.readString(null));
@@ -618,7 +598,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapUnionOption0 .put(key1, null);
                             } else {
                                 if (unionIndex17 == 1) {
-                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder)));
+                                    recordsMapUnionOption0 .put(key1, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapUnionOptionValue': "+ unionIndex17));
                                 }
@@ -627,7 +607,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen7 = (decoder.mapNext());
                     } while (chunkLen7 > 0);
                 } else {
-                    recordsMapUnionOption0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsMapUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(27), 0));
                 }
                 TestRecord.put(27, recordsMapUnionOption0);
             } else {
@@ -656,16 +636,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElem0 = null;
                 long chunkLen9 = (decoder.readMapStart());
                 if (chunkLen9 > 0) {
-                    Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapElemReuse0 = null;
-                    if (recordsArrayMapArrayElementReuseVar0 instanceof Map) {
-                        recordsArrayMapElemReuse0 = ((Map) recordsArrayMapArrayElementReuseVar0);
-                    }
-                    if (recordsArrayMapElemReuse0 != (null)) {
-                        recordsArrayMapElemReuse0 .clear();
-                        recordsArrayMapElem0 = recordsArrayMapElemReuse0;
-                    } else {
-                        recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen9 * 4)+ 2)/ 3)));
-                    }
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, ((int) chunkLen9)));
                     do {
                         for (int counter9 = 0; (counter9 <chunkLen9); counter9 ++) {
                             Utf8 key2 = (decoder.readString(null));
@@ -675,7 +646,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsArrayMapElem0 .put(key2, null);
                             } else {
                                 if (unionIndex18 == 1) {
-                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder)));
+                                    recordsArrayMapElem0 .put(key2, deserializeSubRecord0(null, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsArrayMapElemValue': "+ unionIndex18));
                                 }
@@ -684,7 +655,7 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen9 = (decoder.mapNext());
                     } while (chunkLen9 > 0);
                 } else {
-                    recordsArrayMapElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                    recordsArrayMapElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapArrayElementReuseVar0, 0));
                 }
                 recordsArrayMap0 .add(recordsArrayMapElem0);
             }
@@ -693,23 +664,13 @@ private void populate_TestRecord13(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(28, recordsArrayMap0);
     }
 
-    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArray0 = null;
         long chunkLen10 = (decoder.readMapStart());
         if (chunkLen10 > 0) {
-            Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayReuse0 = null;
-            Object oldMap2 = TestRecord.get(29);
-            if (oldMap2 instanceof Map) {
-                recordsMapArrayReuse0 = ((Map) oldMap2);
-            }
-            if (recordsMapArrayReuse0 != (null)) {
-                recordsMapArrayReuse0 .clear();
-                recordsMapArray0 = recordsMapArrayReuse0;
-            } else {
-                recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen10 * 4)+ 2)/ 3)));
-            }
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), ((int) chunkLen10)));
             do {
                 for (int counter10 = 0; (counter10 <chunkLen10); counter10 ++) {
                     Utf8 key3 = (decoder.readString(null));
@@ -737,7 +698,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 recordsMapArrayValue0 .add(null);
                             } else {
                                 if (unionIndex19 == 1) {
-                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder)));
+                                    recordsMapArrayValue0 .add(deserializeSubRecord0(recordsMapArrayValueArrayElementReuseVar0, (decoder), (customization)));
                                 } else {
                                     throw new RuntimeException(("Illegal union index for 'recordsMapArrayValueElem': "+ unionIndex19));
                                 }
@@ -750,7 +711,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                 chunkLen10 = (decoder.mapNext());
             } while (chunkLen10 > 0);
         } else {
-            recordsMapArray0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+            recordsMapArray0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(29), 0));
         }
         TestRecord.put(29, recordsMapArray0);
         int unionIndex20 = (decoder.readIndex());
@@ -781,16 +742,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                         Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElem0 = null;
                         long chunkLen13 = (decoder.readMapStart());
                         if (chunkLen13 > 0) {
-                            Map<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord> recordsArrayMapUnionOptionElemReuse0 = null;
-                            if (recordsArrayMapUnionOptionArrayElementReuseVar0 instanceof Map) {
-                                recordsArrayMapUnionOptionElemReuse0 = ((Map) recordsArrayMapUnionOptionArrayElementReuseVar0);
-                            }
-                            if (recordsArrayMapUnionOptionElemReuse0 != (null)) {
-                                recordsArrayMapUnionOptionElemReuse0 .clear();
-                                recordsArrayMapUnionOptionElem0 = recordsArrayMapUnionOptionElemReuse0;
-                            } else {
-                                recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(((int)(((chunkLen13 * 4)+ 2)/ 3)));
-                            }
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, ((int) chunkLen13)));
                             do {
                                 for (int counter13 = 0; (counter13 <chunkLen13); counter13 ++) {
                                     Utf8 key4 = (decoder.readString(null));
@@ -800,7 +752,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsArrayMapUnionOptionElem0 .put(key4, null);
                                     } else {
                                         if (unionIndex21 == 1) {
-                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder)));
+                                            recordsArrayMapUnionOptionElem0 .put(key4, deserializeSubRecord0(null, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsArrayMapUnionOptionElemValue': "+ unionIndex21));
                                         }
@@ -809,7 +761,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
                                 chunkLen13 = (decoder.mapNext());
                             } while (chunkLen13 > 0);
                         } else {
-                            recordsArrayMapUnionOptionElem0 = new HashMap<Utf8, com.linkedin.avro.fastserde.generated.avro.SubRecord>(0);
+                            recordsArrayMapUnionOptionElem0 = ((Map)(customization).getNewMapOverrideFunc().apply(recordsArrayMapUnionOptionArrayElementReuseVar0, 0));
                         }
                         recordsArrayMapUnionOption0 .add(recordsArrayMapUnionOptionElem0);
                     }
@@ -822,7 +774,7 @@ private void populate_TestRecord14(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex22 = (decoder.readIndex());
@@ -834,17 +786,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                 Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOption0 = null;
                 long chunkLen14 = (decoder.readMapStart());
                 if (chunkLen14 > 0) {
-                    Map<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>> recordsMapArrayUnionOptionReuse0 = null;
-                    Object oldMap3 = TestRecord.get(31);
-                    if (oldMap3 instanceof Map) {
-                        recordsMapArrayUnionOptionReuse0 = ((Map) oldMap3);
-                    }
-                    if (recordsMapArrayUnionOptionReuse0 != (null)) {
-                        recordsMapArrayUnionOptionReuse0 .clear();
-                        recordsMapArrayUnionOption0 = recordsMapArrayUnionOptionReuse0;
-                    } else {
-                        recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(((int)(((chunkLen14 * 4)+ 2)/ 3)));
-                    }
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), ((int) chunkLen14)));
                     do {
                         for (int counter14 = 0; (counter14 <chunkLen14); counter14 ++) {
                             Utf8 key5 = (decoder.readString(null));
@@ -872,7 +814,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                                         recordsMapArrayUnionOptionValue0 .add(null);
                                     } else {
                                         if (unionIndex23 == 1) {
-                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder)));
+                                            recordsMapArrayUnionOptionValue0 .add(deserializeSubRecord0(recordsMapArrayUnionOptionValueArrayElementReuseVar0, (decoder), (customization)));
                                         } else {
                                             throw new RuntimeException(("Illegal union index for 'recordsMapArrayUnionOptionValueElem': "+ unionIndex23));
                                         }
@@ -885,7 +827,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
                         chunkLen14 = (decoder.mapNext());
                     } while (chunkLen14 > 0);
                 } else {
-                    recordsMapArrayUnionOption0 = new HashMap<Utf8, List<com.linkedin.avro.fastserde.generated.avro.SubRecord>>(0);
+                    recordsMapArrayUnionOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(TestRecord.get(31), 0));
                 }
                 TestRecord.put(31, recordsMapArrayUnionOption0);
             } else {
@@ -898,7 +840,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
             TestRecord.put(32, null);
         } else {
             if (unionIndex24 == 1) {
-                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder)));
+                TestRecord.put(32, deserializeSubRecord0(TestRecord.get(32), (decoder), (customization)));
             } else {
                 if (unionIndex24 == 2) {
                     Utf8 charSequence4;
@@ -920,7 +862,7 @@ private void populate_TestRecord15(com.linkedin.avro.fastserde.generated.avro.Te
         }
     }
 
-    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveBooleanList booleanArray0 = null;
@@ -957,7 +899,7 @@ private void populate_TestRecord16(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(34, doubleArray0);
     }
 
-    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveFloatList floatArray0 = null;
@@ -981,7 +923,7 @@ private void populate_TestRecord17(com.linkedin.avro.fastserde.generated.avro.Te
         TestRecord.put(36, intArray0);
     }
 
-    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, Decoder decoder)
+    private void populate_TestRecord18(com.linkedin.avro.fastserde.generated.avro.TestRecord TestRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         PrimitiveLongList longArray0 = null;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_1971822364_1672473580.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_1971822364_1672473580.java
index 015ae6741..246a6b02e 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_1971822364_1672473580.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_1971822364_1672473580.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -19,13 +20,13 @@ public UNION_GenericDeserializer_1971822364_1672473580(Schema readerSchema) {
         this.recordRecordSchema0 = readerSchema.getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_2018567528_1606337179.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_2018567528_1606337179.java
index 2aa1beb3d..f68833b81 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_2018567528_1606337179.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_2018567528_1606337179.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericArray;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,7 +24,7 @@ public UNION_GenericDeserializer_2018567528_1606337179(Schema readerSchema) {
         this.arrayArrayElemSchema0 = arrayArraySchema0 .getElementType();
     }
 
-    public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decoder)
+    public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         List<IndexedRecord> array0 = null;
@@ -44,14 +45,14 @@ public List<IndexedRecord> deserialize(List<IndexedRecord> reuse, Decoder decode
                 if ((reuse) instanceof GenericArray) {
                     arrayArrayElementReuseVar0 = ((GenericArray)(reuse)).peek();
                 }
-                array0 .add(deserializerecord0(arrayArrayElementReuseVar0, (decoder)));
+                array0 .add(deserializerecord0(arrayArrayElementReuseVar0, (decoder), (customization)));
             }
             chunkLen0 = (decoder.arrayNext());
         }
         return array0;
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_568621313_1223705675.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_568621313_1223705675.java
index 368ca98dc..4e0c468bb 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_568621313_1223705675.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UNION_GenericDeserializer_568621313_1223705675.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,36 +24,27 @@ public UNION_GenericDeserializer_568621313_1223705675(Schema readerSchema) {
         this.mapMapValueSchema0 = mapMapSchema0 .getValueType();
     }
 
-    public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Decoder decoder)
+    public Map<Utf8, IndexedRecord> deserialize(Map<Utf8, IndexedRecord> reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         Map<Utf8, IndexedRecord> map0 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, IndexedRecord> mapReuse0 = null;
-            if ((reuse) instanceof Map) {
-                mapReuse0 = ((Map)(reuse));
-            }
-            if (mapReuse0 != (null)) {
-                mapReuse0 .clear();
-                map0 = mapReuse0;
-            } else {
-                map0 = new HashMap<Utf8, IndexedRecord>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
-                    map0 .put(key0, deserializerecord0(null, (decoder)));
+                    map0 .put(key0, deserializerecord0(null, (decoder), (customization)));
                 }
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            map0 = new HashMap<Utf8, IndexedRecord>(0);
+            map0 = ((Map)(customization).getNewMapOverrideFunc().apply((reuse), 0));
         }
         return map0;
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UnionOfRecordsWithSameNameEnumField_SpecificDeserializer_1341667615_1341667615.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UnionOfRecordsWithSameNameEnumField_SpecificDeserializer_1341667615_1341667615.java
index 41683188a..fed7de961 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UnionOfRecordsWithSameNameEnumField_SpecificDeserializer_1341667615_1341667615.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/UnionOfRecordsWithSameNameEnumField_SpecificDeserializer_1341667615_1341667615.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.generated.avro.MyEnumV1;
 import com.linkedin.avro.fastserde.generated.avro.MyEnumV2;
 import com.linkedin.avroutil1.Enums;
@@ -19,13 +20,13 @@ public UnionOfRecordsWithSameNameEnumField_SpecificDeserializer_1341667615_13416
         this.readerSchema = readerSchema;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnumField deserialize(com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnumField reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnumField deserialize(com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnumField reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializeUnionOfRecordsWithSameNameEnumField0((reuse), (decoder));
+        return deserializeUnionOfRecordsWithSameNameEnumField0((reuse), (decoder), (customization));
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnumField deserializeUnionOfRecordsWithSameNameEnumField0(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnumField deserializeUnionOfRecordsWithSameNameEnumField0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnumField UnionOfRecordsWithSameNameEnumField;
@@ -36,10 +37,10 @@ public com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnum
         }
         int unionIndex0 = (decoder.readIndex());
         if (unionIndex0 == 0) {
-            UnionOfRecordsWithSameNameEnumField.put(0, deserializeMyRecordV10(UnionOfRecordsWithSameNameEnumField.get(0), (decoder)));
+            UnionOfRecordsWithSameNameEnumField.put(0, deserializeMyRecordV10(UnionOfRecordsWithSameNameEnumField.get(0), (decoder), (customization)));
         } else {
             if (unionIndex0 == 1) {
-                UnionOfRecordsWithSameNameEnumField.put(0, deserializeMyRecordV20(UnionOfRecordsWithSameNameEnumField.get(0), (decoder)));
+                UnionOfRecordsWithSameNameEnumField.put(0, deserializeMyRecordV20(UnionOfRecordsWithSameNameEnumField.get(0), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'unionField': "+ unionIndex0));
             }
@@ -47,7 +48,7 @@ public com.linkedin.avro.fastserde.generated.avro.UnionOfRecordsWithSameNameEnum
         return UnionOfRecordsWithSameNameEnumField;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.MyRecordV1 deserializeMyRecordV10(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.MyRecordV1 deserializeMyRecordV10(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.MyRecordV1 MyRecordV1;
@@ -60,7 +61,7 @@ public com.linkedin.avro.fastserde.generated.avro.MyRecordV1 deserializeMyRecord
         return MyRecordV1;
     }
 
-    public com.linkedin.avro.fastserde.generated.avro.MyRecordV2 deserializeMyRecordV20(Object reuse, Decoder decoder)
+    public com.linkedin.avro.fastserde.generated.avro.MyRecordV2 deserializeMyRecordV20(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         com.linkedin.avro.fastserde.generated.avro.MyRecordV2 MyRecordV2;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/recordName_GenericDeserializer_1743054079_1743054079.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/recordName_GenericDeserializer_1743054079_1743054079.java
index cc8f3086e..76cb1abf8 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/recordName_GenericDeserializer_1743054079_1743054079.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/recordName_GenericDeserializer_1743054079_1743054079.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -20,13 +21,13 @@ public recordName_GenericDeserializer_1743054079_1743054079(Schema readerSchema)
         this.unionField0 = readerSchema.getField("unionField").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecordName0((reuse), (decoder));
+        return deserializerecordName0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecordName0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecordName0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord recordName;
@@ -43,11 +44,11 @@ public IndexedRecord deserializerecordName0(Object reuse, Decoder decoder)
             charSequence0 = (decoder).readString(null);
         }
         recordName.put(0, charSequence0);
-        populate_recordName0((recordName), (decoder));
+        populate_recordName0((recordName), (customization), (decoder));
         return recordName;
     }
 
-    private void populate_recordName0(IndexedRecord recordName, Decoder decoder)
+    private void populate_recordName0(IndexedRecord recordName, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -56,7 +57,7 @@ private void populate_recordName0(IndexedRecord recordName, Decoder decoder)
             recordName.put(1, null);
         } else {
             if (unionIndex0 == 1) {
-                recordName.put(1, deserializerecordName0(recordName.get(1), (decoder)));
+                recordName.put(1, deserializerecordName0(recordName.get(1), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'unionField': "+ unionIndex0));
             }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1025741720_1557256887.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1025741720_1557256887.java
index 6224c4290..4b52ce615 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1025741720_1557256887.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1025741720_1557256887.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,13 +23,13 @@ public record_GenericDeserializer_1025741720_1557256887(Schema readerSchema) {
         this.someInts0 = readerSchema.getField("someInts").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
@@ -46,17 +46,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
                 Map<Utf8, Integer> someIntsOption0 = null;
                 long chunkLen0 = (decoder.readMapStart());
                 if (chunkLen0 > 0) {
-                    Map<Utf8, Integer> someIntsOptionReuse0 = null;
-                    Object oldMap0 = record.get(0);
-                    if (oldMap0 instanceof Map) {
-                        someIntsOptionReuse0 = ((Map) oldMap0);
-                    }
-                    if (someIntsOptionReuse0 != (null)) {
-                        someIntsOptionReuse0 .clear();
-                        someIntsOption0 = someIntsOptionReuse0;
-                    } else {
-                        someIntsOption0 = new HashMap<Utf8, Integer>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-                    }
+                    someIntsOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(record.get(0), ((int) chunkLen0)));
                     do {
                         for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                             Utf8 key0 = (decoder.readString(null));
@@ -74,7 +64,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
                         chunkLen0 = (decoder.mapNext());
                     } while (chunkLen0 > 0);
                 } else {
-                    someIntsOption0 = new HashMap<Utf8, Integer>(0);
+                    someIntsOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(record.get(0), 0));
                 }
                 record.put(0, someIntsOption0);
             } else {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1126840752_2099305627.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1126840752_2099305627.java
index 4c47a76a1..c3a20b1e5 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1126840752_2099305627.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1126840752_2099305627.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -18,13 +19,13 @@ public record_GenericDeserializer_1126840752_2099305627(Schema readerSchema) {
         this.readerSchema = readerSchema;
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1191367445_653449771.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1191367445_653449771.java
index ae69adb4a..7dfd1917f 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1191367445_653449771.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1191367445_653449771.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
@@ -22,13 +23,13 @@ public record_GenericDeserializer_1191367445_653449771(Schema readerSchema) {
         this.someInts0 = readerSchema.getField("someInts").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1373882843_1971822364.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1373882843_1971822364.java
index a93e5083c..ae3d2efb1 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1373882843_1971822364.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1373882843_1971822364.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -17,13 +18,13 @@ public record_GenericDeserializer_1373882843_1971822364(Schema readerSchema) {
         this.readerSchema = readerSchema;
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1556659421_711533897.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1556659421_711533897.java
index 3c6a0ba16..18a87d766 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1556659421_711533897.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1556659421_711533897.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -20,13 +21,13 @@ public record_GenericDeserializer_1556659421_711533897(Schema readerSchema) {
         this.subRecord0 = readerSchema.getField("subRecord").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
@@ -40,7 +41,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
             throw new AvroTypeException("Found \"null\", expecting {\"type\":\"record\",\"name\":\"subRecord\",\"namespace\":\"com.linkedin.avro.fastserde.generated.avro\",\"doc\":\"subRecord\",\"fields\":[{\"name\":\"someInt1\",\"type\":\"int\",\"doc\":\"\"},{\"name\":\"someInt2\",\"type\":\"int\",\"doc\":\"\"}]}");
         } else {
             if (unionIndex0 == 1) {
-                record.put(0, deserializesubRecord0(record.get(0), (decoder)));
+                record.put(0, deserializesubRecord0(record.get(0), (decoder), (customization)));
             } else {
                 throw new RuntimeException(("Illegal union index for 'subRecord': "+ unionIndex0));
             }
@@ -48,7 +49,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
         return record;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -58,11 +59,11 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
             subRecord = new org.apache.avro.generic.GenericData.Record(subRecord0);
         }
         subRecord.put(0, (decoder.readInt()));
-        populate_subRecord0((subRecord), (decoder));
+        populate_subRecord0((subRecord), (customization), (decoder));
         return subRecord;
     }
 
-    private void populate_subRecord0(IndexedRecord subRecord, Decoder decoder)
+    private void populate_subRecord0(IndexedRecord subRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         subRecord.put(1, (decoder.readInt()));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1557256887_1025741720.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1557256887_1025741720.java
index bf4f60a0c..5dd87ae65 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1557256887_1025741720.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1557256887_1025741720.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -26,13 +26,13 @@ public record_GenericDeserializer_1557256887_1025741720(Schema readerSchema) {
         this.someIntsMapValueSchema0 = someIntsMapSchema0 .getValueType();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
@@ -44,17 +44,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
         Map<Utf8, Integer> someInts1 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, Integer> someIntsReuse0 = null;
-            Object oldMap0 = record.get(0);
-            if (oldMap0 instanceof Map) {
-                someIntsReuse0 = ((Map) oldMap0);
-            }
-            if (someIntsReuse0 != (null)) {
-                someIntsReuse0 .clear();
-                someInts1 = someIntsReuse0;
-            } else {
-                someInts1 = new HashMap<Utf8, Integer>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            someInts1 = ((Map)(customization).getNewMapOverrideFunc().apply(record.get(0), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
@@ -63,7 +53,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            someInts1 = new HashMap<Utf8, Integer>(0);
+            someInts1 = ((Map)(customization).getNewMapOverrideFunc().apply(record.get(0), 0));
         }
         record.put(0, someInts1);
         return record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1557256887_753570467.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1557256887_753570467.java
index f74b88097..4804b28f6 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1557256887_753570467.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1557256887_753570467.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,13 +24,13 @@ public record_GenericDeserializer_1557256887_753570467(Schema readerSchema) {
         this.someIntsMapSchema0 = someInts0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
@@ -42,17 +42,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
         Map<Utf8, Integer> someInts1 = null;
         long chunkLen0 = (decoder.readMapStart());
         if (chunkLen0 > 0) {
-            Map<Utf8, Integer> someIntsReuse0 = null;
-            Object oldMap0 = record.get(0);
-            if (oldMap0 instanceof Map) {
-                someIntsReuse0 = ((Map) oldMap0);
-            }
-            if (someIntsReuse0 != (null)) {
-                someIntsReuse0 .clear();
-                someInts1 = someIntsReuse0;
-            } else {
-                someInts1 = new HashMap<Utf8, Integer>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-            }
+            someInts1 = ((Map)(customization).getNewMapOverrideFunc().apply(record.get(0), ((int) chunkLen0)));
             do {
                 for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                     Utf8 key0 = (decoder.readString(null));
@@ -61,7 +51,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
                 chunkLen0 = (decoder.mapNext());
             } while (chunkLen0 > 0);
         } else {
-            someInts1 = new HashMap<Utf8, Integer>(0);
+            someInts1 = ((Map)(customization).getNewMapOverrideFunc().apply(record.get(0), 0));
         }
         record.put(0, someInts1);
         return record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1672473580_1971822364.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1672473580_1971822364.java
index 34b30b0b5..678b885e5 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1672473580_1971822364.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1672473580_1971822364.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -18,7 +19,7 @@ public record_GenericDeserializer_1672473580_1971822364(Schema readerSchema) {
         this.readerSchema = readerSchema;
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         int unionIndex0 = (decoder.readIndex());
@@ -26,14 +27,14 @@ public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
             throw new AvroTypeException("Found \"null\", expecting {\"type\":\"record\",\"name\":\"record\",\"namespace\":\"com.linkedin.avro.fastserde.generated.avro\",\"doc\":\"record\",\"fields\":[{\"name\":\"someInt\",\"type\":\"int\",\"doc\":\"\"}]}");
         } else {
             if (unionIndex0 == 1) {
-                return deserializerecord0((reuse), (decoder));
+                return deserializerecord0((reuse), (decoder), (customization));
             } else {
                 throw new RuntimeException(("Illegal union index for 'union': "+ unionIndex0));
             }
         }
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1971822364_1373882843.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1971822364_1373882843.java
index 65297d224..4a3bb17f6 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1971822364_1373882843.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_1971822364_1373882843.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -19,13 +20,13 @@ public record_GenericDeserializer_1971822364_1373882843(Schema readerSchema) {
         this.someInt0 = readerSchema.getField("someInt").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_653449771_1191367445.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_653449771_1191367445.java
index 5d235c52a..d0accdfb6 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_653449771_1191367445.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_653449771_1191367445.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,13 +24,13 @@ public record_GenericDeserializer_653449771_1191367445(Schema readerSchema) {
         this.someIntsArraySchema0 = someInts0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_653449771_813379571.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_653449771_813379571.java
index 7f229c2e6..ca3fc54e4 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_653449771_813379571.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_653449771_813379571.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -24,13 +25,13 @@ public record_GenericDeserializer_653449771_813379571(Schema readerSchema) {
         this.someIntsArrayElemSchema0 = someIntsArraySchema0 .getElementType();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_711533897_1556659421.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_711533897_1556659421.java
index 57c1517b4..0f8498547 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_711533897_1556659421.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_711533897_1556659421.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Decoder;
@@ -21,13 +22,13 @@ public record_GenericDeserializer_711533897_1556659421(Schema readerSchema) {
         this.subRecordRecordSchema0 = subRecord0 .getTypes().get(1);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
@@ -36,11 +37,11 @@ record = ((IndexedRecord)(reuse));
         } else {
             record = new org.apache.avro.generic.GenericData.Record(readerSchema);
         }
-        record.put(0, deserializesubRecord0(record.get(0), (decoder)));
+        record.put(0, deserializesubRecord0(record.get(0), (decoder), (customization)));
         return record;
     }
 
-    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord subRecord;
@@ -50,11 +51,11 @@ public IndexedRecord deserializesubRecord0(Object reuse, Decoder decoder)
             subRecord = new org.apache.avro.generic.GenericData.Record(subRecordRecordSchema0);
         }
         subRecord.put(0, (decoder.readInt()));
-        populate_subRecord0((subRecord), (decoder));
+        populate_subRecord0((subRecord), (customization), (decoder));
         return subRecord;
     }
 
-    private void populate_subRecord0(IndexedRecord subRecord, Decoder decoder)
+    private void populate_subRecord0(IndexedRecord subRecord, DatumReaderCustomization customization, Decoder decoder)
         throws IOException
     {
         subRecord.put(1, (decoder.readInt()));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_753570467_1557256887.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_753570467_1557256887.java
index 693567e25..2e18419cf 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_753570467_1557256887.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_753570467_1557256887.java
@@ -2,9 +2,9 @@
 package com.linkedin.avro.fastserde.generated.deserialization.AVRO_1_11;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -23,13 +23,13 @@ public record_GenericDeserializer_753570467_1557256887(Schema readerSchema) {
         this.someInts0 = readerSchema.getField("someInts").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
@@ -46,17 +46,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
                 Map<Utf8, Integer> someIntsOption0 = null;
                 long chunkLen0 = (decoder.readMapStart());
                 if (chunkLen0 > 0) {
-                    Map<Utf8, Integer> someIntsOptionReuse0 = null;
-                    Object oldMap0 = record.get(0);
-                    if (oldMap0 instanceof Map) {
-                        someIntsOptionReuse0 = ((Map) oldMap0);
-                    }
-                    if (someIntsOptionReuse0 != (null)) {
-                        someIntsOptionReuse0 .clear();
-                        someIntsOption0 = someIntsOptionReuse0;
-                    } else {
-                        someIntsOption0 = new HashMap<Utf8, Integer>(((int)(((chunkLen0 * 4)+ 2)/ 3)));
-                    }
+                    someIntsOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(record.get(0), ((int) chunkLen0)));
                     do {
                         for (int counter0 = 0; (counter0 <chunkLen0); counter0 ++) {
                             Utf8 key0 = (decoder.readString(null));
@@ -65,7 +55,7 @@ record = new org.apache.avro.generic.GenericData.Record(readerSchema);
                         chunkLen0 = (decoder.mapNext());
                     } while (chunkLen0 > 0);
                 } else {
-                    someIntsOption0 = new HashMap<Utf8, Integer>(0);
+                    someIntsOption0 = ((Map)(customization).getNewMapOverrideFunc().apply(record.get(0), 0));
                 }
                 record.put(0, someIntsOption0);
             } else {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_813379571_653449771.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_813379571_653449771.java
index ea4ff8093..3a86f36a4 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_813379571_653449771.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/record_GenericDeserializer_813379571_653449771.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avro.fastserde.primitive.PrimitiveIntArrayList;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
@@ -23,13 +24,13 @@ public record_GenericDeserializer_813379571_653449771(Schema readerSchema) {
         this.someInts0 = readerSchema.getField("someInts").schema();
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializerecord0((reuse), (decoder));
+        return deserializerecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializerecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord record;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/testRecord_GenericDeserializer_1146484089_1256982207.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/testRecord_GenericDeserializer_1146484089_1256982207.java
index 5f36ad64b..f443d4123 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/testRecord_GenericDeserializer_1146484089_1256982207.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/deserialization/AVRO_1_11/testRecord_GenericDeserializer_1146484089_1256982207.java
@@ -6,6 +6,7 @@
 import java.util.HashMap;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastDeserializer;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import org.apache.avro.AvroTypeException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericEnumSymbol;
@@ -30,13 +31,13 @@ public testRecord_GenericDeserializer_1146484089_1256982207(Schema readerSchema)
         this.enumMappingtestEnum0 = Collections.unmodifiableMap(tempEnumMapping0);
     }
 
-    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder)
+    public IndexedRecord deserialize(IndexedRecord reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
-        return deserializetestRecord0((reuse), (decoder));
+        return deserializetestRecord0((reuse), (decoder), (customization));
     }
 
-    public IndexedRecord deserializetestRecord0(Object reuse, Decoder decoder)
+    public IndexedRecord deserializetestRecord0(Object reuse, Decoder decoder, DatumReaderCustomization customization)
         throws IOException
     {
         IndexedRecord testRecord;
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_BOOLEAN_GenericSerializer_869749973.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_BOOLEAN_GenericSerializer_869749973.java
index e4dd3fc12..8dd1a414c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_BOOLEAN_GenericSerializer_869749973.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_BOOLEAN_GenericSerializer_869749973.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import com.linkedin.avro.api.PrimitiveBooleanList;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.io.Encoder;
 
 public class Array_of_BOOLEAN_GenericSerializer_869749973
@@ -12,7 +13,7 @@ public class Array_of_BOOLEAN_GenericSerializer_869749973
 {
 
 
-    public void serialize(List<Boolean> data, Encoder encoder)
+    public void serialize(List<Boolean> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeArrayStart();
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_DOUBLE_GenericSerializer_18760307.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_DOUBLE_GenericSerializer_18760307.java
index 48816d57e..5c66b3861 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_DOUBLE_GenericSerializer_18760307.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_DOUBLE_GenericSerializer_18760307.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import com.linkedin.avro.api.PrimitiveDoubleList;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.io.Encoder;
 
 public class Array_of_DOUBLE_GenericSerializer_18760307
@@ -12,7 +13,7 @@ public class Array_of_DOUBLE_GenericSerializer_18760307
 {
 
 
-    public void serialize(List<Double> data, Encoder encoder)
+    public void serialize(List<Double> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeArrayStart();
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_FLOAT_GenericSerializer_1012670397.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_FLOAT_GenericSerializer_1012670397.java
index 52bb9253b..769e38239 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_FLOAT_GenericSerializer_1012670397.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_FLOAT_GenericSerializer_1012670397.java
@@ -6,6 +6,7 @@
 import com.linkedin.avro.api.PrimitiveFloatList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.io.Encoder;
 
 public class Array_of_FLOAT_GenericSerializer_1012670397
@@ -13,7 +14,7 @@ public class Array_of_FLOAT_GenericSerializer_1012670397
 {
 
 
-    public void serialize(List<Float> data, Encoder encoder)
+    public void serialize(List<Float> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeArrayStart();
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_INT_GenericSerializer_1012089072.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_INT_GenericSerializer_1012089072.java
index 8185166fd..4cf5d2fc1 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_INT_GenericSerializer_1012089072.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_INT_GenericSerializer_1012089072.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.io.Encoder;
 
 public class Array_of_INT_GenericSerializer_1012089072
@@ -12,7 +13,7 @@ public class Array_of_INT_GenericSerializer_1012089072
 {
 
 
-    public void serialize(List<Integer> data, Encoder encoder)
+    public void serialize(List<Integer> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeArrayStart();
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_LONG_GenericSerializer_325099267.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_LONG_GenericSerializer_325099267.java
index efccd52e4..6ffbdfcc9 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_LONG_GenericSerializer_325099267.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_LONG_GenericSerializer_325099267.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import com.linkedin.avro.api.PrimitiveLongList;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.io.Encoder;
 
 public class Array_of_LONG_GenericSerializer_325099267
@@ -12,7 +13,7 @@ public class Array_of_LONG_GenericSerializer_325099267
 {
 
 
-    public void serialize(List<Long> data, Encoder encoder)
+    public void serialize(List<Long> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeArrayStart();
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_UNION_GenericSerializer_777827233.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_UNION_GenericSerializer_777827233.java
index b34eb1e05..d3e04ee69 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_UNION_GenericSerializer_777827233.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_UNION_GenericSerializer_777827233.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -13,7 +14,7 @@ public class Array_of_UNION_GenericSerializer_777827233
 {
 
 
-    public void serialize(List<IndexedRecord> data, Encoder encoder)
+    public void serialize(List<IndexedRecord> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeArrayStart();
@@ -31,7 +32,7 @@ public void serialize(List<IndexedRecord> data, Encoder encoder)
                 } else {
                     if ((union0 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.record".equals(((IndexedRecord) union0).getSchema().getFullName())) {
                         (encoder).writeIndex(1);
-                        serializeRecord0(((IndexedRecord) union0), (encoder));
+                        serializeRecord0(((IndexedRecord) union0), (encoder), (customization));
                     }
                 }
             }
@@ -40,7 +41,7 @@ public void serialize(List<IndexedRecord> data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence field0 = ((CharSequence) data.get(0));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_record_GenericSerializer_477614132.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_record_GenericSerializer_477614132.java
index 8aa0633f7..5cdbd0ee5 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_record_GenericSerializer_477614132.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Array_of_record_GenericSerializer_477614132.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -13,7 +14,7 @@ public class Array_of_record_GenericSerializer_477614132
 {
 
 
-    public void serialize(List<IndexedRecord> data, Encoder encoder)
+    public void serialize(List<IndexedRecord> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeArrayStart();
@@ -25,14 +26,14 @@ public void serialize(List<IndexedRecord> data, Encoder encoder)
                 (encoder).startItem();
                 IndexedRecord record0 = null;
                 record0 = ((List<IndexedRecord> ) data).get(counter0);
-                serializeRecord0(record0, (encoder));
+                serializeRecord0(record0, (encoder), (customization));
             }
         }
         (encoder).writeArrayEnd();
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence field0 = ((CharSequence) data.get(0));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord_GenericSerializer_312360713.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord_GenericSerializer_312360713.java
index 015350bae..2cc0b53e3 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord_GenericSerializer_312360713.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord_GenericSerializer_312360713.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 
@@ -11,521 +12,521 @@ public class FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord_Gener
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldSerializeLargeRecord0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldSerializeLargeRecord0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldSerializeLargeRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldSerializeLargeRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(0)));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord0(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord1(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord2(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord3(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord4(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord5(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord6(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord7(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord8(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord9(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord10(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord11(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord12(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord13(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord14(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord15(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord16(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord17(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord18(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord19(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord20(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord21(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord22(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord23(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord24(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord25(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord26(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord27(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord28(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord29(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord30(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord31(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord32(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord33(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord34(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord35(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord36(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord37(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord38(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord39(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord40(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord41(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord42(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord43(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord44(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord45(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord46(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord47(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord48(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord49(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord50(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord51(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord52(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord53(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord54(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord55(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord56(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord57(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord58(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord59(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord60(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord61(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord62(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord63(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord64(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord65(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord66(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord67(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord68(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord69(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord70(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord71(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord72(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord73(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord74(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord75(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord76(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord77(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord78(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord79(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord80(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord81(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord82(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord83(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord84(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord85(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord86(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord87(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord88(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord89(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord90(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord91(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord92(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord93(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord94(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord95(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord96(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord97(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord98(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord99(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord100(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord101(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord102(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord103(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord104(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord105(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord106(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord107(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord108(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord109(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord110(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord111(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord112(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord113(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord114(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord115(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord116(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord117(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord118(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord119(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord120(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord121(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord122(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord123(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord124(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord125(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord126(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord127(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord128(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord129(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord130(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord131(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord132(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord133(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord134(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord135(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord136(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord137(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord138(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord139(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord140(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord141(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord142(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord143(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord144(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord145(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord146(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord147(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord148(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord149(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord150(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord151(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord152(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord153(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord154(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord155(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord156(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord157(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord158(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord159(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord160(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord161(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord162(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord163(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord164(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord165(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord166(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord167(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord168(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord169(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord170(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord171(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord172(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord173(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord174(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord175(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord176(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord177(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord178(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord179(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord180(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord181(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord182(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord183(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord184(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord185(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord186(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord187(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord188(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord189(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord190(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord191(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord192(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord193(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord194(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord195(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord196(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord197(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord198(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord199(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord200(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord201(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord202(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord203(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord204(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord205(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord206(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord207(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord208(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord209(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord210(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord211(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord212(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord213(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord214(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord215(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord216(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord217(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord218(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord219(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord220(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord221(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord222(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord223(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord224(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord225(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord226(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord227(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord228(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord229(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord230(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord231(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord232(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord233(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord234(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord235(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord236(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord237(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord238(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord239(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord240(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord241(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord242(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord243(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord244(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord245(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord246(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord247(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord248(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord249(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord250(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord251(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord252(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord253(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord254(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord255(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord256(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord257(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord258(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord259(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord260(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord261(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord262(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord263(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord264(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord265(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord266(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord267(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord268(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord269(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord270(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord271(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord272(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord273(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord274(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord275(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord276(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord277(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord278(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord279(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord280(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord281(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord282(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord283(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord284(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord285(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord286(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord287(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord288(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord289(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord290(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord291(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord292(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord293(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord294(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord295(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord296(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord297(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord298(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord299(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord300(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord301(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord302(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord303(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord304(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord305(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord306(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord307(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord308(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord309(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord310(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord311(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord312(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord313(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord314(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord315(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord316(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord317(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord318(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord319(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord320(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord321(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord322(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord323(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord324(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord325(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord326(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord327(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord328(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord329(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord330(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord331(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord332(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord333(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord334(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord335(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord336(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord337(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord338(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord339(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord340(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord341(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord342(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord343(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord344(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord345(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord346(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord347(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord348(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord349(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord350(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord351(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord352(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord353(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord354(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord355(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord356(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord357(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord358(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord359(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord360(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord361(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord362(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord363(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord364(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord365(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord366(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord367(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord368(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord369(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord370(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord371(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord372(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord373(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord374(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord375(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord376(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord377(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord378(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord379(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord380(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord381(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord382(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord383(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord384(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord385(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord386(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord387(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord388(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord389(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord390(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord391(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord392(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord393(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord394(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord395(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord396(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord397(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord398(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord399(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord400(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord401(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord402(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord403(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord404(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord405(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord406(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord407(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord408(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord409(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord410(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord411(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord412(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord413(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord414(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord415(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord416(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord417(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord418(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord419(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord420(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord421(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord422(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord423(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord424(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord425(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord426(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord427(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord428(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord429(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord430(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord431(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord432(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord433(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord434(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord435(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord436(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord437(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord438(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord439(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord440(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord441(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord442(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord443(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord444(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord445(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord446(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord447(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord448(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord449(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord450(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord451(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord452(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord453(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord454(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord455(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord456(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord457(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord458(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord459(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord460(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord461(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord462(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord463(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord464(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord465(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord466(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord467(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord468(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord469(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord470(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord471(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord472(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord473(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord474(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord475(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord476(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord477(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord478(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord479(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord480(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord481(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord482(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord483(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord484(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord485(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord486(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord487(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord488(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord489(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord490(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord491(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord492(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord493(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord494(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord495(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord496(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord497(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord498(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord499(data, (encoder));
-    }
-
-    @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord0(IndexedRecord data, Encoder encoder)
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord0(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord1(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord2(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord3(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord4(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord5(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord6(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord7(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord8(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord9(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord10(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord11(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord12(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord13(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord14(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord15(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord16(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord17(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord18(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord19(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord20(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord21(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord22(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord23(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord24(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord25(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord26(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord27(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord28(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord29(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord30(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord31(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord32(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord33(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord34(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord35(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord36(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord37(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord38(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord39(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord40(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord41(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord42(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord43(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord44(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord45(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord46(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord47(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord48(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord49(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord50(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord51(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord52(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord53(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord54(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord55(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord56(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord57(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord58(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord59(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord60(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord61(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord62(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord63(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord64(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord65(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord66(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord67(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord68(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord69(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord70(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord71(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord72(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord73(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord74(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord75(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord76(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord77(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord78(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord79(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord80(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord81(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord82(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord83(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord84(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord85(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord86(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord87(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord88(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord89(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord90(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord91(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord92(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord93(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord94(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord95(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord96(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord97(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord98(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord99(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord100(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord101(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord102(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord103(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord104(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord105(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord106(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord107(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord108(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord109(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord110(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord111(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord112(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord113(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord114(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord115(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord116(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord117(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord118(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord119(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord120(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord121(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord122(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord123(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord124(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord125(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord126(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord127(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord128(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord129(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord130(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord131(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord132(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord133(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord134(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord135(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord136(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord137(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord138(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord139(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord140(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord141(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord142(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord143(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord144(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord145(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord146(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord147(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord148(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord149(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord150(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord151(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord152(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord153(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord154(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord155(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord156(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord157(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord158(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord159(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord160(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord161(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord162(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord163(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord164(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord165(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord166(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord167(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord168(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord169(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord170(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord171(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord172(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord173(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord174(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord175(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord176(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord177(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord178(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord179(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord180(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord181(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord182(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord183(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord184(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord185(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord186(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord187(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord188(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord189(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord190(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord191(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord192(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord193(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord194(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord195(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord196(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord197(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord198(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord199(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord200(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord201(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord202(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord203(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord204(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord205(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord206(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord207(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord208(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord209(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord210(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord211(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord212(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord213(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord214(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord215(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord216(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord217(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord218(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord219(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord220(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord221(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord222(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord223(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord224(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord225(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord226(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord227(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord228(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord229(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord230(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord231(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord232(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord233(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord234(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord235(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord236(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord237(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord238(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord239(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord240(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord241(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord242(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord243(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord244(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord245(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord246(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord247(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord248(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord249(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord250(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord251(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord252(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord253(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord254(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord255(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord256(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord257(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord258(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord259(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord260(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord261(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord262(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord263(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord264(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord265(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord266(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord267(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord268(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord269(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord270(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord271(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord272(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord273(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord274(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord275(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord276(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord277(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord278(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord279(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord280(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord281(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord282(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord283(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord284(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord285(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord286(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord287(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord288(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord289(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord290(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord291(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord292(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord293(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord294(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord295(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord296(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord297(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord298(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord299(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord300(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord301(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord302(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord303(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord304(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord305(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord306(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord307(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord308(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord309(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord310(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord311(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord312(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord313(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord314(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord315(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord316(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord317(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord318(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord319(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord320(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord321(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord322(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord323(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord324(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord325(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord326(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord327(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord328(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord329(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord330(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord331(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord332(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord333(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord334(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord335(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord336(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord337(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord338(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord339(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord340(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord341(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord342(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord343(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord344(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord345(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord346(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord347(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord348(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord349(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord350(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord351(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord352(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord353(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord354(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord355(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord356(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord357(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord358(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord359(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord360(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord361(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord362(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord363(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord364(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord365(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord366(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord367(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord368(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord369(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord370(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord371(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord372(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord373(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord374(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord375(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord376(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord377(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord378(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord379(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord380(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord381(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord382(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord383(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord384(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord385(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord386(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord387(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord388(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord389(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord390(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord391(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord392(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord393(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord394(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord395(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord396(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord397(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord398(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord399(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord400(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord401(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord402(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord403(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord404(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord405(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord406(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord407(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord408(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord409(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord410(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord411(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord412(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord413(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord414(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord415(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord416(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord417(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord418(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord419(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord420(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord421(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord422(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord423(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord424(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord425(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord426(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord427(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord428(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord429(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord430(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord431(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord432(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord433(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord434(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord435(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord436(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord437(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord438(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord439(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord440(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord441(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord442(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord443(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord444(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord445(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord446(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord447(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord448(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord449(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord450(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord451(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord452(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord453(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord454(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord455(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord456(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord457(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord458(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord459(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord460(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord461(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord462(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord463(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord464(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord465(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord466(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord467(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord468(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord469(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord470(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord471(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord472(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord473(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord474(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord475(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord476(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord477(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord478(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord479(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord480(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord481(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord482(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord483(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord484(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord485(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord486(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord487(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord488(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord489(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord490(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord491(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord492(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord493(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord494(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord495(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord496(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord497(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord498(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord499(data, (encoder), (customization));
+    }
+
+    @SuppressWarnings("unchecked")
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(1)));
@@ -533,7 +534,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord1(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(3)));
@@ -541,7 +542,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord2(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord2(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(5)));
@@ -549,7 +550,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord3(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord3(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(7)));
@@ -557,7 +558,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord4(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord4(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(9)));
@@ -565,7 +566,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord5(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord5(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(11)));
@@ -573,7 +574,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord6(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord6(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(13)));
@@ -581,7 +582,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord7(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord7(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(15)));
@@ -589,7 +590,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord8(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord8(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(17)));
@@ -597,7 +598,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord9(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord9(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(19)));
@@ -605,7 +606,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord10(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord10(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(21)));
@@ -613,7 +614,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord11(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord11(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(23)));
@@ -621,7 +622,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord12(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord12(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(25)));
@@ -629,7 +630,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord13(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord13(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(27)));
@@ -637,7 +638,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord14(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord14(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(29)));
@@ -645,7 +646,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord15(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord15(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(31)));
@@ -653,7 +654,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord16(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord16(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(33)));
@@ -661,7 +662,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord17(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord17(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(35)));
@@ -669,7 +670,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord18(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord18(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(37)));
@@ -677,7 +678,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord19(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord19(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(39)));
@@ -685,7 +686,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord20(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord20(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(41)));
@@ -693,7 +694,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord21(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord21(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(43)));
@@ -701,7 +702,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord22(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord22(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(45)));
@@ -709,7 +710,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord23(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord23(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(47)));
@@ -717,7 +718,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord24(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord24(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(49)));
@@ -725,7 +726,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord25(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord25(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(51)));
@@ -733,7 +734,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord26(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord26(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(53)));
@@ -741,7 +742,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord27(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord27(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(55)));
@@ -749,7 +750,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord28(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord28(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(57)));
@@ -757,7 +758,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord29(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord29(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(59)));
@@ -765,7 +766,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord30(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord30(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(61)));
@@ -773,7 +774,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord31(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord31(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(63)));
@@ -781,7 +782,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord32(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord32(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(65)));
@@ -789,7 +790,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord33(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord33(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(67)));
@@ -797,7 +798,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord34(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord34(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(69)));
@@ -805,7 +806,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord35(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord35(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(71)));
@@ -813,7 +814,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord36(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord36(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(73)));
@@ -821,7 +822,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord37(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord37(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(75)));
@@ -829,7 +830,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord38(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord38(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(77)));
@@ -837,7 +838,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord39(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord39(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(79)));
@@ -845,7 +846,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord40(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord40(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(81)));
@@ -853,7 +854,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord41(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord41(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(83)));
@@ -861,7 +862,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord42(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord42(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(85)));
@@ -869,7 +870,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord43(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord43(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(87)));
@@ -877,7 +878,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord44(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord44(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(89)));
@@ -885,7 +886,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord45(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord45(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(91)));
@@ -893,7 +894,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord46(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord46(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(93)));
@@ -901,7 +902,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord47(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord47(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(95)));
@@ -909,7 +910,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord48(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord48(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(97)));
@@ -917,7 +918,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord49(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord49(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(99)));
@@ -925,7 +926,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord50(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord50(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(101)));
@@ -933,7 +934,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord51(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord51(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(103)));
@@ -941,7 +942,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord52(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord52(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(105)));
@@ -949,7 +950,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord53(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord53(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(107)));
@@ -957,7 +958,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord54(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord54(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(109)));
@@ -965,7 +966,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord55(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord55(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(111)));
@@ -973,7 +974,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord56(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord56(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(113)));
@@ -981,7 +982,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord57(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord57(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(115)));
@@ -989,7 +990,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord58(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord58(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(117)));
@@ -997,7 +998,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord59(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord59(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(119)));
@@ -1005,7 +1006,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord60(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord60(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(121)));
@@ -1013,7 +1014,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord61(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord61(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(123)));
@@ -1021,7 +1022,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord62(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord62(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(125)));
@@ -1029,7 +1030,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord63(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord63(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(127)));
@@ -1037,7 +1038,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord64(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord64(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(129)));
@@ -1045,7 +1046,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord65(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord65(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(131)));
@@ -1053,7 +1054,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord66(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord66(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(133)));
@@ -1061,7 +1062,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord67(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord67(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(135)));
@@ -1069,7 +1070,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord68(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord68(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(137)));
@@ -1077,7 +1078,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord69(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord69(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(139)));
@@ -1085,7 +1086,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord70(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord70(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(141)));
@@ -1093,7 +1094,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord71(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord71(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(143)));
@@ -1101,7 +1102,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord72(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord72(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(145)));
@@ -1109,7 +1110,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord73(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord73(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(147)));
@@ -1117,7 +1118,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord74(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord74(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(149)));
@@ -1125,7 +1126,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord75(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord75(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(151)));
@@ -1133,7 +1134,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord76(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord76(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(153)));
@@ -1141,7 +1142,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord77(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord77(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(155)));
@@ -1149,7 +1150,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord78(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord78(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(157)));
@@ -1157,7 +1158,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord79(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord79(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(159)));
@@ -1165,7 +1166,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord80(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord80(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(161)));
@@ -1173,7 +1174,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord81(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord81(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(163)));
@@ -1181,7 +1182,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord82(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord82(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(165)));
@@ -1189,7 +1190,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord83(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord83(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(167)));
@@ -1197,7 +1198,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord84(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord84(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(169)));
@@ -1205,7 +1206,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord85(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord85(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(171)));
@@ -1213,7 +1214,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord86(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord86(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(173)));
@@ -1221,7 +1222,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord87(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord87(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(175)));
@@ -1229,7 +1230,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord88(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord88(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(177)));
@@ -1237,7 +1238,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord89(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord89(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(179)));
@@ -1245,7 +1246,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord90(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord90(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(181)));
@@ -1253,7 +1254,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord91(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord91(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(183)));
@@ -1261,7 +1262,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord92(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord92(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(185)));
@@ -1269,7 +1270,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord93(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord93(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(187)));
@@ -1277,7 +1278,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord94(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord94(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(189)));
@@ -1285,7 +1286,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord95(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord95(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(191)));
@@ -1293,7 +1294,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord96(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord96(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(193)));
@@ -1301,7 +1302,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord97(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord97(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(195)));
@@ -1309,7 +1310,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord98(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord98(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(197)));
@@ -1317,7 +1318,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord99(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord99(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(199)));
@@ -1325,7 +1326,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord100(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord100(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(201)));
@@ -1333,7 +1334,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord101(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord101(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(203)));
@@ -1341,7 +1342,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord102(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord102(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(205)));
@@ -1349,7 +1350,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord103(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord103(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(207)));
@@ -1357,7 +1358,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord104(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord104(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(209)));
@@ -1365,7 +1366,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord105(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord105(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(211)));
@@ -1373,7 +1374,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord106(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord106(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(213)));
@@ -1381,7 +1382,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord107(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord107(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(215)));
@@ -1389,7 +1390,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord108(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord108(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(217)));
@@ -1397,7 +1398,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord109(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord109(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(219)));
@@ -1405,7 +1406,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord110(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord110(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(221)));
@@ -1413,7 +1414,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord111(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord111(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(223)));
@@ -1421,7 +1422,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord112(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord112(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(225)));
@@ -1429,7 +1430,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord113(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord113(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(227)));
@@ -1437,7 +1438,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord114(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord114(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(229)));
@@ -1445,7 +1446,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord115(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord115(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(231)));
@@ -1453,7 +1454,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord116(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord116(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(233)));
@@ -1461,7 +1462,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord117(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord117(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(235)));
@@ -1469,7 +1470,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord118(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord118(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(237)));
@@ -1477,7 +1478,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord119(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord119(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(239)));
@@ -1485,7 +1486,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord120(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord120(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(241)));
@@ -1493,7 +1494,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord121(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord121(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(243)));
@@ -1501,7 +1502,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord122(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord122(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(245)));
@@ -1509,7 +1510,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord123(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord123(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(247)));
@@ -1517,7 +1518,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord124(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord124(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(249)));
@@ -1525,7 +1526,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord125(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord125(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(251)));
@@ -1533,7 +1534,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord126(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord126(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(253)));
@@ -1541,7 +1542,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord127(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord127(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(255)));
@@ -1549,7 +1550,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord128(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord128(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(257)));
@@ -1557,7 +1558,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord129(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord129(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(259)));
@@ -1565,7 +1566,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord130(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord130(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(261)));
@@ -1573,7 +1574,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord131(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord131(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(263)));
@@ -1581,7 +1582,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord132(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord132(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(265)));
@@ -1589,7 +1590,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord133(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord133(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(267)));
@@ -1597,7 +1598,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord134(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord134(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(269)));
@@ -1605,7 +1606,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord135(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord135(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(271)));
@@ -1613,7 +1614,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord136(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord136(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(273)));
@@ -1621,7 +1622,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord137(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord137(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(275)));
@@ -1629,7 +1630,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord138(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord138(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(277)));
@@ -1637,7 +1638,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord139(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord139(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(279)));
@@ -1645,7 +1646,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord140(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord140(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(281)));
@@ -1653,7 +1654,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord141(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord141(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(283)));
@@ -1661,7 +1662,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord142(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord142(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(285)));
@@ -1669,7 +1670,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord143(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord143(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(287)));
@@ -1677,7 +1678,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord144(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord144(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(289)));
@@ -1685,7 +1686,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord145(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord145(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(291)));
@@ -1693,7 +1694,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord146(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord146(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(293)));
@@ -1701,7 +1702,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord147(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord147(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(295)));
@@ -1709,7 +1710,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord148(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord148(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(297)));
@@ -1717,7 +1718,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord149(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord149(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(299)));
@@ -1725,7 +1726,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord150(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord150(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(301)));
@@ -1733,7 +1734,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord151(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord151(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(303)));
@@ -1741,7 +1742,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord152(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord152(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(305)));
@@ -1749,7 +1750,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord153(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord153(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(307)));
@@ -1757,7 +1758,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord154(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord154(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(309)));
@@ -1765,7 +1766,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord155(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord155(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(311)));
@@ -1773,7 +1774,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord156(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord156(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(313)));
@@ -1781,7 +1782,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord157(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord157(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(315)));
@@ -1789,7 +1790,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord158(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord158(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(317)));
@@ -1797,7 +1798,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord159(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord159(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(319)));
@@ -1805,7 +1806,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord160(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord160(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(321)));
@@ -1813,7 +1814,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord161(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord161(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(323)));
@@ -1821,7 +1822,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord162(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord162(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(325)));
@@ -1829,7 +1830,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord163(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord163(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(327)));
@@ -1837,7 +1838,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord164(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord164(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(329)));
@@ -1845,7 +1846,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord165(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord165(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(331)));
@@ -1853,7 +1854,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord166(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord166(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(333)));
@@ -1861,7 +1862,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord167(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord167(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(335)));
@@ -1869,7 +1870,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord168(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord168(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(337)));
@@ -1877,7 +1878,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord169(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord169(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(339)));
@@ -1885,7 +1886,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord170(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord170(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(341)));
@@ -1893,7 +1894,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord171(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord171(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(343)));
@@ -1901,7 +1902,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord172(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord172(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(345)));
@@ -1909,7 +1910,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord173(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord173(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(347)));
@@ -1917,7 +1918,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord174(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord174(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(349)));
@@ -1925,7 +1926,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord175(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord175(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(351)));
@@ -1933,7 +1934,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord176(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord176(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(353)));
@@ -1941,7 +1942,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord177(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord177(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(355)));
@@ -1949,7 +1950,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord178(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord178(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(357)));
@@ -1957,7 +1958,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord179(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord179(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(359)));
@@ -1965,7 +1966,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord180(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord180(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(361)));
@@ -1973,7 +1974,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord181(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord181(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(363)));
@@ -1981,7 +1982,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord182(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord182(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(365)));
@@ -1989,7 +1990,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord183(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord183(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(367)));
@@ -1997,7 +1998,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord184(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord184(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(369)));
@@ -2005,7 +2006,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord185(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord185(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(371)));
@@ -2013,7 +2014,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord186(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord186(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(373)));
@@ -2021,7 +2022,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord187(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord187(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(375)));
@@ -2029,7 +2030,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord188(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord188(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(377)));
@@ -2037,7 +2038,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord189(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord189(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(379)));
@@ -2045,7 +2046,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord190(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord190(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(381)));
@@ -2053,7 +2054,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord191(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord191(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(383)));
@@ -2061,7 +2062,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord192(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord192(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(385)));
@@ -2069,7 +2070,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord193(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord193(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(387)));
@@ -2077,7 +2078,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord194(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord194(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(389)));
@@ -2085,7 +2086,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord195(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord195(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(391)));
@@ -2093,7 +2094,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord196(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord196(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(393)));
@@ -2101,7 +2102,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord197(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord197(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(395)));
@@ -2109,7 +2110,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord198(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord198(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(397)));
@@ -2117,7 +2118,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord199(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord199(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(399)));
@@ -2125,7 +2126,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord200(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord200(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(401)));
@@ -2133,7 +2134,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord201(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord201(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(403)));
@@ -2141,7 +2142,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord202(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord202(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(405)));
@@ -2149,7 +2150,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord203(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord203(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(407)));
@@ -2157,7 +2158,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord204(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord204(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(409)));
@@ -2165,7 +2166,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord205(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord205(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(411)));
@@ -2173,7 +2174,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord206(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord206(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(413)));
@@ -2181,7 +2182,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord207(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord207(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(415)));
@@ -2189,7 +2190,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord208(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord208(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(417)));
@@ -2197,7 +2198,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord209(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord209(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(419)));
@@ -2205,7 +2206,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord210(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord210(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(421)));
@@ -2213,7 +2214,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord211(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord211(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(423)));
@@ -2221,7 +2222,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord212(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord212(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(425)));
@@ -2229,7 +2230,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord213(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord213(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(427)));
@@ -2237,7 +2238,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord214(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord214(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(429)));
@@ -2245,7 +2246,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord215(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord215(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(431)));
@@ -2253,7 +2254,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord216(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord216(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(433)));
@@ -2261,7 +2262,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord217(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord217(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(435)));
@@ -2269,7 +2270,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord218(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord218(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(437)));
@@ -2277,7 +2278,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord219(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord219(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(439)));
@@ -2285,7 +2286,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord220(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord220(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(441)));
@@ -2293,7 +2294,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord221(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord221(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(443)));
@@ -2301,7 +2302,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord222(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord222(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(445)));
@@ -2309,7 +2310,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord223(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord223(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(447)));
@@ -2317,7 +2318,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord224(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord224(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(449)));
@@ -2325,7 +2326,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord225(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord225(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(451)));
@@ -2333,7 +2334,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord226(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord226(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(453)));
@@ -2341,7 +2342,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord227(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord227(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(455)));
@@ -2349,7 +2350,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord228(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord228(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(457)));
@@ -2357,7 +2358,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord229(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord229(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(459)));
@@ -2365,7 +2366,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord230(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord230(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(461)));
@@ -2373,7 +2374,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord231(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord231(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(463)));
@@ -2381,7 +2382,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord232(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord232(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(465)));
@@ -2389,7 +2390,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord233(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord233(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(467)));
@@ -2397,7 +2398,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord234(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord234(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(469)));
@@ -2405,7 +2406,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord235(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord235(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(471)));
@@ -2413,7 +2414,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord236(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord236(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(473)));
@@ -2421,7 +2422,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord237(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord237(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(475)));
@@ -2429,7 +2430,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord238(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord238(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(477)));
@@ -2437,7 +2438,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord239(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord239(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(479)));
@@ -2445,7 +2446,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord240(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord240(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(481)));
@@ -2453,7 +2454,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord241(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord241(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(483)));
@@ -2461,7 +2462,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord242(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord242(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(485)));
@@ -2469,7 +2470,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord243(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord243(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(487)));
@@ -2477,7 +2478,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord244(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord244(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(489)));
@@ -2485,7 +2486,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord245(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord245(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(491)));
@@ -2493,7 +2494,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord246(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord246(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(493)));
@@ -2501,7 +2502,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord247(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord247(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(495)));
@@ -2509,7 +2510,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord248(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord248(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(497)));
@@ -2517,7 +2518,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord249(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord249(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(499)));
@@ -2525,7 +2526,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord250(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord250(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(501)));
@@ -2533,7 +2534,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord251(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord251(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(503)));
@@ -2541,7 +2542,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord252(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord252(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(505)));
@@ -2549,7 +2550,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord253(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord253(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(507)));
@@ -2557,7 +2558,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord254(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord254(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(509)));
@@ -2565,7 +2566,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord255(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord255(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(511)));
@@ -2573,7 +2574,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord256(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord256(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(513)));
@@ -2581,7 +2582,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord257(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord257(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(515)));
@@ -2589,7 +2590,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord258(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord258(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(517)));
@@ -2597,7 +2598,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord259(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord259(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(519)));
@@ -2605,7 +2606,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord260(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord260(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(521)));
@@ -2613,7 +2614,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord261(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord261(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(523)));
@@ -2621,7 +2622,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord262(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord262(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(525)));
@@ -2629,7 +2630,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord263(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord263(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(527)));
@@ -2637,7 +2638,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord264(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord264(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(529)));
@@ -2645,7 +2646,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord265(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord265(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(531)));
@@ -2653,7 +2654,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord266(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord266(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(533)));
@@ -2661,7 +2662,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord267(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord267(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(535)));
@@ -2669,7 +2670,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord268(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord268(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(537)));
@@ -2677,7 +2678,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord269(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord269(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(539)));
@@ -2685,7 +2686,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord270(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord270(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(541)));
@@ -2693,7 +2694,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord271(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord271(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(543)));
@@ -2701,7 +2702,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord272(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord272(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(545)));
@@ -2709,7 +2710,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord273(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord273(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(547)));
@@ -2717,7 +2718,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord274(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord274(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(549)));
@@ -2725,7 +2726,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord275(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord275(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(551)));
@@ -2733,7 +2734,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord276(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord276(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(553)));
@@ -2741,7 +2742,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord277(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord277(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(555)));
@@ -2749,7 +2750,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord278(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord278(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(557)));
@@ -2757,7 +2758,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord279(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord279(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(559)));
@@ -2765,7 +2766,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord280(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord280(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(561)));
@@ -2773,7 +2774,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord281(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord281(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(563)));
@@ -2781,7 +2782,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord282(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord282(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(565)));
@@ -2789,7 +2790,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord283(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord283(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(567)));
@@ -2797,7 +2798,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord284(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord284(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(569)));
@@ -2805,7 +2806,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord285(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord285(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(571)));
@@ -2813,7 +2814,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord286(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord286(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(573)));
@@ -2821,7 +2822,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord287(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord287(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(575)));
@@ -2829,7 +2830,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord288(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord288(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(577)));
@@ -2837,7 +2838,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord289(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord289(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(579)));
@@ -2845,7 +2846,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord290(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord290(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(581)));
@@ -2853,7 +2854,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord291(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord291(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(583)));
@@ -2861,7 +2862,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord292(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord292(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(585)));
@@ -2869,7 +2870,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord293(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord293(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(587)));
@@ -2877,7 +2878,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord294(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord294(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(589)));
@@ -2885,7 +2886,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord295(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord295(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(591)));
@@ -2893,7 +2894,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord296(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord296(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(593)));
@@ -2901,7 +2902,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord297(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord297(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(595)));
@@ -2909,7 +2910,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord298(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord298(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(597)));
@@ -2917,7 +2918,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord299(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord299(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(599)));
@@ -2925,7 +2926,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord300(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord300(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(601)));
@@ -2933,7 +2934,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord301(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord301(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(603)));
@@ -2941,7 +2942,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord302(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord302(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(605)));
@@ -2949,7 +2950,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord303(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord303(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(607)));
@@ -2957,7 +2958,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord304(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord304(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(609)));
@@ -2965,7 +2966,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord305(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord305(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(611)));
@@ -2973,7 +2974,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord306(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord306(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(613)));
@@ -2981,7 +2982,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord307(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord307(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(615)));
@@ -2989,7 +2990,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord308(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord308(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(617)));
@@ -2997,7 +2998,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord309(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord309(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(619)));
@@ -3005,7 +3006,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord310(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord310(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(621)));
@@ -3013,7 +3014,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord311(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord311(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(623)));
@@ -3021,7 +3022,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord312(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord312(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(625)));
@@ -3029,7 +3030,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord313(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord313(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(627)));
@@ -3037,7 +3038,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord314(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord314(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(629)));
@@ -3045,7 +3046,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord315(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord315(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(631)));
@@ -3053,7 +3054,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord316(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord316(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(633)));
@@ -3061,7 +3062,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord317(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord317(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(635)));
@@ -3069,7 +3070,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord318(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord318(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(637)));
@@ -3077,7 +3078,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord319(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord319(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(639)));
@@ -3085,7 +3086,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord320(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord320(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(641)));
@@ -3093,7 +3094,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord321(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord321(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(643)));
@@ -3101,7 +3102,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord322(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord322(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(645)));
@@ -3109,7 +3110,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord323(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord323(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(647)));
@@ -3117,7 +3118,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord324(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord324(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(649)));
@@ -3125,7 +3126,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord325(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord325(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(651)));
@@ -3133,7 +3134,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord326(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord326(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(653)));
@@ -3141,7 +3142,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord327(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord327(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(655)));
@@ -3149,7 +3150,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord328(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord328(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(657)));
@@ -3157,7 +3158,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord329(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord329(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(659)));
@@ -3165,7 +3166,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord330(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord330(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(661)));
@@ -3173,7 +3174,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord331(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord331(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(663)));
@@ -3181,7 +3182,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord332(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord332(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(665)));
@@ -3189,7 +3190,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord333(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord333(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(667)));
@@ -3197,7 +3198,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord334(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord334(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(669)));
@@ -3205,7 +3206,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord335(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord335(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(671)));
@@ -3213,7 +3214,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord336(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord336(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(673)));
@@ -3221,7 +3222,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord337(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord337(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(675)));
@@ -3229,7 +3230,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord338(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord338(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(677)));
@@ -3237,7 +3238,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord339(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord339(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(679)));
@@ -3245,7 +3246,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord340(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord340(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(681)));
@@ -3253,7 +3254,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord341(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord341(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(683)));
@@ -3261,7 +3262,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord342(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord342(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(685)));
@@ -3269,7 +3270,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord343(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord343(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(687)));
@@ -3277,7 +3278,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord344(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord344(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(689)));
@@ -3285,7 +3286,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord345(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord345(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(691)));
@@ -3293,7 +3294,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord346(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord346(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(693)));
@@ -3301,7 +3302,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord347(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord347(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(695)));
@@ -3309,7 +3310,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord348(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord348(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(697)));
@@ -3317,7 +3318,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord349(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord349(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(699)));
@@ -3325,7 +3326,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord350(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord350(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(701)));
@@ -3333,7 +3334,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord351(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord351(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(703)));
@@ -3341,7 +3342,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord352(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord352(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(705)));
@@ -3349,7 +3350,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord353(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord353(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(707)));
@@ -3357,7 +3358,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord354(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord354(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(709)));
@@ -3365,7 +3366,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord355(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord355(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(711)));
@@ -3373,7 +3374,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord356(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord356(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(713)));
@@ -3381,7 +3382,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord357(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord357(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(715)));
@@ -3389,7 +3390,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord358(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord358(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(717)));
@@ -3397,7 +3398,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord359(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord359(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(719)));
@@ -3405,7 +3406,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord360(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord360(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(721)));
@@ -3413,7 +3414,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord361(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord361(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(723)));
@@ -3421,7 +3422,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord362(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord362(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(725)));
@@ -3429,7 +3430,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord363(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord363(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(727)));
@@ -3437,7 +3438,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord364(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord364(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(729)));
@@ -3445,7 +3446,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord365(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord365(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(731)));
@@ -3453,7 +3454,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord366(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord366(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(733)));
@@ -3461,7 +3462,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord367(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord367(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(735)));
@@ -3469,7 +3470,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord368(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord368(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(737)));
@@ -3477,7 +3478,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord369(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord369(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(739)));
@@ -3485,7 +3486,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord370(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord370(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(741)));
@@ -3493,7 +3494,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord371(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord371(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(743)));
@@ -3501,7 +3502,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord372(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord372(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(745)));
@@ -3509,7 +3510,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord373(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord373(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(747)));
@@ -3517,7 +3518,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord374(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord374(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(749)));
@@ -3525,7 +3526,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord375(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord375(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(751)));
@@ -3533,7 +3534,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord376(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord376(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(753)));
@@ -3541,7 +3542,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord377(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord377(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(755)));
@@ -3549,7 +3550,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord378(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord378(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(757)));
@@ -3557,7 +3558,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord379(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord379(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(759)));
@@ -3565,7 +3566,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord380(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord380(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(761)));
@@ -3573,7 +3574,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord381(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord381(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(763)));
@@ -3581,7 +3582,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord382(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord382(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(765)));
@@ -3589,7 +3590,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord383(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord383(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(767)));
@@ -3597,7 +3598,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord384(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord384(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(769)));
@@ -3605,7 +3606,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord385(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord385(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(771)));
@@ -3613,7 +3614,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord386(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord386(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(773)));
@@ -3621,7 +3622,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord387(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord387(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(775)));
@@ -3629,7 +3630,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord388(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord388(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(777)));
@@ -3637,7 +3638,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord389(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord389(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(779)));
@@ -3645,7 +3646,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord390(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord390(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(781)));
@@ -3653,7 +3654,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord391(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord391(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(783)));
@@ -3661,7 +3662,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord392(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord392(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(785)));
@@ -3669,7 +3670,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord393(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord393(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(787)));
@@ -3677,7 +3678,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord394(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord394(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(789)));
@@ -3685,7 +3686,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord395(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord395(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(791)));
@@ -3693,7 +3694,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord396(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord396(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(793)));
@@ -3701,7 +3702,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord397(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord397(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(795)));
@@ -3709,7 +3710,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord398(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord398(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(797)));
@@ -3717,7 +3718,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord399(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord399(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(799)));
@@ -3725,7 +3726,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord400(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord400(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(801)));
@@ -3733,7 +3734,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord401(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord401(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(803)));
@@ -3741,7 +3742,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord402(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord402(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(805)));
@@ -3749,7 +3750,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord403(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord403(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(807)));
@@ -3757,7 +3758,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord404(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord404(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(809)));
@@ -3765,7 +3766,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord405(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord405(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(811)));
@@ -3773,7 +3774,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord406(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord406(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(813)));
@@ -3781,7 +3782,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord407(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord407(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(815)));
@@ -3789,7 +3790,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord408(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord408(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(817)));
@@ -3797,7 +3798,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord409(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord409(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(819)));
@@ -3805,7 +3806,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord410(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord410(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(821)));
@@ -3813,7 +3814,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord411(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord411(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(823)));
@@ -3821,7 +3822,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord412(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord412(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(825)));
@@ -3829,7 +3830,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord413(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord413(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(827)));
@@ -3837,7 +3838,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord414(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord414(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(829)));
@@ -3845,7 +3846,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord415(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord415(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(831)));
@@ -3853,7 +3854,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord416(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord416(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(833)));
@@ -3861,7 +3862,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord417(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord417(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(835)));
@@ -3869,7 +3870,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord418(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord418(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(837)));
@@ -3877,7 +3878,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord419(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord419(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(839)));
@@ -3885,7 +3886,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord420(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord420(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(841)));
@@ -3893,7 +3894,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord421(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord421(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(843)));
@@ -3901,7 +3902,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord422(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord422(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(845)));
@@ -3909,7 +3910,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord423(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord423(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(847)));
@@ -3917,7 +3918,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord424(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord424(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(849)));
@@ -3925,7 +3926,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord425(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord425(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(851)));
@@ -3933,7 +3934,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord426(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord426(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(853)));
@@ -3941,7 +3942,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord427(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord427(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(855)));
@@ -3949,7 +3950,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord428(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord428(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(857)));
@@ -3957,7 +3958,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord429(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord429(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(859)));
@@ -3965,7 +3966,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord430(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord430(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(861)));
@@ -3973,7 +3974,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord431(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord431(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(863)));
@@ -3981,7 +3982,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord432(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord432(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(865)));
@@ -3989,7 +3990,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord433(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord433(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(867)));
@@ -3997,7 +3998,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord434(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord434(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(869)));
@@ -4005,7 +4006,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord435(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord435(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(871)));
@@ -4013,7 +4014,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord436(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord436(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(873)));
@@ -4021,7 +4022,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord437(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord437(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(875)));
@@ -4029,7 +4030,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord438(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord438(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(877)));
@@ -4037,7 +4038,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord439(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord439(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(879)));
@@ -4045,7 +4046,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord440(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord440(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(881)));
@@ -4053,7 +4054,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord441(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord441(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(883)));
@@ -4061,7 +4062,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord442(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord442(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(885)));
@@ -4069,7 +4070,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord443(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord443(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(887)));
@@ -4077,7 +4078,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord444(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord444(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(889)));
@@ -4085,7 +4086,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord445(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord445(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(891)));
@@ -4093,7 +4094,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord446(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord446(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(893)));
@@ -4101,7 +4102,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord447(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord447(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(895)));
@@ -4109,7 +4110,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord448(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord448(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(897)));
@@ -4117,7 +4118,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord449(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord449(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(899)));
@@ -4125,7 +4126,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord450(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord450(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(901)));
@@ -4133,7 +4134,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord451(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord451(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(903)));
@@ -4141,7 +4142,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord452(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord452(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(905)));
@@ -4149,7 +4150,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord453(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord453(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(907)));
@@ -4157,7 +4158,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord454(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord454(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(909)));
@@ -4165,7 +4166,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord455(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord455(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(911)));
@@ -4173,7 +4174,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord456(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord456(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(913)));
@@ -4181,7 +4182,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord457(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord457(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(915)));
@@ -4189,7 +4190,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord458(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord458(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(917)));
@@ -4197,7 +4198,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord459(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord459(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(919)));
@@ -4205,7 +4206,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord460(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord460(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(921)));
@@ -4213,7 +4214,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord461(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord461(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(923)));
@@ -4221,7 +4222,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord462(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord462(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(925)));
@@ -4229,7 +4230,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord463(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord463(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(927)));
@@ -4237,7 +4238,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord464(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord464(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(929)));
@@ -4245,7 +4246,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord465(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord465(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(931)));
@@ -4253,7 +4254,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord466(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord466(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(933)));
@@ -4261,7 +4262,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord467(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord467(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(935)));
@@ -4269,7 +4270,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord468(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord468(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(937)));
@@ -4277,7 +4278,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord469(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord469(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(939)));
@@ -4285,7 +4286,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord470(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord470(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(941)));
@@ -4293,7 +4294,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord471(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord471(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(943)));
@@ -4301,7 +4302,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord472(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord472(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(945)));
@@ -4309,7 +4310,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord473(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord473(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(947)));
@@ -4317,7 +4318,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord474(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord474(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(949)));
@@ -4325,7 +4326,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord475(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord475(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(951)));
@@ -4333,7 +4334,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord476(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord476(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(953)));
@@ -4341,7 +4342,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord477(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord477(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(955)));
@@ -4349,7 +4350,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord478(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord478(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(957)));
@@ -4357,7 +4358,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord479(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord479(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(959)));
@@ -4365,7 +4366,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord480(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord480(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(961)));
@@ -4373,7 +4374,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord481(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord481(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(963)));
@@ -4381,7 +4382,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord482(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord482(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(965)));
@@ -4389,7 +4390,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord483(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord483(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(967)));
@@ -4397,7 +4398,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord484(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord484(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(969)));
@@ -4405,7 +4406,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord485(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord485(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(971)));
@@ -4413,7 +4414,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord486(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord486(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(973)));
@@ -4421,7 +4422,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord487(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord487(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(975)));
@@ -4429,7 +4430,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord488(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord488(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(977)));
@@ -4437,7 +4438,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord489(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord489(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(979)));
@@ -4445,7 +4446,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord490(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord490(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(981)));
@@ -4453,7 +4454,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord491(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord491(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(983)));
@@ -4461,7 +4462,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord492(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord492(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(985)));
@@ -4469,7 +4470,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord493(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord493(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(987)));
@@ -4477,7 +4478,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord494(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord494(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(989)));
@@ -4485,7 +4486,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord495(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord495(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(991)));
@@ -4493,7 +4494,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord496(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord496(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(993)));
@@ -4501,7 +4502,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord497(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord497(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(995)));
@@ -4509,7 +4510,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord498(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord498(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(997)));
@@ -4517,7 +4518,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRe
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord499(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldSerializeLargeRecord499(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(999)));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums_GenericSerializer_496788239.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums_GenericSerializer_496788239.java
index 66f7bc80c..bb73a8da0 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums_GenericSerializer_496788239.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums_GenericSerializer_496788239.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.GenericEnumSymbol;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
@@ -13,14 +14,14 @@ public class FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnum
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         int valueToWrite0;
@@ -31,12 +32,12 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecord
             valueToWrite0 = ((org.apache.avro.generic.GenericData.EnumSymbol) enumValue0).getSchema().getEnumOrdinal(((org.apache.avro.generic.GenericData.EnumSymbol) enumValue0).toString());
         }
         (encoder).writeEnum(valueToWrite0);
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums0(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums1(data, (encoder));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums0(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums1(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         GenericEnumSymbol testEnumUnion0 = ((GenericEnumSymbol) data.get(1));
@@ -78,7 +79,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericReco
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums1(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithEnums1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<GenericEnumSymbol> testEnumUnionArray0 = ((List<GenericEnumSymbol> ) data.get(3));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed_GenericSerializer_1473954146.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed_GenericSerializer_1473954146.java
index 5fce5b2df..044706698 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed_GenericSerializer_1473954146.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed_GenericSerializer_1473954146.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.GenericFixed;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
@@ -13,23 +14,23 @@ public class FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixe
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeFixed(((GenericFixed) data.get(0)).bytes());
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed0(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed1(data, (encoder));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed0(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed1(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         GenericFixed testFixedUnion0 = ((GenericFixed) data.get(1));
@@ -57,7 +58,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericReco
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed1(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteGenericRecordWithFixed1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<GenericFixed> testFixedUnionArray0 = ((List<GenericFixed> ) data.get(3));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion_GenericSerializer_1076995050.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion_GenericSerializer_1076995050.java
index f99a1a390..c02cdddf2 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion_GenericSerializer_1076995050.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion_GenericSerializer_1076995050.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -12,14 +13,14 @@ public class FastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion_G
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldWriteMultipleChoiceUnion0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object union0 = ((Object) data.get(0));
@@ -29,7 +30,7 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteMultipleChoic
         } else {
             if ((union0 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.subRecord".equals(((IndexedRecord) union0).getSchema().getFullName())) {
                 (encoder).writeIndex(1);
-                serializeSubRecord0(((IndexedRecord) union0), (encoder));
+                serializeSubRecord0(((IndexedRecord) union0), (encoder), (customization));
             } else {
                 if (union0 instanceof CharSequence) {
                     (encoder).writeIndex(2);
@@ -49,7 +50,7 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteMultipleChoic
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeSubRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeSubRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence subField0 = ((CharSequence) data.get(0));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWritePrimitives_GenericSerializer_538850553.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWritePrimitives_GenericSerializer_538850553.java
index 5a6e2cf33..121c4b924 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWritePrimitives_GenericSerializer_538850553.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWritePrimitives_GenericSerializer_538850553.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -13,28 +14,28 @@ public class FastGenericSerializerGeneratorTest_shouldWritePrimitives_GenericSer
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldWritePrimitives0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldWritePrimitives0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldWritePrimitives0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldWritePrimitives0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(0)));
-        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives0(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives1(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives2(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives3(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives4(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives5(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives6(data, (encoder));
+        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives0(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives1(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives2(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives3(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives4(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives5(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives6(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Integer testIntUnion0 = ((Integer) data.get(1));
@@ -56,7 +57,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives0
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives1(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         if (((CharSequence) data.get(3)) instanceof Utf8) {
@@ -79,7 +80,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives1
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives2(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives2(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeLong(((Long) data.get(5)));
@@ -94,7 +95,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives2
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives3(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives3(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeDouble(((Double) data.get(7)));
@@ -109,7 +110,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives3
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives4(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives4(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeFloat(((Float) data.get(9)));
@@ -124,7 +125,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives4
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives5(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives5(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeBoolean(((Boolean) data.get(11)));
@@ -139,7 +140,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives5
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives6(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWritePrimitives6(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeBytes(((ByteBuffer) data.get(13)));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex_GenericSerializer_31578414.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex_GenericSerializer_31578414.java
index 09834ebc2..2e314d23e 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex_GenericSerializer_31578414.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex_GenericSerializer_31578414.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -12,14 +13,14 @@ public class FastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex_Gener
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldWriteRightUnionIndex0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object union_field0 = ((Object) data.get(0));
@@ -29,18 +30,18 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteRightUnionInd
         } else {
             if ((union_field0 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.record1".equals(((IndexedRecord) union_field0).getSchema().getFullName())) {
                 (encoder).writeIndex(1);
-                serializeRecord10(((IndexedRecord) union_field0), (encoder));
+                serializeRecord10(((IndexedRecord) union_field0), (encoder), (customization));
             } else {
                 if ((union_field0 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.record2".equals(((IndexedRecord) union_field0).getSchema().getFullName())) {
                     (encoder).writeIndex(2);
-                    serializeRecord20(((IndexedRecord) union_field0), (encoder));
+                    serializeRecord20(((IndexedRecord) union_field0), (encoder), (customization));
                 }
             }
         }
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeRecord10(IndexedRecord data, Encoder encoder)
+    public void serializeRecord10(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         if (((CharSequence) data.get(0)) instanceof Utf8) {
@@ -51,7 +52,7 @@ public void serializeRecord10(IndexedRecord data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeRecord20(IndexedRecord data, Encoder encoder)
+    public void serializeRecord20(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         if (((CharSequence) data.get(0)) instanceof Utf8) {
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField_GenericSerializer_1348736347.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField_GenericSerializer_1348736347.java
index b518ccb6b..2f8c28e23 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField_GenericSerializer_1348736347.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField_GenericSerializer_1348736347.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -14,14 +15,14 @@ public class FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsF
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<IndexedRecord> recordsArray0 = ((List<IndexedRecord> ) data.get(0));
@@ -34,16 +35,16 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordColl
                 (encoder).startItem();
                 IndexedRecord subRecord0 = null;
                 subRecord0 = ((List<IndexedRecord> ) recordsArray0).get(counter0);
-                serializeSubRecord0(subRecord0, (encoder));
+                serializeSubRecord0(subRecord0, (encoder), (customization));
             }
         }
         (encoder).writeArrayEnd();
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField0(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField1(data, (encoder));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField0(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField1(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeSubRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeSubRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence subField0 = ((CharSequence) data.get(0));
@@ -61,10 +62,11 @@ public void serializeSubRecord0(IndexedRecord data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Map<CharSequence, IndexedRecord> recordsMap0 = ((Map<CharSequence, IndexedRecord> ) data.get(1));
+        (customization).getCheckMapTypeFunction().apply(recordsMap0);
         (encoder).writeMapStart();
         if ((recordsMap0 == null)||recordsMap0 .isEmpty()) {
             (encoder).setItemCount(0);
@@ -75,7 +77,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
                 (encoder).writeString(key0);
                 IndexedRecord subRecord1 = null;
                 subRecord1 = ((Map<CharSequence, IndexedRecord> ) recordsMap0).get(key0);
-                serializeSubRecord0(subRecord1, (encoder));
+                serializeSubRecord0(subRecord1, (encoder), (customization));
             }
         }
         (encoder).writeMapEnd();
@@ -101,7 +103,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
                         } else {
                             if ((union0 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.subRecord".equals(((IndexedRecord) union0).getSchema().getFullName())) {
                                 (encoder).writeIndex(1);
-                                serializeSubRecord0(((IndexedRecord) union0), (encoder));
+                                serializeSubRecord0(((IndexedRecord) union0), (encoder), (customization));
                             }
                         }
                     }
@@ -112,7 +114,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField1(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCollectionsField1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Map<CharSequence, IndexedRecord> recordsMapUnion0 = ((Map<CharSequence, IndexedRecord> ) data.get(3));
@@ -122,6 +124,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
         } else {
             if (recordsMapUnion0 instanceof Map) {
                 (encoder).writeIndex(1);
+                (customization).getCheckMapTypeFunction().apply(((Map<CharSequence, IndexedRecord> ) recordsMapUnion0));
                 (encoder).writeMapStart();
                 if ((((Map<CharSequence, IndexedRecord> ) recordsMapUnion0) == null)||((Map<CharSequence, IndexedRecord> ) recordsMapUnion0).isEmpty()) {
                     (encoder).setItemCount(0);
@@ -138,7 +141,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
                         } else {
                             if ((union1 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.subRecord".equals(((IndexedRecord) union1).getSchema().getFullName())) {
                                 (encoder).writeIndex(1);
-                                serializeSubRecord0(((IndexedRecord) union1), (encoder));
+                                serializeSubRecord0(((IndexedRecord) union1), (encoder), (customization));
                             }
                         }
                     }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField_GenericSerializer_1813582373.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField_GenericSerializer_1813582373.java
index e75b442cd..b98242249 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField_GenericSerializer_1813582373.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField_GenericSerializer_1813582373.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -14,14 +15,14 @@ public class FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexColle
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<Map<CharSequence, IndexedRecord>> recordsArrayMap0 = ((List<Map<CharSequence, IndexedRecord>> ) data.get(0));
@@ -34,6 +35,7 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordComp
                 (encoder).startItem();
                 Map<CharSequence, IndexedRecord> map0 = null;
                 map0 = ((List<Map<CharSequence, IndexedRecord>> ) recordsArrayMap0).get(counter0);
+                (customization).getCheckMapTypeFunction().apply(map0);
                 (encoder).writeMapStart();
                 if ((map0 == null)||map0 .isEmpty()) {
                     (encoder).setItemCount(0);
@@ -50,7 +52,7 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordComp
                         } else {
                             if ((union0 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.subRecord".equals(((IndexedRecord) union0).getSchema().getFullName())) {
                                 (encoder).writeIndex(1);
-                                serializeSubRecord0(((IndexedRecord) union0), (encoder));
+                                serializeSubRecord0(((IndexedRecord) union0), (encoder), (customization));
                             }
                         }
                     }
@@ -59,12 +61,12 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordComp
             }
         }
         (encoder).writeArrayEnd();
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField0(data, (encoder));
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField1(data, (encoder));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField0(data, (encoder), (customization));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField1(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeSubRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeSubRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence subField0 = ((CharSequence) data.get(0));
@@ -82,10 +84,11 @@ public void serializeSubRecord0(IndexedRecord data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Map<CharSequence, List<IndexedRecord>> recordsMapArray0 = ((Map<CharSequence, List<IndexedRecord>> ) data.get(1));
+        (customization).getCheckMapTypeFunction().apply(recordsMapArray0);
         (encoder).writeMapStart();
         if ((recordsMapArray0 == null)||recordsMapArray0 .isEmpty()) {
             (encoder).setItemCount(0);
@@ -111,7 +114,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
                         } else {
                             if ((union1 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.subRecord".equals(((IndexedRecord) union1).getSchema().getFullName())) {
                                 (encoder).writeIndex(1);
-                                serializeSubRecord0(((IndexedRecord) union1), (encoder));
+                                serializeSubRecord0(((IndexedRecord) union1), (encoder), (customization));
                             }
                         }
                     }
@@ -136,6 +139,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
                         (encoder).startItem();
                         Map<CharSequence, IndexedRecord> map1 = null;
                         map1 = ((List<Map<CharSequence, IndexedRecord>> )((List<Map<CharSequence, IndexedRecord>> ) recordsArrayMapUnion0)).get(counter2);
+                        (customization).getCheckMapTypeFunction().apply(map1);
                         (encoder).writeMapStart();
                         if ((map1 == null)||map1 .isEmpty()) {
                             (encoder).setItemCount(0);
@@ -152,7 +156,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
                                 } else {
                                     if ((union2 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.subRecord".equals(((IndexedRecord) union2).getSchema().getFullName())) {
                                         (encoder).writeIndex(1);
-                                        serializeSubRecord0(((IndexedRecord) union2), (encoder));
+                                        serializeSubRecord0(((IndexedRecord) union2), (encoder), (customization));
                                     }
                                 }
                             }
@@ -166,7 +170,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField1(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordComplexCollectionsField1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Map<CharSequence, List<IndexedRecord>> recordsMapArrayUnion0 = ((Map<CharSequence, List<IndexedRecord>> ) data.get(3));
@@ -176,6 +180,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
         } else {
             if (recordsMapArrayUnion0 instanceof Map) {
                 (encoder).writeIndex(1);
+                (customization).getCheckMapTypeFunction().apply(((Map<CharSequence, List<IndexedRecord>> ) recordsMapArrayUnion0));
                 (encoder).writeMapStart();
                 if ((((Map<CharSequence, List<IndexedRecord>> ) recordsMapArrayUnion0) == null)||((Map<CharSequence, List<IndexedRecord>> ) recordsMapArrayUnion0).isEmpty()) {
                     (encoder).setItemCount(0);
@@ -201,7 +206,7 @@ private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordCo
                                 } else {
                                     if ((union3 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.subRecord".equals(((IndexedRecord) union3).getSchema().getFullName())) {
                                         (encoder).writeIndex(1);
-                                        serializeSubRecord0(((IndexedRecord) union3), (encoder));
+                                        serializeSubRecord0(((IndexedRecord) union3), (encoder), (customization));
                                     }
                                 }
                             }
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordField_GenericSerializer_652769027.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordField_GenericSerializer_652769027.java
index f2ec5530a..459ce6a0e 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordField_GenericSerializer_652769027.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastGenericSerializerGeneratorTest_shouldWriteSubRecordField_GenericSerializer_652769027.java
@@ -3,6 +3,7 @@
 
 import java.io.IOException;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -12,14 +13,14 @@ public class FastGenericSerializerGeneratorTest_shouldWriteSubRecordField_Generi
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordField0(data, (encoder));
+        serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordField0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordField0(IndexedRecord data, Encoder encoder)
+    public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordField0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         IndexedRecord record0 = ((IndexedRecord) data.get(0));
@@ -29,14 +30,14 @@ public void serializeFastGenericSerializerGeneratorTest_shouldWriteSubRecordFiel
         } else {
             if ((record0 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.subRecord".equals(((IndexedRecord) record0).getSchema().getFullName())) {
                 (encoder).writeIndex(1);
-                serializeSubRecord0(((IndexedRecord) record0), (encoder));
+                serializeSubRecord0(((IndexedRecord) record0), (encoder), (customization));
             }
         }
-        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordField0(data, (encoder));
+        serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordField0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeSubRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeSubRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence subField0 = ((CharSequence) data.get(0));
@@ -54,11 +55,11 @@ public void serializeSubRecord0(IndexedRecord data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordField0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastGenericSerializerGeneratorTest_shouldWriteSubRecordField0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         IndexedRecord record10 = ((IndexedRecord) data.get(1));
-        serializeSubRecord0(record10, (encoder));
+        serializeSubRecord0(record10, (encoder), (customization));
         CharSequence field0 = ((CharSequence) data.get(2));
         if (field0 == null) {
             (encoder).writeIndex(0);
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeEnums_GenericSerializer_957378572.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeEnums_GenericSerializer_957378572.java
index f249b3c5d..a98db50f1 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeEnums_GenericSerializer_957378572.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeEnums_GenericSerializer_957378572.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.GenericEnumSymbol;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
@@ -14,14 +15,14 @@ public class FastSerdeEnums_GenericSerializer_957378572
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastSerdeEnums0(data, (encoder));
+        serializeFastSerdeEnums0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastSerdeEnums0(IndexedRecord data, Encoder encoder)
+    public void serializeFastSerdeEnums0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         int valueToWrite0;
@@ -32,11 +33,11 @@ public void serializeFastSerdeEnums0(IndexedRecord data, Encoder encoder)
             valueToWrite0 = ((org.apache.avro.generic.GenericData.EnumSymbol) enumValue0).getSchema().getEnumOrdinal(((org.apache.avro.generic.GenericData.EnumSymbol) enumValue0).toString());
         }
         (encoder).writeEnum(valueToWrite0);
-        serialize_FastSerdeEnums0(data, (encoder));
+        serialize_FastSerdeEnums0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeEnums0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeEnums0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<GenericEnumSymbol> arrayOfEnums0 = ((List<GenericEnumSymbol> ) data.get(1));
@@ -67,6 +68,7 @@ private void serialize_FastSerdeEnums0(IndexedRecord data, Encoder encoder)
             }
         }
         Map<CharSequence, GenericEnumSymbol> mapOfEnums0 = ((Map<CharSequence, GenericEnumSymbol> ) data.get(2));
+        (customization).getCheckMapTypeFunction().apply(mapOfEnums0);
         (encoder).writeMapStart();
         if ((mapOfEnums0 == null)||mapOfEnums0 .isEmpty()) {
             (encoder).setItemCount(0);
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeFixed_GenericSerializer_504108934.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeFixed_GenericSerializer_504108934.java
index 23e5625fc..bb5e381a6 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeFixed_GenericSerializer_504108934.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeFixed_GenericSerializer_504108934.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.GenericFixed;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
@@ -14,22 +15,22 @@ public class FastSerdeFixed_GenericSerializer_504108934
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastSerdeFixed0(data, (encoder));
+        serializeFastSerdeFixed0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastSerdeFixed0(IndexedRecord data, Encoder encoder)
+    public void serializeFastSerdeFixed0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeFixed(((GenericFixed) data.get(0)).bytes());
-        serialize_FastSerdeFixed0(data, (encoder));
+        serialize_FastSerdeFixed0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeFixed0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeFixed0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<GenericFixed> arrayOfFixed0 = ((List<GenericFixed> ) data.get(1));
@@ -53,6 +54,7 @@ private void serialize_FastSerdeFixed0(IndexedRecord data, Encoder encoder)
             }
         }
         Map<CharSequence, GenericFixed> mapOfFixed0 = ((Map<CharSequence, GenericFixed> ) data.get(2));
+        (customization).getCheckMapTypeFunction().apply(mapOfFixed0);
         (encoder).writeMapStart();
         if ((mapOfFixed0 == null)||mapOfFixed0 .isEmpty()) {
             (encoder).setItemCount(0);
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesDefined_GenericSerializer_229156053.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesDefined_GenericSerializer_229156053.java
index 93551504e..4aa601f55 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesDefined_GenericSerializer_229156053.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesDefined_GenericSerializer_229156053.java
@@ -6,6 +6,7 @@
 import java.time.LocalDate;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.Conversions;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -22,24 +23,24 @@ public class FastSerdeLogicalTypesDefined_GenericSerializer_229156053
     private final Schema logicalTypeSchema__59052268 = Schema.parse("{\"type\":\"int\",\"logicalType\":\"date\"}");
     private final Schema logicalTypeSchema_1074306973 = Schema.parse("{\"type\":\"long\",\"logicalType\":\"timestamp-millis\"}");
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastSerdeLogicalTypesDefined0(data, (encoder));
+        serializeFastSerdeLogicalTypesDefined0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastSerdeLogicalTypesDefined0(IndexedRecord data, Encoder encoder)
+    public void serializeFastSerdeLogicalTypesDefined0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue0 = data.get(0);
         convertedValue0 = Conversions.convertToRawType(convertedValue0, this.logicalTypeSchema__419105534, this.logicalTypeSchema__419105534 .getLogicalType(), this.conversion_time_millis);
         (encoder).writeInt(((Integer) convertedValue0));
-        serialize_FastSerdeLogicalTypesDefined0(data, (encoder));
+        serialize_FastSerdeLogicalTypesDefined0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesDefined0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesDefined0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue1 = data.get(1);
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesDefined_SpecificSerializer_229156053.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesDefined_SpecificSerializer_229156053.java
index e3bb785c0..cd9a62d31 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesDefined_SpecificSerializer_229156053.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesDefined_SpecificSerializer_229156053.java
@@ -6,6 +6,7 @@
 import java.time.LocalDate;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesDefined;
 import org.apache.avro.Conversions;
 import org.apache.avro.Schema;
@@ -22,24 +23,24 @@ public class FastSerdeLogicalTypesDefined_SpecificSerializer_229156053
     private final Schema logicalTypeSchema__59052268 = Schema.parse("{\"type\":\"int\",\"logicalType\":\"date\"}");
     private final Schema logicalTypeSchema_1074306973 = Schema.parse("{\"type\":\"long\",\"logicalType\":\"timestamp-millis\"}");
 
-    public void serialize(FastSerdeLogicalTypesDefined data, Encoder encoder)
+    public void serialize(FastSerdeLogicalTypesDefined data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastSerdeLogicalTypesDefined0(data, (encoder));
+        serializeFastSerdeLogicalTypesDefined0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastSerdeLogicalTypesDefined0(FastSerdeLogicalTypesDefined data, Encoder encoder)
+    public void serializeFastSerdeLogicalTypesDefined0(FastSerdeLogicalTypesDefined data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue0 = data.get(0);
         convertedValue0 = Conversions.convertToRawType(convertedValue0, this.logicalTypeSchema__419105534, this.logicalTypeSchema__419105534 .getLogicalType(), this.conversion_time_millis);
         (encoder).writeInt(((Integer) convertedValue0));
-        serialize_FastSerdeLogicalTypesDefined0(data, (encoder));
+        serialize_FastSerdeLogicalTypesDefined0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesDefined0(FastSerdeLogicalTypesDefined data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesDefined0(FastSerdeLogicalTypesDefined data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue1 = data.get(1);
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesTest1_GenericSerializer_1007574890.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesTest1_GenericSerializer_1007574890.java
index c0c98c372..3803b1c96 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesTest1_GenericSerializer_1007574890.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesTest1_GenericSerializer_1007574890.java
@@ -12,6 +12,7 @@
 import java.util.Map;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.Conversions;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.IndexedRecord;
@@ -39,14 +40,14 @@ public class FastSerdeLogicalTypesTest1_GenericSerializer_1007574890
     private final Schema logicalTypeSchema__1515894331 = Schema.parse("{\"type\":\"long\",\"logicalType\":\"time-micros\"}");
     private final Schema logicalTypeSchema__250645780 = Schema.parse("{\"type\":\"long\",\"logicalType\":\"local-timestamp-millis\"}");
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastSerdeLogicalTypesTest10(data, (encoder));
+        serializeFastSerdeLogicalTypesTest10(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastSerdeLogicalTypesTest10(IndexedRecord data, Encoder encoder)
+    public void serializeFastSerdeLogicalTypesTest10(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object unionOfArrayAndMap0 = ((Object) data.get(0));
@@ -79,6 +80,7 @@ public void serializeFastSerdeLogicalTypesTest10(IndexedRecord data, Encoder enc
         } else {
             if (unionOfArrayAndMap0 instanceof Map) {
                 (encoder).writeIndex(1);
+                (customization).getCheckMapTypeFunction().apply(((Map<CharSequence, LocalDate> ) unionOfArrayAndMap0));
                 (encoder).writeMapStart();
                 if ((((Map<CharSequence, LocalDate> ) unionOfArrayAndMap0) == null)||((Map<CharSequence, LocalDate> ) unionOfArrayAndMap0).isEmpty()) {
                     (encoder).setItemCount(0);
@@ -95,19 +97,20 @@ public void serializeFastSerdeLogicalTypesTest10(IndexedRecord data, Encoder enc
                 (encoder).writeMapEnd();
             }
         }
-        serialize_FastSerdeLogicalTypesTest10(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest11(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest12(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest13(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest14(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest15(data, (encoder));
+        serialize_FastSerdeLogicalTypesTest10(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest11(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest12(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest13(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest14(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest15(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest10(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest10(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Map<CharSequence, Object> mapOfUnionsOfDateAndTimestampMillis0 = ((Map<CharSequence, Object> ) data.get(1));
+        (customization).getCheckMapTypeFunction().apply(mapOfUnionsOfDateAndTimestampMillis0);
         (encoder).writeMapStart();
         if ((mapOfUnionsOfDateAndTimestampMillis0 == null)||mapOfUnionsOfDateAndTimestampMillis0 .isEmpty()) {
             (encoder).setItemCount(0);
@@ -135,6 +138,7 @@ private void serialize_FastSerdeLogicalTypesTest10(IndexedRecord data, Encoder e
         }
         (encoder).writeMapEnd();
         Map<CharSequence, Instant> timestampMillisMap0 = ((Map<CharSequence, Instant> ) data.get(2));
+        (customization).getCheckMapTypeFunction().apply(timestampMillisMap0);
         (encoder).writeMapStart();
         if ((timestampMillisMap0 == null)||timestampMillisMap0 .isEmpty()) {
             (encoder).setItemCount(0);
@@ -152,7 +156,7 @@ private void serialize_FastSerdeLogicalTypesTest10(IndexedRecord data, Encoder e
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest11(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest11(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<LocalDate> nullableArrayOfDates0 = ((List<LocalDate> ) data.get(3));
@@ -216,7 +220,7 @@ private void serialize_FastSerdeLogicalTypesTest11(IndexedRecord data, Encoder e
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest12(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest12(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object unionOfDecimalOrDate0 = ((Object) data.get(5));
@@ -243,7 +247,7 @@ private void serialize_FastSerdeLogicalTypesTest12(IndexedRecord data, Encoder e
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest13(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest13(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue13 = data.get(7);
@@ -255,7 +259,7 @@ private void serialize_FastSerdeLogicalTypesTest13(IndexedRecord data, Encoder e
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest14(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest14(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue15 = data.get(9);
@@ -267,29 +271,29 @@ private void serialize_FastSerdeLogicalTypesTest14(IndexedRecord data, Encoder e
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest15(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest15(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue17 = data.get(11);
         convertedValue17 = Conversions.convertToRawType(convertedValue17, this.logicalTypeSchema__59052268, this.logicalTypeSchema__59052268 .getLogicalType(), this.conversion_date);
         (encoder).writeInt(((Integer) convertedValue17));
         IndexedRecord nestedLocalTimestampMillis0 = ((IndexedRecord) data.get(12));
-        serializeLocalTimestampRecord0(nestedLocalTimestampMillis0, (encoder));
+        serializeLocalTimestampRecord0(nestedLocalTimestampMillis0, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeLocalTimestampRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeLocalTimestampRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue18 = data.get(0);
         convertedValue18 = Conversions.convertToRawType(convertedValue18, this.logicalTypeSchema__250645780, this.logicalTypeSchema__250645780 .getLogicalType(), this.conversion_local_timestamp_millis);
         (encoder).writeLong(((Long) convertedValue18));
-        serialize_LocalTimestampRecord0(data, (encoder));
-        serialize_LocalTimestampRecord1(data, (encoder));
+        serialize_LocalTimestampRecord0(data, (encoder), (customization));
+        serialize_LocalTimestampRecord1(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_LocalTimestampRecord0(IndexedRecord data, Encoder encoder)
+    private void serialize_LocalTimestampRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         LocalDateTime nullableNestedTimestamp0 = ((LocalDateTime) data.get(1));
@@ -324,7 +328,7 @@ private void serialize_LocalTimestampRecord0(IndexedRecord data, Encoder encoder
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_LocalTimestampRecord1(IndexedRecord data, Encoder encoder)
+    private void serialize_LocalTimestampRecord1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object unionOfDateAndLocalTimestamp0 = ((Object) data.get(3));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesTest1_SpecificSerializer_1007574890.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesTest1_SpecificSerializer_1007574890.java
index 3b701c99a..668bdc1a9 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesTest1_SpecificSerializer_1007574890.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesTest1_SpecificSerializer_1007574890.java
@@ -12,6 +12,7 @@
 import java.util.Map;
 import com.linkedin.avro.api.PrimitiveIntList;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesTest1;
 import com.linkedin.avro.fastserde.generated.avro.LocalTimestampRecord;
 import org.apache.avro.Conversions;
@@ -40,14 +41,14 @@ public class FastSerdeLogicalTypesTest1_SpecificSerializer_1007574890
     private final Schema logicalTypeSchema__1515894331 = Schema.parse("{\"type\":\"long\",\"logicalType\":\"time-micros\"}");
     private final Schema logicalTypeSchema__250645780 = Schema.parse("{\"type\":\"long\",\"logicalType\":\"local-timestamp-millis\"}");
 
-    public void serialize(FastSerdeLogicalTypesTest1 data, Encoder encoder)
+    public void serialize(FastSerdeLogicalTypesTest1 data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastSerdeLogicalTypesTest10(data, (encoder));
+        serializeFastSerdeLogicalTypesTest10(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastSerdeLogicalTypesTest10(FastSerdeLogicalTypesTest1 data, Encoder encoder)
+    public void serializeFastSerdeLogicalTypesTest10(FastSerdeLogicalTypesTest1 data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object unionOfArrayAndMap0 = ((Object) data.get(0));
@@ -80,6 +81,7 @@ public void serializeFastSerdeLogicalTypesTest10(FastSerdeLogicalTypesTest1 data
         } else {
             if (unionOfArrayAndMap0 instanceof Map) {
                 (encoder).writeIndex(1);
+                (customization).getCheckMapTypeFunction().apply(((Map<CharSequence, LocalDate> ) unionOfArrayAndMap0));
                 (encoder).writeMapStart();
                 if ((((Map<CharSequence, LocalDate> ) unionOfArrayAndMap0) == null)||((Map<CharSequence, LocalDate> ) unionOfArrayAndMap0).isEmpty()) {
                     (encoder).setItemCount(0);
@@ -96,19 +98,20 @@ public void serializeFastSerdeLogicalTypesTest10(FastSerdeLogicalTypesTest1 data
                 (encoder).writeMapEnd();
             }
         }
-        serialize_FastSerdeLogicalTypesTest10(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest11(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest12(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest13(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest14(data, (encoder));
-        serialize_FastSerdeLogicalTypesTest15(data, (encoder));
+        serialize_FastSerdeLogicalTypesTest10(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest11(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest12(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest13(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest14(data, (encoder), (customization));
+        serialize_FastSerdeLogicalTypesTest15(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest10(FastSerdeLogicalTypesTest1 data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest10(FastSerdeLogicalTypesTest1 data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Map<CharSequence, Object> mapOfUnionsOfDateAndTimestampMillis0 = ((Map<CharSequence, Object> ) data.get(1));
+        (customization).getCheckMapTypeFunction().apply(mapOfUnionsOfDateAndTimestampMillis0);
         (encoder).writeMapStart();
         if ((mapOfUnionsOfDateAndTimestampMillis0 == null)||mapOfUnionsOfDateAndTimestampMillis0 .isEmpty()) {
             (encoder).setItemCount(0);
@@ -136,6 +139,7 @@ private void serialize_FastSerdeLogicalTypesTest10(FastSerdeLogicalTypesTest1 da
         }
         (encoder).writeMapEnd();
         Map<CharSequence, Instant> timestampMillisMap0 = ((Map<CharSequence, Instant> ) data.get(2));
+        (customization).getCheckMapTypeFunction().apply(timestampMillisMap0);
         (encoder).writeMapStart();
         if ((timestampMillisMap0 == null)||timestampMillisMap0 .isEmpty()) {
             (encoder).setItemCount(0);
@@ -153,7 +157,7 @@ private void serialize_FastSerdeLogicalTypesTest10(FastSerdeLogicalTypesTest1 da
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest11(FastSerdeLogicalTypesTest1 data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest11(FastSerdeLogicalTypesTest1 data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<LocalDate> nullableArrayOfDates0 = ((List<LocalDate> ) data.get(3));
@@ -217,7 +221,7 @@ private void serialize_FastSerdeLogicalTypesTest11(FastSerdeLogicalTypesTest1 da
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest12(FastSerdeLogicalTypesTest1 data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest12(FastSerdeLogicalTypesTest1 data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object unionOfDecimalOrDate0 = ((Object) data.get(5));
@@ -244,7 +248,7 @@ private void serialize_FastSerdeLogicalTypesTest12(FastSerdeLogicalTypesTest1 da
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest13(FastSerdeLogicalTypesTest1 data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest13(FastSerdeLogicalTypesTest1 data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue13 = data.get(7);
@@ -256,7 +260,7 @@ private void serialize_FastSerdeLogicalTypesTest13(FastSerdeLogicalTypesTest1 da
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest14(FastSerdeLogicalTypesTest1 data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest14(FastSerdeLogicalTypesTest1 data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue15 = data.get(9);
@@ -268,29 +272,29 @@ private void serialize_FastSerdeLogicalTypesTest14(FastSerdeLogicalTypesTest1 da
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesTest15(FastSerdeLogicalTypesTest1 data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesTest15(FastSerdeLogicalTypesTest1 data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue17 = data.get(11);
         convertedValue17 = Conversions.convertToRawType(convertedValue17, this.logicalTypeSchema__59052268, this.logicalTypeSchema__59052268 .getLogicalType(), this.conversion_date);
         (encoder).writeInt(((Integer) convertedValue17));
         LocalTimestampRecord nestedLocalTimestampMillis0 = ((LocalTimestampRecord) data.get(12));
-        serializeLocalTimestampRecord0(nestedLocalTimestampMillis0, (encoder));
+        serializeLocalTimestampRecord0(nestedLocalTimestampMillis0, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeLocalTimestampRecord0(LocalTimestampRecord data, Encoder encoder)
+    public void serializeLocalTimestampRecord0(LocalTimestampRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object convertedValue18 = data.get(0);
         convertedValue18 = Conversions.convertToRawType(convertedValue18, this.logicalTypeSchema__250645780, this.logicalTypeSchema__250645780 .getLogicalType(), this.conversion_local_timestamp_millis);
         (encoder).writeLong(((Long) convertedValue18));
-        serialize_LocalTimestampRecord0(data, (encoder));
-        serialize_LocalTimestampRecord1(data, (encoder));
+        serialize_LocalTimestampRecord0(data, (encoder), (customization));
+        serialize_LocalTimestampRecord1(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_LocalTimestampRecord0(LocalTimestampRecord data, Encoder encoder)
+    private void serialize_LocalTimestampRecord0(LocalTimestampRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         LocalDateTime nullableNestedTimestamp0 = ((LocalDateTime) data.get(1));
@@ -325,7 +329,7 @@ private void serialize_LocalTimestampRecord0(LocalTimestampRecord data, Encoder
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_LocalTimestampRecord1(LocalTimestampRecord data, Encoder encoder)
+    private void serialize_LocalTimestampRecord1(LocalTimestampRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object unionOfDateAndLocalTimestamp0 = ((Object) data.get(3));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_GenericSerializer_1982763418.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_GenericSerializer_1982763418.java
index e78fac629..66d51e270 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_GenericSerializer_1982763418.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_GenericSerializer_1982763418.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 
@@ -12,22 +13,22 @@ public class FastSerdeLogicalTypesUndefined_GenericSerializer_1982763418
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastSerdeLogicalTypesUndefined0(data, (encoder));
+        serializeFastSerdeLogicalTypesUndefined0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastSerdeLogicalTypesUndefined0(IndexedRecord data, Encoder encoder)
+    public void serializeFastSerdeLogicalTypesUndefined0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(0)));
-        serialize_FastSerdeLogicalTypesUndefined0(data, (encoder));
+        serialize_FastSerdeLogicalTypesUndefined0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesUndefined0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesUndefined0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(1)));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_SpecificSerializer_1982763418.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_SpecificSerializer_1982763418.java
index e4a31721e..fbbc19764 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_SpecificSerializer_1982763418.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastSerdeLogicalTypesUndefined_SpecificSerializer_1982763418.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.List;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import com.linkedin.avro.fastserde.generated.avro.FastSerdeLogicalTypesUndefined;
 import org.apache.avro.io.Encoder;
 
@@ -12,22 +13,22 @@ public class FastSerdeLogicalTypesUndefined_SpecificSerializer_1982763418
 {
 
 
-    public void serialize(FastSerdeLogicalTypesUndefined data, Encoder encoder)
+    public void serialize(FastSerdeLogicalTypesUndefined data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastSerdeLogicalTypesUndefined0(data, (encoder));
+        serializeFastSerdeLogicalTypesUndefined0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastSerdeLogicalTypesUndefined0(FastSerdeLogicalTypesUndefined data, Encoder encoder)
+    public void serializeFastSerdeLogicalTypesUndefined0(FastSerdeLogicalTypesUndefined data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(0)));
-        serialize_FastSerdeLogicalTypesUndefined0(data, (encoder));
+        serialize_FastSerdeLogicalTypesUndefined0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastSerdeLogicalTypesUndefined0(FastSerdeLogicalTypesUndefined data, Encoder encoder)
+    private void serialize_FastSerdeLogicalTypesUndefined0(FastSerdeLogicalTypesUndefined data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeInt(((Integer) data.get(1)));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericSerializer_205569.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericSerializer_205569.java
index ec3e8bbaa..ceea04b63 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericSerializer_205569.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericSerializer_205569.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -14,14 +15,14 @@ public class FastStringableTest_javaStringPropertyInReaderSchemaTest_GenericSeri
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(data, (encoder));
+        serializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(IndexedRecord data, Encoder encoder)
+    public void serializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         if (((CharSequence) data.get(0)) instanceof Utf8) {
@@ -29,12 +30,12 @@ public void serializeFastStringableTest_javaStringPropertyInReaderSchemaTest0(In
         } else {
             (encoder).writeString(((CharSequence) data.get(0)).toString());
         }
-        serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest0(data, (encoder));
-        serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest1(data, (encoder));
+        serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest0(data, (encoder), (customization));
+        serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest1(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence testUnionString0 = ((CharSequence) data.get(1));
@@ -68,10 +69,11 @@ private void serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest0(
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest1(IndexedRecord data, Encoder encoder)
+    private void serialize_FastStringableTest_javaStringPropertyInReaderSchemaTest1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Map<CharSequence, CharSequence> testStringMap0 = ((Map<CharSequence, CharSequence> ) data.get(3));
+        (customization).getCheckMapTypeFunction().apply(testStringMap0);
         (encoder).writeMapStart();
         if ((testStringMap0 == null)||testStringMap0 .isEmpty()) {
             (encoder).setItemCount(0);
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastStringableTest_javaStringPropertyTest_GenericSerializer_1110978985.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastStringableTest_javaStringPropertyTest_GenericSerializer_1110978985.java
index 475045cf9..89ccbf286 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastStringableTest_javaStringPropertyTest_GenericSerializer_1110978985.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/FastStringableTest_javaStringPropertyTest_GenericSerializer_1110978985.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -14,14 +15,14 @@ public class FastStringableTest_javaStringPropertyTest_GenericSerializer_1110978
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeFastStringableTest_javaStringPropertyTest0(data, (encoder));
+        serializeFastStringableTest_javaStringPropertyTest0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeFastStringableTest_javaStringPropertyTest0(IndexedRecord data, Encoder encoder)
+    public void serializeFastStringableTest_javaStringPropertyTest0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         if (((CharSequence) data.get(0)) instanceof Utf8) {
@@ -29,12 +30,12 @@ public void serializeFastStringableTest_javaStringPropertyTest0(IndexedRecord da
         } else {
             (encoder).writeString(((CharSequence) data.get(0)).toString());
         }
-        serialize_FastStringableTest_javaStringPropertyTest0(data, (encoder));
-        serialize_FastStringableTest_javaStringPropertyTest1(data, (encoder));
+        serialize_FastStringableTest_javaStringPropertyTest0(data, (encoder), (customization));
+        serialize_FastStringableTest_javaStringPropertyTest1(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastStringableTest_javaStringPropertyTest0(IndexedRecord data, Encoder encoder)
+    private void serialize_FastStringableTest_javaStringPropertyTest0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence testUnionString0 = ((CharSequence) data.get(1));
@@ -68,10 +69,11 @@ private void serialize_FastStringableTest_javaStringPropertyTest0(IndexedRecord
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_FastStringableTest_javaStringPropertyTest1(IndexedRecord data, Encoder encoder)
+    private void serialize_FastStringableTest_javaStringPropertyTest1(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Map<CharSequence, CharSequence> testStringMap0 = ((Map<CharSequence, CharSequence> ) data.get(3));
+        (customization).getCheckMapTypeFunction().apply(testStringMap0);
         (encoder).writeMapStart();
         if ((testStringMap0 == null)||testStringMap0 .isEmpty()) {
             (encoder).setItemCount(0);
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Map_of_UNION_GenericSerializer_2140000109.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Map_of_UNION_GenericSerializer_2140000109.java
index 9aeca0f8a..75972c437 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Map_of_UNION_GenericSerializer_2140000109.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Map_of_UNION_GenericSerializer_2140000109.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -13,9 +14,10 @@ public class Map_of_UNION_GenericSerializer_2140000109
 {
 
 
-    public void serialize(Map<CharSequence, IndexedRecord> data, Encoder encoder)
+    public void serialize(Map<CharSequence, IndexedRecord> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
+        (customization).getCheckMapTypeFunction().apply(data);
         (encoder).writeMapStart();
         if ((data == null)||data.isEmpty()) {
             (encoder).setItemCount(0);
@@ -32,7 +34,7 @@ public void serialize(Map<CharSequence, IndexedRecord> data, Encoder encoder)
                 } else {
                     if ((union0 instanceof IndexedRecord)&&"com.linkedin.avro.fastserde.generated.avro.record".equals(((IndexedRecord) union0).getSchema().getFullName())) {
                         (encoder).writeIndex(1);
-                        serializeRecord0(((IndexedRecord) union0), (encoder));
+                        serializeRecord0(((IndexedRecord) union0), (encoder), (customization));
                     }
                 }
             }
@@ -41,7 +43,7 @@ public void serialize(Map<CharSequence, IndexedRecord> data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence field0 = ((CharSequence) data.get(0));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Map_of_record_GenericSerializer_1677529043.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Map_of_record_GenericSerializer_1677529043.java
index 6b4925efc..bf887751c 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Map_of_record_GenericSerializer_1677529043.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/Map_of_record_GenericSerializer_1677529043.java
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 import org.apache.avro.util.Utf8;
@@ -13,9 +14,10 @@ public class Map_of_record_GenericSerializer_1677529043
 {
 
 
-    public void serialize(Map<CharSequence, IndexedRecord> data, Encoder encoder)
+    public void serialize(Map<CharSequence, IndexedRecord> data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
+        (customization).getCheckMapTypeFunction().apply(data);
         (encoder).writeMapStart();
         if ((data == null)||data.isEmpty()) {
             (encoder).setItemCount(0);
@@ -26,14 +28,14 @@ public void serialize(Map<CharSequence, IndexedRecord> data, Encoder encoder)
                 (encoder).writeString(key0);
                 IndexedRecord record0 = null;
                 record0 = ((Map<CharSequence, IndexedRecord> ) data).get(key0);
-                serializeRecord0(record0, (encoder));
+                serializeRecord0(record0, (encoder), (customization));
             }
         }
         (encoder).writeMapEnd();
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeRecord0(IndexedRecord data, Encoder encoder)
+    public void serializeRecord0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         CharSequence field0 = ((CharSequence) data.get(0));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/StringableRecord_SpecificSerializer_842267318.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/StringableRecord_SpecificSerializer_842267318.java
index af5c14728..5fc7d595d 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/StringableRecord_SpecificSerializer_842267318.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/StringableRecord_SpecificSerializer_842267318.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import java.util.Map;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import com.linkedin.avro.fastserde.generated.avro.AnotherSubRecord;
 import com.linkedin.avro.fastserde.generated.avro.StringableRecord;
 import com.linkedin.avro.fastserde.generated.avro.StringableSubRecord;
@@ -21,26 +22,26 @@ public class StringableRecord_SpecificSerializer_842267318
 {
 
 
-    public void serialize(StringableRecord data, Encoder encoder)
+    public void serialize(StringableRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeStringableRecord0(data, (encoder));
+        serializeStringableRecord0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeStringableRecord0(StringableRecord data, Encoder encoder)
+    public void serializeStringableRecord0(StringableRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeString(((BigInteger) data.get(0)).toString());
-        serialize_StringableRecord0(data, (encoder));
-        serialize_StringableRecord1(data, (encoder));
-        serialize_StringableRecord2(data, (encoder));
-        serialize_StringableRecord3(data, (encoder));
-        serialize_StringableRecord4(data, (encoder));
+        serialize_StringableRecord0(data, (encoder), (customization));
+        serialize_StringableRecord1(data, (encoder), (customization));
+        serialize_StringableRecord2(data, (encoder), (customization));
+        serialize_StringableRecord3(data, (encoder), (customization));
+        serialize_StringableRecord4(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_StringableRecord0(StringableRecord data, Encoder encoder)
+    private void serialize_StringableRecord0(StringableRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeString(((BigDecimal) data.get(1)).toString());
@@ -48,7 +49,7 @@ private void serialize_StringableRecord0(StringableRecord data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_StringableRecord1(StringableRecord data, Encoder encoder)
+    private void serialize_StringableRecord1(StringableRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeString(((URL) data.get(3)).toString());
@@ -56,7 +57,7 @@ private void serialize_StringableRecord1(StringableRecord data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_StringableRecord2(StringableRecord data, Encoder encoder)
+    private void serialize_StringableRecord2(StringableRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<URL> urlArray0 = ((List<URL> ) data.get(5));
@@ -72,6 +73,7 @@ private void serialize_StringableRecord2(StringableRecord data, Encoder encoder)
         }
         (encoder).writeArrayEnd();
         Map<URL, BigInteger> urlMap0 = ((Map<URL, BigInteger> ) data.get(6));
+        (customization).getCheckMapTypeFunction().apply(urlMap0);
         (encoder).writeMapStart();
         if ((urlMap0 == null)||urlMap0 .isEmpty()) {
             (encoder).setItemCount(0);
@@ -88,25 +90,25 @@ private void serialize_StringableRecord2(StringableRecord data, Encoder encoder)
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_StringableRecord3(StringableRecord data, Encoder encoder)
+    private void serialize_StringableRecord3(StringableRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         StringableSubRecord subRecord0 = ((StringableSubRecord) data.get(7));
-        serializeStringableSubRecord0(subRecord0, (encoder));
+        serializeStringableSubRecord0(subRecord0, (encoder), (customization));
         AnotherSubRecord subRecordWithSubRecord0 = ((AnotherSubRecord) data.get(8));
-        serializeAnotherSubRecord0(subRecordWithSubRecord0, (encoder));
+        serializeAnotherSubRecord0(subRecordWithSubRecord0, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeStringableSubRecord0(StringableSubRecord data, Encoder encoder)
+    public void serializeStringableSubRecord0(StringableSubRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         (encoder).writeString(((URI) data.get(0)).toString());
-        serialize_StringableSubRecord0(data, (encoder));
+        serialize_StringableSubRecord0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_StringableSubRecord0(StringableSubRecord data, Encoder encoder)
+    private void serialize_StringableSubRecord0(StringableSubRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         Object nullStringIntUnion0 = ((Object) data.get(1));
@@ -131,15 +133,15 @@ private void serialize_StringableSubRecord0(StringableSubRecord data, Encoder en
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeAnotherSubRecord0(AnotherSubRecord data, Encoder encoder)
+    public void serializeAnotherSubRecord0(AnotherSubRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         StringableSubRecord subRecord1 = ((StringableSubRecord) data.get(0));
-        serializeStringableSubRecord0(subRecord1, (encoder));
+        serializeStringableSubRecord0(subRecord1, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    private void serialize_StringableRecord4(StringableRecord data, Encoder encoder)
+    private void serialize_StringableRecord4(StringableRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         String stringUnion0 = ((String) data.get(9));
diff --git a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/TestArrayOfFloats_GenericSerializer_1408566797.java b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/TestArrayOfFloats_GenericSerializer_1408566797.java
index 90b8bcd9d..1d7552274 100644
--- a/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/TestArrayOfFloats_GenericSerializer_1408566797.java
+++ b/fastserde/avro-fastserde-tests111/build/codegen/java/com/linkedin/avro/fastserde/generated/serialization/AVRO_1_11/TestArrayOfFloats_GenericSerializer_1408566797.java
@@ -6,6 +6,7 @@
 import com.linkedin.avro.api.PrimitiveFloatList;
 import com.linkedin.avro.fastserde.BufferBackedPrimitiveFloatList;
 import com.linkedin.avro.fastserde.FastSerializer;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.generic.IndexedRecord;
 import org.apache.avro.io.Encoder;
 
@@ -14,14 +15,14 @@ public class TestArrayOfFloats_GenericSerializer_1408566797
 {
 
 
-    public void serialize(IndexedRecord data, Encoder encoder)
+    public void serialize(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
-        serializeTestArrayOfFloats0(data, (encoder));
+        serializeTestArrayOfFloats0(data, (encoder), (customization));
     }
 
     @SuppressWarnings("unchecked")
-    public void serializeTestArrayOfFloats0(IndexedRecord data, Encoder encoder)
+    public void serializeTestArrayOfFloats0(IndexedRecord data, Encoder encoder, DatumWriterCustomization customization)
         throws IOException
     {
         List<Float> array_of_float0 = ((List<Float> ) data.get(0));
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastClassStatus.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastClassStatus.java
new file mode 100644
index 000000000..164b04aef
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastClassStatus.java
@@ -0,0 +1,27 @@
+package com.linkedin.avro.fastserde;
+
+public interface FastClassStatus {
+  /**
+   * Whether it is implemented by the runtime-generated class or not.
+   */
+  default boolean isBackedByGeneratedClass() {
+    return true;
+  }
+
+  /**
+   * Tell the user, specifically {@link FastGenericDatumReader}/{@link FastSpecificDatumReader} or
+   * {@link FastGenericDatumWriter}/{@link FastSpecificDatumWriter} that
+   * whether runtime class generation is done or not.
+   * There will be two outcomes:
+   * 1. Fast class is backed by the class generated at runtime.
+   * 2. Vanilla Avro based implementation when runtime class generation fails.
+   *
+   * For both cases, {@link FastGenericDatumReader}/{@link FastSpecificDatumReader} or
+   * {@link FastGenericDatumWriter}/{@link FastSpecificDatumWriter}can stop polling
+   * the runtime class generation status.
+   */
+  default boolean hasDynamicClassGenerationDone() {
+    return true;
+  }
+
+}
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastDeserializer.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastDeserializer.java
index 3e918c803..3d06bee27 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastDeserializer.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastDeserializer.java
@@ -1,14 +1,23 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
 import org.apache.avro.io.Decoder;
 
+import static com.linkedin.avro.fastserde.customized.DatumReaderCustomization.*;
 
-public interface FastDeserializer<T> {
+
+public interface FastDeserializer<T> extends FastClassStatus {
 
   default T deserialize(Decoder d) throws IOException {
     return deserialize(null, d);
   }
 
-  T deserialize(T reuse, Decoder d) throws IOException;
+  default T deserialize(T reuse, Decoder d) throws IOException {
+    return deserialize(reuse, d, DEFAULT_DATUM_READER_CUSTOMIZATION);
+  }
+
+  T deserialize(T reuse, Decoder d, DatumReaderCustomization customization) throws IOException;
 }
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastDeserializerGenerator.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastDeserializerGenerator.java
index 03fed9a8f..8d2085974 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastDeserializerGenerator.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastDeserializerGenerator.java
@@ -3,6 +3,7 @@
 import com.linkedin.avro.api.PrimitiveFloatList;
 import com.linkedin.avro.fastserde.backport.ResolvingGrammarGenerator;
 import com.linkedin.avro.fastserde.backport.Symbol;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import com.linkedin.avroutil1.compatibility.AvroCompatibilityHelper;
 import com.linkedin.avroutil1.compatibility.AvroVersion;
 import com.sun.codemodel.JArray;
@@ -38,6 +39,8 @@
 import java.util.Map;
 import java.util.Set;
 import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
@@ -60,6 +63,8 @@ public class FastDeserializerGenerator<T, U extends GenericData> extends FastDes
 
   private static final String DECODER = "decoder";
   private static final String VAR_NAME_FOR_REUSE = "reuse";
+  private static final String VAR_NAME_FOR_CUSTOMIZATION = "customization";
+
   private static int FIELDS_PER_POPULATION_METHOD = 20;
 
   // 65535 is the actual limit, 65K added for safety
@@ -123,22 +128,23 @@ public FastDeserializer<T> generateDeserializer() {
       JBlock topLevelDeserializeBlock = new JBlock();
 
       final Supplier<JExpression> reuseSupplier = () -> JExpr.direct(VAR_NAME_FOR_REUSE);
+      final Supplier<JExpression> customizationSupplier = () -> JExpr.direct(VAR_NAME_FOR_CUSTOMIZATION);
       switch (aliasedWriterSchema.getType()) {
         case RECORD:
           processRecord(readerSchemaVar, aliasedWriterSchema.getName(), aliasedWriterSchema, reader,
-              topLevelDeserializeBlock, fieldAction, JBlock::_return, reuseSupplier);
+              topLevelDeserializeBlock, fieldAction, JBlock::_return, reuseSupplier, customizationSupplier);
           break;
         case ARRAY:
           processArray(readerSchemaVar, "array", aliasedWriterSchema, reader, topLevelDeserializeBlock, fieldAction,
-              JBlock::_return, reuseSupplier);
+              JBlock::_return, reuseSupplier, customizationSupplier);
           break;
         case MAP:
           processMap(readerSchemaVar, "map", aliasedWriterSchema, reader, topLevelDeserializeBlock, fieldAction,
-              JBlock::_return, reuseSupplier);
+              JBlock::_return, reuseSupplier, customizationSupplier);
           break;
         case UNION:
           processUnion(readerSchemaVar, "union", aliasedWriterSchema, reader, topLevelDeserializeBlock, fieldAction,
-                  JBlock::_return, reuseSupplier);
+                  JBlock::_return, reuseSupplier, customizationSupplier);
           break;
         default:
           throw new FastDeserializerGeneratorException(
@@ -161,6 +167,7 @@ public FastDeserializer<T> generateDeserializer() {
       deserializeMethod._throws(codeModel.ref(IOException.class));
       deserializeMethod.param(readerSchemaClass, VAR_NAME_FOR_REUSE);
       deserializeMethod.param(Decoder.class, DECODER);
+      deserializeMethod.param(DatumReaderCustomization.class, VAR_NAME_FOR_CUSTOMIZATION);
 
       @SuppressWarnings("unchecked")
       Class<FastDeserializer<T>> clazz = compileClass(className, schemaAssistant.getUsedFullyQualifiedClassNameSet());
@@ -177,23 +184,23 @@ public FastDeserializer<T> generateDeserializer() {
 
   private void processComplexType(JVar fieldSchemaVar, String name, Schema schema, Schema readerFieldSchema,
       JBlock methodBody, FieldAction action, BiConsumer<JBlock, JExpression> putExpressionIntoParent,
-      Supplier<JExpression> reuseSupplier) {
+      Supplier<JExpression> reuseSupplier, Supplier<JExpression> customizationSupplier) {
     switch (schema.getType()) {
       case RECORD:
         processRecord(fieldSchemaVar, schema.getName(), schema, readerFieldSchema, methodBody, action,
-            putExpressionIntoParent, reuseSupplier);
+            putExpressionIntoParent, reuseSupplier, customizationSupplier);
         break;
       case ARRAY:
         processArray(fieldSchemaVar, name, schema, readerFieldSchema, methodBody, action, putExpressionIntoParent,
-            reuseSupplier);
+            reuseSupplier, customizationSupplier);
         break;
       case MAP:
         processMap(fieldSchemaVar, name, schema, readerFieldSchema, methodBody, action, putExpressionIntoParent,
-            reuseSupplier);
+            reuseSupplier, customizationSupplier);
         break;
       case UNION:
         processUnion(fieldSchemaVar, name, schema, readerFieldSchema, methodBody, action, putExpressionIntoParent,
-            reuseSupplier);
+            reuseSupplier, customizationSupplier);
         break;
       default:
         throw new FastDeserializerGeneratorException("Incorrect complex type: " + action.getType());
@@ -222,7 +229,8 @@ private void processSimpleType(Schema schema, Schema readerSchema, JBlock method
 
   private void processRecord(JVar recordSchemaVar, String recordName, final Schema recordWriterSchema,
       final Schema recordReaderSchema, JBlock parentBody, FieldAction recordAction,
-      BiConsumer<JBlock, JExpression> putRecordIntoParent, Supplier<JExpression> reuseSupplier) {
+      BiConsumer<JBlock, JExpression> putRecordIntoParent, Supplier<JExpression> reuseSupplier,
+      Supplier<JExpression> customizationSupplier) {
 
     Schema effectiveRecordReaderSchema = recordReaderSchema;
     if (recordAction.getShouldRead()) {
@@ -258,7 +266,8 @@ private void processRecord(JVar recordSchemaVar, String recordName, final Schema
     if (methodAlreadyDefined(recordWriterSchema, effectiveRecordReaderSchema, recordAction.getShouldRead())) {
       JMethod method = getMethod(recordWriterSchema, effectiveRecordReaderSchema, recordAction.getShouldRead());
       updateActualExceptions(method);
-      JExpression readingExpression = JExpr.invoke(method).arg(reuseSupplier.get()).arg(JExpr.direct(DECODER));
+      JExpression readingExpression = JExpr.invoke(method).arg(reuseSupplier.get()).arg(JExpr.direct(DECODER)).arg(
+          customizationSupplier.get());
       if (recordAction.getShouldRead()) {
         putRecordIntoParent.accept(parentBody, readingExpression);
       } else {
@@ -293,9 +302,9 @@ private void processRecord(JVar recordSchemaVar, String recordName, final Schema
     schemaAssistant.resetExceptionsFromStringable();
 
     if (recordAction.getShouldRead()) {
-      putRecordIntoParent.accept(parentBody, JExpr.invoke(method).arg(reuseSupplier.get()).arg(JExpr.direct(DECODER)));
+      putRecordIntoParent.accept(parentBody, JExpr.invoke(method).arg(reuseSupplier.get()).arg(JExpr.direct(DECODER)).arg(customizationSupplier.get()));
     } else {
-      parentBody.invoke(method).arg(reuseSupplier.get()).arg(JExpr.direct(DECODER));
+      parentBody.invoke(method).arg(reuseSupplier.get()).arg(JExpr.direct(DECODER)).arg(customizationSupplier.get());
     }
 
     JBlock methodBody = method.body();
@@ -351,6 +360,7 @@ private void processRecord(JVar recordSchemaVar, String recordName, final Schema
         popMethod._throws(IOException.class);
         if (recordAction.getShouldRead()) {
           popMethod.param(recordClass, recordName);
+          popMethod.param(codeModel.ref(DatumReaderCustomization.class), VAR_NAME_FOR_CUSTOMIZATION);
         }
         popMethod.param(Decoder.class, DECODER);
         popMethodBody = popMethod.body();
@@ -358,6 +368,7 @@ private void processRecord(JVar recordSchemaVar, String recordName, final Schema
         JInvocation invocation = methodBody.invoke(popMethod);
         if (recordAction.getShouldRead()) {
           invocation.arg(JExpr.direct(recordName));
+          invocation.arg(customizationSupplier.get());
         }
         invocation.arg(JExpr.direct(DECODER));
       }
@@ -384,7 +395,7 @@ private void processRecord(JVar recordSchemaVar, String recordName, final Schema
       }
       if (SchemaAssistant.isComplexType(field.schema())) {
         processComplexType(fieldSchemaVar, field.name(), field.schema(), readerFieldSchema, popMethodBody, action,
-            putExpressionInRecord, fieldReuseSupplier);
+            putExpressionInRecord, fieldReuseSupplier, customizationSupplier);
       } else {
         processSimpleType(field.schema(), readerFieldSchema, popMethodBody, action, putExpressionInRecord, fieldReuseSupplier);
       }
@@ -591,7 +602,8 @@ private JExpression parseDefaultValue(Schema schema, Object defaultValue, JBlock
 
   private void processUnion(JVar unionSchemaVar, final String name, final Schema unionSchema,
       final Schema unionReaderSchema, JBlock body, FieldAction action,
-      BiConsumer<JBlock, JExpression> putValueIntoParent, Supplier<JExpression> reuseSupplier) {
+      BiConsumer<JBlock, JExpression> putValueIntoParent, Supplier<JExpression> reuseSupplier,
+      Supplier<JExpression> customizationSupplier) {
     JVar unionIndex = body.decl(codeModel.INT, getUniqueName("unionIndex"), JExpr.direct(DECODER + ".readIndex()"));
     JConditional ifBlock = null;
 
@@ -697,7 +709,7 @@ private void processUnion(JVar unionSchemaVar, final String name, final Schema u
           throw new FastDeserializerGeneratorException("Union cannot be sub-type of union!");
         }
         processComplexType(optionSchemaVar, optionName, optionSchema, readerOptionSchema, thenBlock, unionAction,
-            putValueIntoParent, reuseSupplier);
+            putValueIntoParent, reuseSupplier, customizationSupplier);
       } else {
         processSimpleType(optionSchema, readerOptionSchema, thenBlock, unionAction, putValueIntoParent, reuseSupplier);
       }
@@ -709,7 +721,8 @@ private void processUnion(JVar unionSchemaVar, final String name, final Schema u
 
   private void processArray(JVar arraySchemaVar, final String name, final Schema arraySchema,
       final Schema arrayReaderSchema, JBlock parentBody, FieldAction action,
-      BiConsumer<JBlock, JExpression> putArrayIntoParent, Supplier<JExpression> reuseSupplier) {
+      BiConsumer<JBlock, JExpression> putArrayIntoParent, Supplier<JExpression> reuseSupplier,
+      Supplier<JExpression> customizationSupplier) {
 
     Schema effectiveArrayReaderSchema = arrayReaderSchema;
     if (action.getShouldRead()) {
@@ -862,7 +875,7 @@ private void processArray(JVar arraySchemaVar, final String name, final Schema a
       String elemName = name + "Elem";
 
       processComplexType(elementSchemaVar, elemName, arraySchema.getElementType(), readerArrayElementSchema, forBody,
-          finalAction, putValueInArray, elementReuseSupplier);
+          finalAction, putValueInArray, elementReuseSupplier, customizationSupplier);
     } else {
       processSimpleType(arraySchema.getElementType(), readerArrayElementSchema, forBody, finalAction, putValueInArray, elementReuseSupplier);
     }
@@ -895,7 +908,7 @@ private JExpression readStringableExpression(JClass stringbleClass) {
 
   private void processMap(JVar mapSchemaVar, final String name, final Schema mapSchema, final Schema mapReaderSchema,
       JBlock parentBody, FieldAction action, BiConsumer<JBlock, JExpression> putMapIntoParent,
-      Supplier<JExpression> reuseSupplier) {
+      Supplier<JExpression> reuseSupplier, Supplier<JExpression> customizationSupplier) {
 
     /*
      * Determine the action symbol for Map value. {@link ResolvingGrammarGenerator} generates
@@ -961,31 +974,13 @@ private void processMap(JVar mapSchemaVar, final String name, final Schema mapSc
     JBlock ifBlockForChunkLenCheck = conditional._then();
 
     if (action.getShouldRead()) {
-      JVar reuse = declareValueVar(name + "Reuse", effectiveMapReaderSchema, ifBlockForChunkLenCheck);
-
-      // Check whether the reuse is a Map or not
-      final Supplier<JExpression> finalReuseSupplier = potentiallyCacheInvocation(reuseSupplier, ifBlockForChunkLenCheck, "oldMap");
-      ifCodeGen(ifBlockForChunkLenCheck,
-          finalReuseSupplier.get()._instanceof(codeModel.ref(Map.class)),
-          thenBlock -> thenBlock.assign(reuse, JExpr.cast(codeModel.ref(Map.class), finalReuseSupplier.get())));
-
-      // Check whether the reuse is null or not
-      final Schema finalEffectiveMapReaderSchema = effectiveMapReaderSchema;
-      ifCodeGen(ifBlockForChunkLenCheck,
-          reuse.ne(JExpr.direct("null")),
-          thenBlock -> {
-            thenBlock.invoke(reuse, "clear");
-            thenBlock.assign(mapVar, reuse);
-          },
-          // Pure integer arithmetic equivalent of (int) Math.ceil(expectedSize / 0.75).
-          // The default load factor of HashMap is 0.75 and HashMap internally ensures size is always a power of two.
-          elseBlock -> elseBlock.assign(mapVar, JExpr._new(schemaAssistant.classFromSchema(finalEffectiveMapReaderSchema, false))
-              .arg(JExpr.cast(codeModel.INT, chunkLen.mul(JExpr.lit(4)).plus(JExpr.lit(2)).div(JExpr.lit(3)))))
-      );
-
-      JBlock elseBlock = conditional._else();
-      elseBlock.assign(mapVar, JExpr._new(schemaAssistant.classFromSchema(effectiveMapReaderSchema, false))
-          .arg(JExpr.lit(0)));
+      Function<JExpression, Consumer<JBlock>> invokeCustomizedMapFunc =
+          sizeArg -> (block -> block.assign(mapVar,
+              JExpr.cast(codeModel.ref(Map.class),
+                  customizationSupplier.get().invoke("getNewMapOverrideFunc").invoke("apply").arg(reuseSupplier.get()).arg(sizeArg))));
+
+      invokeCustomizedMapFunc.apply(JExpr.cast(codeModel.INT, chunkLen)).accept(ifBlockForChunkLenCheck);
+      invokeCustomizedMapFunc.apply(JExpr.lit(0)).accept(conditional._else());
     }
 
     JDoLoop doLoop = ifBlockForChunkLenCheck._do(chunkLen.gt(JExpr.lit(0)));
@@ -1022,7 +1017,7 @@ private void processMap(JVar mapSchemaVar, final String name, final Schema mapSc
     if (SchemaAssistant.isComplexType(mapSchema.getValueType())) {
       String valueName = name + "Value";
       processComplexType(mapValueSchemaVar, valueName, mapSchema.getValueType(), readerMapValueSchema, forBody, action,
-          putValueInMap, EMPTY_SUPPLIER);
+          putValueInMap, EMPTY_SUPPLIER, customizationSupplier);
     } else {
       processSimpleType(mapSchema.getValueType(), readerMapValueSchema, forBody, action, putValueInMap, EMPTY_SUPPLIER);
     }
@@ -1377,6 +1372,7 @@ private JMethod createMethod(final Schema writerSchema, final Schema readerSchem
     method._throws(IOException.class);
     method.param(Object.class, VAR_NAME_FOR_REUSE);
     method.param(Decoder.class, DECODER);
+    method.param(codeModel.ref(DatumReaderCustomization.class), VAR_NAME_FOR_CUSTOMIZATION);
 
     (read ? deserializeMethodMap : skipMethodMap).put(getEffectiveMethodName(writerSchema, readerSchema), method);
 
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastGenericDatumReader.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastGenericDatumReader.java
index 09b9f6ec3..efe3974ee 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastGenericDatumReader.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastGenericDatumReader.java
@@ -1,5 +1,6 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import java.io.IOException;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.atomic.AtomicReference;
@@ -19,8 +20,11 @@ public class FastGenericDatumReader<T> implements DatumReader<T> {
 
   private Schema writerSchema;
   private Schema readerSchema;
-  private final FastSerdeCache cache;
+  protected final FastSerdeCache cache;
   private final GenericData modelData;
+  private final DatumReaderCustomization customization;
+
+  private final FastDeserializer<T> coldDeserializer;
 
   private final AtomicReference<FastDeserializer<T>> cachedFastDeserializer = new AtomicReference<>();
 
@@ -45,13 +49,19 @@ public FastGenericDatumReader(Schema writerSchema, Schema readerSchema, FastSerd
   }
 
   public FastGenericDatumReader(Schema writerSchema, Schema readerSchema, FastSerdeCache cache, GenericData modelData) {
+    this(writerSchema, readerSchema, cache, modelData, null);
+  }
+
+  public FastGenericDatumReader(Schema writerSchema, Schema readerSchema, FastSerdeCache cache, GenericData modelData, DatumReaderCustomization customization) {
     this.writerSchema = writerSchema;
     this.readerSchema = readerSchema;
     this.cache = cache != null ? cache : FastSerdeCache.getDefaultInstance();
     this.modelData = modelData;
+    this.customization = customization == null ? DatumReaderCustomization.DEFAULT_DATUM_READER_CUSTOMIZATION : customization;
+    this.coldDeserializer = getRegularAvroImpl(writerSchema, readerSchema, modelData, this.customization);
 
     if (!Utils.isSupportedAvroVersionsForDeserializer()) {
-      this.cachedFastDeserializer.set(getRegularAvroImpl(writerSchema, readerSchema, modelData));
+      this.cachedFastDeserializer.set(coldDeserializer);
       if (LOGGER.isDebugEnabled()) {
         LOGGER.debug(
             "Current avro version: " + Utils.getRuntimeAvroVersion() + " is not supported, and only the following"
@@ -60,7 +70,7 @@ public FastGenericDatumReader(Schema writerSchema, Schema readerSchema, FastSerd
       }
     } else if (!FastSerdeCache.isSupportedForFastDeserializer(readerSchema.getType())) {
       // For unsupported schema type, we won't try to fetch it from FastSerdeCache since it is inefficient.
-      this.cachedFastDeserializer.set(getRegularAvroImpl(writerSchema, readerSchema, modelData));
+      this.cachedFastDeserializer.set(coldDeserializer);
       if (LOGGER.isDebugEnabled()) {
         LOGGER.debug("Skip the FastGenericDeserializer generation since read schema type: " + readerSchema.getType()
             + " is not supported");
@@ -86,41 +96,62 @@ public T read(T reuse, Decoder in) throws IOException {
     if (cachedFastDeserializer.get() != null) {
       fastDeserializer = cachedFastDeserializer.get();
     } else {
-      fastDeserializer = getFastDeserializerFromCache(cache, writerSchema, readerSchema, modelData);
-      if (FastSerdeCache.isFastDeserializer(fastDeserializer)) {
-        cachedFastDeserializer.compareAndSet(null, fastDeserializer);
-        if (LOGGER.isDebugEnabled()) {
-          LOGGER.debug("FastGenericDeserializer was generated and cached for reader schema: ["
-              + readerSchema + "], writer schema: [" + writerSchema + "]");
+      fastDeserializer = getFastDeserializerFromCache(cache, writerSchema, readerSchema, modelData, customization);
+      if (fastDeserializer.hasDynamicClassGenerationDone()) {
+        if (fastDeserializer.isBackedByGeneratedClass()) {
+          /**
+           * Runtime class generation is done successfully, so cache it.
+            */
+          cachedFastDeserializer.compareAndSet(null, fastDeserializer);
+          if (LOGGER.isDebugEnabled()) {
+            LOGGER.debug("FastGenericDeserializer was generated and cached for reader schema: ["
+                + readerSchema + "], writer schema: [" + writerSchema + "]");
+          }
+        } else {
+          /**
+           * Runtime class generation fails, so this class will cache a newly generated cold deserializer, which will
+           * honer {@link FastSerdeCache#isFailFast()}.
+            */
+          cachedFastDeserializer.compareAndSet(null,
+              getRegularAvroImplWhenGenerationFail(writerSchema, readerSchema, modelData, customization));
+          LOGGER.warn("FastGenericDeserializer generation fails, and will cache cold deserializer "
+              + "for reader schema: [" + readerSchema + "], writer schema: [" + writerSchema + "]");
         }
+        fastDeserializer = cachedFastDeserializer.get();
+      } else {
+        fastDeserializer = coldDeserializer;
       }
     }
 
-    return fastDeserializer.deserialize(reuse, in);
+    return fastDeserializer.deserialize(reuse, in, customization);
   }
 
   public CompletableFuture<FastDeserializer<T>> getFastDeserializer() {
     return cachedFastDeserializer.get() != null ? CompletableFuture.completedFuture(cachedFastDeserializer.get())
-        : getFastDeserializer(cache, writerSchema, readerSchema, modelData).thenApply(d -> {
+        : getFastDeserializer(cache, writerSchema, readerSchema, modelData, customization).thenApply(d -> {
           cachedFastDeserializer.compareAndSet(null, d);
           return d;
         });
   }
 
   protected CompletableFuture<FastDeserializer<T>> getFastDeserializer(FastSerdeCache fastSerdeCache,
-      Schema writerSchema, Schema readerSchema, GenericData modelData) {
-    return fastSerdeCache.getFastGenericDeserializerAsync(writerSchema, readerSchema, modelData)
+      Schema writerSchema, Schema readerSchema, GenericData modelData, DatumReaderCustomization customization) {
+    return fastSerdeCache.getFastGenericDeserializerAsync(writerSchema, readerSchema, modelData, customization)
         .thenApply(d -> (FastDeserializer<T>) d);
   }
 
   @SuppressWarnings("unchecked")
   protected FastDeserializer<T> getFastDeserializerFromCache(FastSerdeCache fastSerdeCache, Schema writerSchema,
-      Schema readerSchema, GenericData modelData) {
-    return (FastDeserializer<T>) fastSerdeCache.getFastGenericDeserializer(writerSchema, readerSchema, modelData);
+      Schema readerSchema, GenericData modelData, DatumReaderCustomization customization) {
+    return (FastDeserializer<T>) fastSerdeCache.getFastGenericDeserializer(writerSchema, readerSchema, modelData, customization);
+  }
+
+  protected FastDeserializer<T> getRegularAvroImpl(Schema writerSchema, Schema readerSchema, GenericData modelData, DatumReaderCustomization customization) {
+    return new FastSerdeUtils.FastDeserializerWithAvroGenericImpl<>(writerSchema, readerSchema, modelData, customization, false);
   }
 
-  protected FastDeserializer<T> getRegularAvroImpl(Schema writerSchema, Schema readerSchema, GenericData modelData) {
-    return new FastSerdeCache.FastDeserializerWithAvroGenericImpl<>(writerSchema, readerSchema, modelData);
+  protected FastDeserializer<T> getRegularAvroImplWhenGenerationFail(Schema writerSchema, Schema readerSchema, GenericData modelData, DatumReaderCustomization customization) {
+    return new FastSerdeUtils.FastDeserializerWithAvroGenericImpl<>(writerSchema, readerSchema, modelData, customization, cache.isFailFast(), true);
   }
 
   /**
@@ -129,6 +160,6 @@ protected FastDeserializer<T> getRegularAvroImpl(Schema writerSchema, Schema rea
    */
   public boolean isFastDeserializerUsed() {
     FastDeserializer<T> fastDeserializer = cachedFastDeserializer.get();
-    return fastDeserializer != null && FastSerdeCache.isFastDeserializer(fastDeserializer);
+    return fastDeserializer != null && fastDeserializer.isBackedByGeneratedClass();
   }
 }
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastGenericDatumWriter.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastGenericDatumWriter.java
index 735fc1f91..eb467a728 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastGenericDatumWriter.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastGenericDatumWriter.java
@@ -1,5 +1,6 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import java.io.IOException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericData;
@@ -16,7 +17,9 @@ public class FastGenericDatumWriter<T> implements DatumWriter<T> {
   private static final Logger LOGGER = LoggerFactory.getLogger(FastGenericDatumWriter.class);
   private Schema writerSchema;
   private final GenericData modelData;
-  private final FastSerdeCache cache;
+  protected final FastSerdeCache cache;
+  private final DatumWriterCustomization customization;
+  private final FastSerializer<T> coldSerializer;
   private FastSerializer<T> cachedFastSerializer;
 
   public FastGenericDatumWriter(Schema schema) {
@@ -32,11 +35,16 @@ public FastGenericDatumWriter(Schema schema, FastSerdeCache cache) {
   }
 
   public FastGenericDatumWriter(Schema schema, GenericData modelData, FastSerdeCache cache) {
+    this(schema, modelData, cache, null);
+  }
+  public FastGenericDatumWriter(Schema schema, GenericData modelData, FastSerdeCache cache, DatumWriterCustomization customization) {
     this.writerSchema = schema;
     this.modelData = modelData;
+    this.customization = customization == null ? DatumWriterCustomization.DEFAULT_DATUM_WRITER_CUSTOMIZATION : customization;
     this.cache = cache != null ? cache : FastSerdeCache.getDefaultInstance();
+    this.coldSerializer = getRegularAvroImpl(writerSchema, modelData, this.customization);
     if (!Utils.isSupportedAvroVersionsForSerializer()) {
-      this.cachedFastSerializer = getRegularAvroImpl(writerSchema, modelData);
+      this.cachedFastSerializer = coldSerializer;
       if (LOGGER.isDebugEnabled()) {
         LOGGER.debug(
             "Current avro version: " + Utils.getRuntimeAvroVersion() + " is not supported, and only the following"
@@ -45,7 +53,7 @@ public FastGenericDatumWriter(Schema schema, GenericData modelData, FastSerdeCac
       }
     } else if (!FastSerdeCache.isSupportedForFastSerializer(schema.getType())) {
       // For unsupported schema type, we won't try to fetch it from FastSerdeCache since it is inefficient.
-      this.cachedFastSerializer = getRegularAvroImpl(writerSchema, modelData);
+      this.cachedFastSerializer = coldSerializer;
       if (LOGGER.isDebugEnabled()) {
         LOGGER.debug("Skip the FastGenericSerializer generation since read schema type: " + schema.getType()
             + " is not supported");
@@ -64,30 +72,57 @@ public void write(T data, Encoder out) throws IOException {
     if (cachedFastSerializer != null) {
       fastSerializer = cachedFastSerializer;
     } else {
-      fastSerializer = getFastSerializerFromCache(cache, writerSchema, modelData);
-      if (isFastSerializer(fastSerializer)) {
-        cachedFastSerializer = fastSerializer;
-        if (LOGGER.isDebugEnabled()) {
-          LOGGER.debug("FastSerializer has been generated and cached for writer schema: [" + writerSchema + "]");
+      fastSerializer = getFastSerializerFromCache(cache, writerSchema, modelData, customization);
+
+      if (fastSerializer.hasDynamicClassGenerationDone()) {
+        if (fastSerializer.isBackedByGeneratedClass()) {
+          /**
+           * Runtime class generation is done successfully, so cache it.
+           */
+          cachedFastSerializer = fastSerializer;
+          if (LOGGER.isDebugEnabled()) {
+            LOGGER.debug("FastSerializer has been generated and cached for writer schema: [" + writerSchema + "]");
+          }
+        } else {
+          /**
+           * Runtime class generation fails, so this class will cache a newly generated cold deserializer, which will
+           * honer {@link FastSerdeCache#isFailFast()}.
+           */
+          cachedFastSerializer = getRegularAvroImplWhenGenerationFail(writerSchema, modelData, customization);
+          if (LOGGER.isDebugEnabled()) {
+            LOGGER.debug("FastGenericDeserializer generation fails, and will cache cold serializer for writer schema: [" + writerSchema + "]");
+          }
         }
+        fastSerializer = cachedFastSerializer;
+      } else {
+        /**
+         * Don't use the cached serializer since it may not support the passed customization.
+         */
+        fastSerializer = coldSerializer;
       }
     }
 
-    fastSerializer.serialize(data, out);
+    fastSerializer.serialize(data, out, customization);
   }
 
   @SuppressWarnings("unchecked")
-  protected FastSerializer<T> getFastSerializerFromCache(FastSerdeCache fastSerdeCache, Schema schema, GenericData modelData) {
-    return (FastSerializer<T>) fastSerdeCache.getFastGenericSerializer(schema, modelData);
+  protected FastSerializer<T> getFastSerializerFromCache(FastSerdeCache fastSerdeCache, Schema schema,
+      GenericData modelData, DatumWriterCustomization customization) {
+    return (FastSerializer<T>) fastSerdeCache.getFastGenericSerializer(schema, modelData, customization);
+  }
+
+  protected FastSerializer<T> getRegularAvroImpl(Schema schema, GenericData modelData,
+      DatumWriterCustomization customization) {
+    return new FastSerdeUtils.FastSerializerWithAvroGenericImpl<>(schema, modelData, customization, false);
   }
 
-  protected FastSerializer<T> getRegularAvroImpl(Schema schema, GenericData modelData) {
-    return new FastSerdeCache.FastSerializerWithAvroGenericImpl<>(schema, modelData);
+  protected FastSerializer<T> getRegularAvroImplWhenGenerationFail(Schema schema, GenericData modelData,
+      DatumWriterCustomization customization) {
+    return new FastSerdeUtils.FastSerializerWithAvroGenericImpl<>(schema, modelData, customization, cache.isFailFast(), true);
   }
 
   private static boolean isFastSerializer(FastSerializer<?> serializer) {
-    return !(serializer instanceof FastSerdeCache.FastSerializerWithAvroSpecificImpl
-        || serializer instanceof FastSerdeCache.FastSerializerWithAvroGenericImpl);
+    return serializer.isBackedByGeneratedClass();
   }
 
   /**
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerdeCache.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerdeCache.java
index bcf817acc..992049648 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerdeCache.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerdeCache.java
@@ -3,6 +3,8 @@
 import static com.linkedin.avro.fastserde.Utils.getSchemaFingerprint;
 import static com.linkedin.avroutil1.compatibility.AvroCompatibilityHelper.getSchemaFullName;
 
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.ParameterizedType;
@@ -20,23 +22,14 @@
 import java.util.function.Supplier;
 
 import org.apache.avro.Schema;
-import org.apache.avro.generic.ColdGenericDatumReader;
-import org.apache.avro.generic.ColdSpecificDatumReader;
 import org.apache.avro.generic.GenericData;
 import org.apache.avro.generic.GenericDatumReader;
-import org.apache.avro.io.DatumReader;
-import org.apache.avro.io.DatumWriter;
-import org.apache.avro.io.Decoder;
-import org.apache.avro.io.Encoder;
 import org.apache.avro.specific.SpecificData;
 import org.apache.avro.specific.SpecificDatumReader;
 import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.linkedin.avroutil1.compatibility.AvroCompatibilityHelper;
-
-
 /**
  * Fast avro serializer/deserializer cache. Stores generated and already compiled instances of serializers and
  * deserializers for future use.
@@ -191,8 +184,7 @@ public static boolean isSupportedForFastSerializer(Schema.Type schemaType) {
   }
 
   public static boolean isFastDeserializer(FastDeserializer deserializer) {
-    return !(deserializer instanceof FastDeserializerWithAvroSpecificImpl
-        || deserializer instanceof FastDeserializerWithAvroGenericImpl);
+    return deserializer.isBackedByGeneratedClass();
   }
 
   /**
@@ -202,6 +194,10 @@ public FastDeserializer<?> getFastSpecificDeserializer(Schema writerSchema, Sche
     return getFastSpecificDeserializer(writerSchema, readerSchema, null);
   }
 
+  public FastDeserializer<?> getFastSpecificDeserializer(Schema writerSchema, Schema readerSchema, SpecificData modelData) {
+    return getFastSpecificDeserializer(writerSchema, readerSchema, modelData, null);
+  }
+
   /**
    * Generates if needed and returns specific-class aware avro {@link FastDeserializer}.
    *
@@ -211,9 +207,12 @@ public FastDeserializer<?> getFastSpecificDeserializer(Schema writerSchema, Sche
    *            {@link Schema} intended to be used during deserialization
    * @param modelData
    *            Provides additional information not available in the schema, e.g. conversion classes
+   * @param customization
+   *            Provides customized logic during de-serialization
    * @return specific-class aware avro {@link FastDeserializer}
    */
-  public FastDeserializer<?> getFastSpecificDeserializer(Schema writerSchema, Schema readerSchema, SpecificData modelData) {
+  public FastDeserializer<?> getFastSpecificDeserializer(Schema writerSchema, Schema readerSchema,
+      SpecificData modelData, DatumReaderCustomization customization) {
     String schemaKey = getSchemaKey(writerSchema, readerSchema);
     FastDeserializer<?> deserializer = fastSpecificRecordDeserializersCache.get(schemaKey);
 
@@ -223,11 +222,11 @@ public FastDeserializer<?> getFastSpecificDeserializer(Schema writerSchema, Sche
           schemaKey,
           k -> {
             fastDeserializerMissingInCache.set(true);
-            return new FastDeserializerWithAvroSpecificImpl<>(writerSchema, readerSchema, modelData);
+            return new FastSerdeUtils.FastDeserializerWithAvroSpecificImpl<>(writerSchema, readerSchema, modelData, customization, false);
           });
 
       if (fastDeserializerMissingInCache.get()) {
-        CompletableFuture.supplyAsync(() -> buildSpecificDeserializer(writerSchema, readerSchema, modelData), executor)
+        CompletableFuture.supplyAsync(() -> buildSpecificDeserializer(writerSchema, readerSchema, modelData, customization), executor)
             .thenAccept(d -> fastSpecificRecordDeserializersCache.put(schemaKey, d));
       }
     }
@@ -242,6 +241,10 @@ public FastDeserializer<?> getFastGenericDeserializer(Schema writerSchema, Schem
     return getFastGenericDeserializer(writerSchema, readerSchema, null);
   }
 
+  public FastDeserializer<?> getFastGenericDeserializer(Schema writerSchema, Schema readerSchema, GenericData modelData) {
+    return getFastGenericDeserializer(writerSchema, readerSchema, modelData, null);
+  }
+
   /**
    * Generates if needed and returns generic-class aware avro {@link FastDeserializer}.
    *
@@ -251,9 +254,12 @@ public FastDeserializer<?> getFastGenericDeserializer(Schema writerSchema, Schem
    *            {@link Schema} intended to be used during deserialization
    * @param modelData
    *            Provides additional information not available in the schema, e.g. conversion classes
+   * @param customization
+   *            Provides customized logic during de-serialization
    * @return generic-class aware avro {@link FastDeserializer}
    */
-  public FastDeserializer<?> getFastGenericDeserializer(Schema writerSchema, Schema readerSchema, GenericData modelData) {
+  public FastDeserializer<?> getFastGenericDeserializer(Schema writerSchema, Schema readerSchema,
+      GenericData modelData, DatumReaderCustomization customization) {
     String schemaKey = getSchemaKey(writerSchema, readerSchema);
     FastDeserializer<?> deserializer = fastGenericRecordDeserializersCache.get(schemaKey);
 
@@ -263,22 +269,22 @@ public FastDeserializer<?> getFastGenericDeserializer(Schema writerSchema, Schem
           schemaKey,
           k -> {
             fastDeserializerMissingInCache.set(true);
-            return new FastDeserializerWithAvroGenericImpl<>(writerSchema, readerSchema, modelData);
+            return new FastSerdeUtils.FastDeserializerWithAvroGenericImpl<>(writerSchema, readerSchema, modelData, customization, false);
           });
 
       if (fastDeserializerMissingInCache.get()) {
-        CompletableFuture.supplyAsync(() -> buildGenericDeserializer(writerSchema, readerSchema, modelData), executor)
+        CompletableFuture.supplyAsync(() -> buildGenericDeserializer(writerSchema, readerSchema, modelData, customization), executor)
             .thenAccept(d -> fastGenericRecordDeserializersCache.put(schemaKey, d));
       }
     }
     return deserializer;
   }
-  
+
   /**
-   * @see #getFastSpecificSerializer(Schema, SpecificData)
+   * @see #getFastSpecificSerializer(Schema, SpecificData, DatumWriterCustomization)
    */
   public FastSerializer<?> getFastSpecificSerializer(Schema schema) {
-    return getFastSpecificSerializer(schema, null);
+    return getFastSpecificSerializer(schema, null, null);
   }
 
   /**
@@ -288,9 +294,11 @@ public FastSerializer<?> getFastSpecificSerializer(Schema schema) {
    *            {@link Schema} of data to write
    * @param modelData
    *            Provides additional information not available in the schema, e.g. conversion classes
+   * @param customization
+   *            Provides customized logic during serialization
    * @return specific-class aware avro {@link FastSerializer}
    */
-  public FastSerializer<?> getFastSpecificSerializer(Schema schema, SpecificData modelData) {
+  public FastSerializer<?> getFastSpecificSerializer(Schema schema, SpecificData modelData, DatumWriterCustomization customization) {
     String schemaKey = getSchemaKey(schema, schema);
     FastSerializer<?> serializer = fastSpecificRecordSerializersCache.get(schemaKey);
 
@@ -300,11 +308,11 @@ public FastSerializer<?> getFastSpecificSerializer(Schema schema, SpecificData m
           schemaKey,
           k -> {
             fastSerializerMissingInCache.set(true);
-            return new FastSerializerWithAvroSpecificImpl<>(schema, modelData);
+            return new FastSerdeUtils.FastSerializerWithAvroSpecificImpl<>(schema, modelData, customization, false);
           });
 
       if (fastSerializerMissingInCache.get()) {
-        CompletableFuture.supplyAsync(() -> buildSpecificSerializer(schema, modelData), executor)
+        CompletableFuture.supplyAsync(() -> buildSpecificSerializer(schema, modelData, customization), executor)
             .thenAccept(s -> fastSpecificRecordSerializersCache.put(schemaKey, s));
       }
     }
@@ -313,10 +321,10 @@ public FastSerializer<?> getFastSpecificSerializer(Schema schema, SpecificData m
   }
 
   /**
-   * @see #getFastGenericSerializer(Schema, GenericData)
+   * @see #getFastGenericSerializer(Schema, GenericData, DatumWriterCustomization)
    */
   public FastSerializer<?> getFastGenericSerializer(Schema schema) {
-    return getFastGenericSerializer(schema, null);
+    return getFastGenericSerializer(schema, null, null);
   }
 
   /**
@@ -326,9 +334,11 @@ public FastSerializer<?> getFastGenericSerializer(Schema schema) {
    *            {@link Schema} of data to write
    * @param modelData
    *            Passes additional information e.g. conversion classes not available in the schema
+   * @param customization
+   *            Provides customized logic during serialization
    * @return generic-class aware avro {@link FastSerializer}
    */
-  public FastSerializer<?> getFastGenericSerializer(Schema schema, GenericData modelData) {
+  public FastSerializer<?> getFastGenericSerializer(Schema schema, GenericData modelData, DatumWriterCustomization customization) {
     String schemaKey = getSchemaKey(schema, schema);
     FastSerializer<?> serializer = fastGenericRecordSerializersCache.get(schemaKey);
 
@@ -338,11 +348,11 @@ public FastSerializer<?> getFastGenericSerializer(Schema schema, GenericData mod
           schemaKey,
           k -> {
             fastSerializerMissingInCache.set(true);
-            return new FastSerializerWithAvroGenericImpl<>(schema, modelData);
+            return new FastSerdeUtils.FastSerializerWithAvroGenericImpl<>(schema, modelData, customization, false);
           });
 
       if (fastSerializerMissingInCache.get()) {
-        CompletableFuture.supplyAsync(() -> buildGenericSerializer(schema, modelData), executor)
+        CompletableFuture.supplyAsync(() -> buildGenericSerializer(schema, modelData, customization), executor)
             .thenAccept(s -> fastGenericRecordSerializersCache.put(schemaKey, s));
       }
     }
@@ -351,10 +361,10 @@ public FastSerializer<?> getFastGenericSerializer(Schema schema, GenericData mod
   }
 
   /**
-   * @see #getFastSpecificDeserializerAsync(Schema, Schema, SpecificData)
+   * @see #getFastSpecificDeserializerAsync(Schema, Schema, SpecificData, DatumReaderCustomization)
    */
   public CompletableFuture<FastDeserializer<?>> getFastSpecificDeserializerAsync(Schema writerSchema, Schema readerSchema) {
-    return getFastSpecificDeserializerAsync(writerSchema, readerSchema, null);
+    return getFastSpecificDeserializerAsync(writerSchema, readerSchema, null, null);
   }
 
   /**
@@ -363,18 +373,20 @@ public CompletableFuture<FastDeserializer<?>> getFastSpecificDeserializerAsync(S
    * @param writerSchema {@link Schema} of written data
    * @param readerSchema {@link Schema} intended to be used during deserialization
    * @param modelData Passes additional information e.g. conversion classes not available in the schema
+   * @param customization Provides customized logic during de-serialization
    * @return {@link CompletableFuture} which contains specific-class aware avro {@link FastDeserializer}
    */
-  public CompletableFuture<FastDeserializer<?>> getFastSpecificDeserializerAsync(Schema writerSchema, Schema readerSchema, SpecificData modelData) {
+  public CompletableFuture<FastDeserializer<?>> getFastSpecificDeserializerAsync(Schema writerSchema,
+      Schema readerSchema, SpecificData modelData, DatumReaderCustomization customization) {
     return getFastDeserializerAsync(writerSchema, readerSchema, fastSpecificRecordDeserializersCache,
-        () -> buildSpecificDeserializer(writerSchema, readerSchema, modelData));
+        () -> buildSpecificDeserializer(writerSchema, readerSchema, modelData, customization));
   }
 
   /**
-   * @see #getFastGenericDeserializerAsync(Schema, Schema, GenericData)
+   * @see #getFastGenericDeserializerAsync(Schema, Schema, GenericData, DatumReaderCustomization)
    */
   public CompletableFuture<FastDeserializer<?>> getFastGenericDeserializerAsync(Schema writerSchema, Schema readerSchema) {
-    return getFastGenericDeserializerAsync(writerSchema, readerSchema, null);
+    return getFastGenericDeserializerAsync(writerSchema, readerSchema, null, null);
   }
 
   /**
@@ -383,11 +395,13 @@ public CompletableFuture<FastDeserializer<?>> getFastGenericDeserializerAsync(Sc
    * @param writerSchema {@link Schema} of written data
    * @param readerSchema {@link Schema} intended to be used during deserialization
    * @param modelData Passes additional information e.g. conversion classes not available in the schema
+   * @param customization Provides customized logic during de-serialization
    * @return {@link CompletableFuture} which contains generic-class aware avro {@link FastDeserializer}
    */
-  public CompletableFuture<FastDeserializer<?>> getFastGenericDeserializerAsync(Schema writerSchema, Schema readerSchema, GenericData modelData) {
+  public CompletableFuture<FastDeserializer<?>> getFastGenericDeserializerAsync(Schema writerSchema, Schema readerSchema,
+      GenericData modelData, DatumReaderCustomization customization) {
     return getFastDeserializerAsync(writerSchema, readerSchema, fastGenericRecordDeserializersCache,
-        () -> buildGenericDeserializer(writerSchema, readerSchema, modelData));
+        () -> buildGenericDeserializer(writerSchema, readerSchema, modelData, customization));
   }
 
   private CompletableFuture<FastDeserializer<?>> getFastDeserializerAsync(Schema writerSchema, Schema readerSchema,
@@ -451,7 +465,8 @@ public FastDeserializer<?> buildFastSpecificDeserializer(Schema writerSchema, Sc
    *            Provides additional information not available in the schema, e.g. conversion classes
    * @return
    */
-  private FastDeserializer<?> buildSpecificDeserializer(Schema writerSchema, Schema readerSchema, SpecificData modelData) {
+  private FastDeserializer<?> buildSpecificDeserializer(Schema writerSchema, Schema readerSchema,
+      SpecificData modelData, DatumReaderCustomization customization) {
     try {
       return buildFastSpecificDeserializer(writerSchema, readerSchema, modelData);
     } catch (FastDeserializerGeneratorException e) {
@@ -461,17 +476,7 @@ private FastDeserializer<?> buildSpecificDeserializer(Schema writerSchema, Schem
       LOGGER.error("Deserializer class instantiation exception", e);
     }
 
-    return new FastDeserializer<Object>() {
-      private DatumReader datumReader = AvroCompatibilityHelper.newSpecificDatumReader(writerSchema, readerSchema, modelData);
-
-      @Override
-      public Object deserialize(Object reuse, Decoder d) throws IOException {
-        if (failFast) {
-          throw new UnsupportedOperationException("Fast specific deserializer could not be generated.");
-        }
-        return datumReader.read(reuse, d);
-      }
-    };
+    return new FastSerdeUtils.FastDeserializerWithAvroSpecificImpl(writerSchema, readerSchema, modelData, customization, failFast, true);
   }
 
   /**
@@ -490,7 +495,8 @@ public FastDeserializer<?> buildFastGenericDeserializer(Schema writerSchema, Sch
    * @param modelData Provides additional information not available in the schema, e.g. conversion classes
    * @return a fast deserializer
    */
-  public FastDeserializer<?> buildFastGenericDeserializer(Schema writerSchema, Schema readerSchema, GenericData modelData) {
+  public FastDeserializer<?> buildFastGenericDeserializer(Schema writerSchema, Schema readerSchema,
+      GenericData modelData) {
     FastGenericDeserializerGenerator<?> generator =
         new FastGenericDeserializerGenerator<>(writerSchema, readerSchema, classesDir, classLoader, compileClassPath, modelData);
 
@@ -519,7 +525,8 @@ public FastDeserializer<?> buildFastGenericDeserializer(Schema writerSchema, Sch
    * @param modelData Provides additional information not available in the schema, e.g. conversion classes
    * @return
    */
-  private FastDeserializer<?> buildGenericDeserializer(Schema writerSchema, Schema readerSchema, GenericData modelData) {
+  private FastDeserializer<?> buildGenericDeserializer(Schema writerSchema, Schema readerSchema,
+      GenericData modelData, DatumReaderCustomization customization) {
     try {
       return buildFastGenericDeserializer(writerSchema, readerSchema, modelData);
     } catch (FastDeserializerGeneratorException e) {
@@ -529,21 +536,7 @@ private FastDeserializer<?> buildGenericDeserializer(Schema writerSchema, Schema
       LOGGER.error("Deserializer class instantiation exception:", e);
     }
 
-    return new FastDeserializer<Object>() {
-      private DatumReader datumReader = AvroCompatibilityHelper.newGenericDatumReader(writerSchema, readerSchema, modelData);
-
-      @Override
-      public Object deserialize(Object reuse, Decoder d) throws IOException {
-        if (failFast) {
-          throw new UnsupportedOperationException("Fast generic deserializer could not be generated.");
-        }
-        return datumReader.read(reuse, d);
-      }
-    };
-  }
-
-  public FastSerializer<?> buildFastSpecificSerializer(Schema schema) {
-    return buildFastSpecificSerializer(schema, null);
+    return new FastSerdeUtils.FastDeserializerWithAvroGenericImpl(writerSchema, readerSchema, modelData, customization, failFast, true);
   }
 
   public FastSerializer<?> buildFastSpecificSerializer(Schema schema, SpecificData modelData) {
@@ -567,7 +560,7 @@ public FastSerializer<?> buildFastSpecificSerializer(Schema schema, SpecificData
     return generator.generateSerializer();
   }
 
-  private FastSerializer<?> buildSpecificSerializer(Schema schema, SpecificData modelData) {
+  private FastSerializer<?> buildSpecificSerializer(Schema schema, SpecificData modelData, DatumWriterCustomization customization) {
     if (Utils.isSupportedAvroVersionsForSerializer()) {
       // Only build fast specific serializer for supported Avro versions.
       try {
@@ -580,18 +573,7 @@ private FastSerializer<?> buildSpecificSerializer(Schema schema, SpecificData mo
       }
     }
 
-    return new FastSerializer<Object>() {
-      private final DatumWriter datumWriter = AvroCompatibilityHelper.newSpecificDatumWriter(schema,
-              modelData != null ? modelData : SpecificData.get());
-
-      @Override
-      public void serialize(Object data, Encoder e) throws IOException {
-        if (failFast) {
-          throw new UnsupportedOperationException("Fast specific serializer could not be generated.");
-        }
-        datumWriter.write(data, e);
-      }
-    };
+    return new FastSerdeUtils.FastSerializerWithAvroSpecificImpl<>(schema, modelData, customization, failFast, true);
   }
 
   public FastSerializer<?> buildFastGenericSerializer(Schema schema) {
@@ -619,7 +601,7 @@ public FastSerializer<?> buildFastGenericSerializer(Schema schema, GenericData m
     return generator.generateSerializer();
   }
 
-  private FastSerializer<?> buildGenericSerializer(Schema schema, GenericData modelData) {
+  private FastSerializer<?> buildGenericSerializer(Schema schema, GenericData modelData, DatumWriterCustomization customization) {
     if (Utils.isSupportedAvroVersionsForSerializer()) {
       // Only build fast generic serializer for supported Avro versions.
       try {
@@ -632,18 +614,11 @@ private FastSerializer<?> buildGenericSerializer(Schema schema, GenericData mode
       }
     }
 
-    return new FastSerializer<Object>() {
-      private final DatumWriter datumWriter = AvroCompatibilityHelper.newGenericDatumWriter(schema,
-              modelData != null ? modelData : GenericData.get());
+    return new FastSerdeUtils.FastSerializerWithAvroGenericImpl<>(schema, modelData, customization, failFast, true);
+  }
 
-      @Override
-      public void serialize(Object data, Encoder e) throws IOException {
-        if (failFast) {
-          throw new UnsupportedOperationException("Fast generic serializer could not be generated.");
-        }
-        datumWriter.write(data, e);
-      }
-    };
+  public boolean isFailFast() {
+    return failFast;
   }
 
   private Executor getDefaultExecutor() {
@@ -659,62 +634,4 @@ public Thread newThread(Runnable runnable) {
       }
     });
   }
-
-  public static class FastDeserializerWithAvroSpecificImpl<V> implements FastDeserializer<V> {
-    private final SpecificDatumReader<V> datumReader;
-
-    public FastDeserializerWithAvroSpecificImpl(Schema writerSchema, Schema readerSchema, SpecificData modelData) {
-      this.datumReader = ColdSpecificDatumReader.of(writerSchema, readerSchema, modelData);
-    }
-
-    @Override
-    public V deserialize(V reuse, Decoder d) throws IOException {
-      return datumReader.read(reuse, d);
-    }
-  }
-
-  public static class FastDeserializerWithAvroGenericImpl<V> implements FastDeserializer<V> {
-    private final GenericDatumReader<V> datumReader;
-
-    public FastDeserializerWithAvroGenericImpl(Schema writerSchema, Schema readerSchema, GenericData modelData) {
-      this.datumReader = ColdGenericDatumReader.of(writerSchema, readerSchema, modelData);
-    }
-
-    @Override
-    public V deserialize(V reuse, Decoder d) throws IOException {
-      return datumReader.read(reuse, d);
-    }
-  }
-
-  public static class FastSerializerWithAvroSpecificImpl<V> implements FastSerializer<V> {
-    private final DatumWriter<V> datumWriter;
-
-    public FastSerializerWithAvroSpecificImpl(Schema schema) {
-      this(schema, null);
-    }
-
-    public FastSerializerWithAvroSpecificImpl(Schema schema, SpecificData modelData) {
-      this.datumWriter = AvroCompatibilityHelper.newSpecificDatumWriter(schema,
-              modelData != null ? modelData : SpecificData.get());
-    }
-
-    @Override
-    public void serialize(V data, Encoder e) throws IOException {
-      datumWriter.write(data, e);
-    }
-  }
-
-  public static class FastSerializerWithAvroGenericImpl<V> implements FastSerializer<V> {
-    private final DatumWriter<V> datumWriter;
-
-    public FastSerializerWithAvroGenericImpl(Schema schema, GenericData modelData) {
-      this.datumWriter = AvroCompatibilityHelper.newGenericDatumWriter(schema,
-              modelData != null ? modelData : GenericData.get());
-    }
-
-    @Override
-    public void serialize(V data, Encoder e) throws IOException {
-      datumWriter.write(data, e);
-    }
-  }
 }
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerdeUtils.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerdeUtils.java
new file mode 100644
index 000000000..ba590bd6e
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerdeUtils.java
@@ -0,0 +1,217 @@
+package com.linkedin.avro.fastserde;
+
+import org.apache.avro.generic.CustomizedGenericDatumReader;
+import org.apache.avro.generic.CustomizedGenericDatumReaderForAvro14;
+import org.apache.avro.generic.CustomizedGenericDatumWriter;
+import org.apache.avro.generic.CustomizedSpecificDatumReader;
+import org.apache.avro.generic.CustomizedSpecificDatumReaderForAvro14;
+import org.apache.avro.generic.CustomizedSpecificDatumWriter;
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
+import com.linkedin.avroutil1.compatibility.AvroCompatibilityHelper;
+import java.io.IOException;
+import org.apache.avro.Schema;
+import org.apache.avro.generic.ColdGenericDatumReader;
+import org.apache.avro.generic.ColdSpecificDatumReader;
+import org.apache.avro.generic.GenericData;
+import org.apache.avro.generic.GenericDatumReader;
+import org.apache.avro.io.DatumWriter;
+import org.apache.avro.io.Decoder;
+import org.apache.avro.io.Encoder;
+import org.apache.avro.specific.SpecificData;
+import org.apache.avro.specific.SpecificDatumReader;
+
+
+/**
+ * This utility class includes several vanilla Avro based {@link FastDeserializer} and {@link FastSerializer} for the following scenarios:
+ * 1. Before fast class generation is completed, and the class defined here will be used with flag: runtimeClassGenerationDone to be `false`.
+ * 2. The same set of class will be used with flag: runtimeClassGenerationDone to be `true` when class generation fails.
+ * For #1, Fast Datum Reader/Writer will keep polling fast classes and for #2, it will stop polling since it will
+ * know the fast class generation fails, and it is useless to keep polling.
+ */
+public class FastSerdeUtils {
+  public static class FastDeserializerWithAvroSpecificImpl<V> implements FastDeserializer<V> {
+    private final SpecificDatumReader<V> customizedDatumReader;
+    private final DatumReaderCustomization customization;
+    private final boolean failFast;
+    private final boolean runtimeClassGenerationDone;
+
+    public FastDeserializerWithAvroSpecificImpl(Schema writerSchema, Schema readerSchema, SpecificData modelData,
+        boolean runtimeClassGenerationDone) {
+      this(writerSchema, readerSchema, modelData, null, false, runtimeClassGenerationDone);
+    }
+
+    public FastDeserializerWithAvroSpecificImpl(Schema writerSchema, Schema readerSchema, SpecificData modelData
+        , DatumReaderCustomization customization, boolean runtimeClassGenerationDone) {
+      this(writerSchema, readerSchema, modelData, customization, false, runtimeClassGenerationDone);
+    }
+
+    public FastDeserializerWithAvroSpecificImpl(Schema writerSchema, Schema readerSchema,
+        SpecificData modelData, DatumReaderCustomization customization, boolean failFast, boolean runtimeClassGenerationDone) {
+      this.customization = customization == null ? DatumReaderCustomization.DEFAULT_DATUM_READER_CUSTOMIZATION : customization;
+      this.customizedDatumReader = Utils.isAvro14() ?
+          new CustomizedSpecificDatumReaderForAvro14(writerSchema, readerSchema, this.customization) :
+          new CustomizedSpecificDatumReader<>(writerSchema, readerSchema, modelData, this.customization);
+      this.failFast = failFast;
+      this.runtimeClassGenerationDone = runtimeClassGenerationDone;
+    }
+
+    @Override
+    public V deserialize(V reuse, Decoder d, DatumReaderCustomization customization) throws IOException {
+      if (failFast) {
+        throw new UnsupportedOperationException("Fast specific deserializer could not be generated.");
+      }
+      if (this.customization != customization) {
+        throw new IllegalArgumentException(
+            "The provided 'customization' doesn't equal to the param passed in the constructor");
+      }
+      return this.customizedDatumReader.read(reuse, d);
+    }
+
+
+    @Override
+    public boolean hasDynamicClassGenerationDone() {
+      return runtimeClassGenerationDone;
+    }
+
+    @Override
+    public boolean isBackedByGeneratedClass() {
+      return false;
+    }
+  }
+
+  public static class FastDeserializerWithAvroGenericImpl<V> implements FastDeserializer<V> {
+    private final GenericDatumReader<V> customizedDatumReader;
+    private final DatumReaderCustomization customization;
+    private final boolean failFast;
+    private final boolean runtimeClassGenerationDone;
+
+    public FastDeserializerWithAvroGenericImpl(Schema writerSchema, Schema readerSchema,
+        GenericData modelData, boolean runtimeClassGenerationDone) {
+      this(writerSchema, readerSchema, modelData, null, false, runtimeClassGenerationDone);
+    }
+
+    public FastDeserializerWithAvroGenericImpl(Schema writerSchema, Schema readerSchema, GenericData modelData,
+        DatumReaderCustomization customization, boolean runtimeClassGenerationDone) {
+      this(writerSchema, readerSchema, modelData, customization, false, runtimeClassGenerationDone);
+    }
+
+    public FastDeserializerWithAvroGenericImpl(Schema writerSchema, Schema readerSchema,
+        GenericData modelData, DatumReaderCustomization customization, boolean failFast, boolean runtimeClassGenerationDone) {
+      this.customization = customization == null ? DatumReaderCustomization.DEFAULT_DATUM_READER_CUSTOMIZATION : customization;
+      this.customizedDatumReader = Utils.isAvro14() ?
+          new CustomizedGenericDatumReaderForAvro14(writerSchema, readerSchema, this.customization) :
+          new CustomizedGenericDatumReader<>(writerSchema, readerSchema, modelData, this.customization);
+
+      this.failFast = failFast;
+      this.runtimeClassGenerationDone = runtimeClassGenerationDone;
+    }
+
+    @Override
+    public V deserialize(V reuse, Decoder d, DatumReaderCustomization customization) throws IOException {
+      if (failFast) {
+        throw new UnsupportedOperationException("Fast generic deserializer could not be generated.");
+      }
+      if (this.customization != customization) {
+        throw new IllegalArgumentException("The provided 'customization' doesn't equal to the param passed in the constructor");
+      }
+      return this.customizedDatumReader.read(reuse, d);
+    }
+
+    @Override
+    public boolean hasDynamicClassGenerationDone() {
+      return runtimeClassGenerationDone;
+    }
+
+    @Override
+    public boolean isBackedByGeneratedClass() {
+      return false;
+    }
+  }
+
+  public static class FastSerializerWithAvroSpecificImpl<V> implements FastSerializer<V> {
+    private final CustomizedSpecificDatumWriter<V> customizedDatumWriter;
+    private final DatumWriterCustomization customization;
+    private final boolean failFast;
+    private final boolean runtimeClassGenerationDone;
+
+    public FastSerializerWithAvroSpecificImpl(Schema schema, SpecificData modelData,
+        DatumWriterCustomization customization, boolean runtimeClassGenerationDone) {
+      this(schema, modelData, customization, false, runtimeClassGenerationDone);
+    }
+
+    public FastSerializerWithAvroSpecificImpl(Schema schema, SpecificData modelData,
+        DatumWriterCustomization customization, boolean failFast, boolean runtimeClassGenerationDone) {
+      modelData = modelData != null ? modelData : SpecificData.get();
+      this.customization = customization == null ? DatumWriterCustomization.DEFAULT_DATUM_WRITER_CUSTOMIZATION : customization;
+      this.customizedDatumWriter = new CustomizedSpecificDatumWriter<>(schema, modelData, this.customization);
+      this.failFast = failFast;
+      this.runtimeClassGenerationDone = runtimeClassGenerationDone;
+    }
+
+    @Override
+    public void serialize(V data, Encoder e, DatumWriterCustomization customization) throws IOException {
+      if (failFast) {
+        throw new UnsupportedOperationException("Fast specific serializer could not be generated.");
+      }
+
+      if (this.customization != customization) {
+        throw new IllegalArgumentException("The provided 'customization' doesn't equal to the param passed in the constructor");
+      }
+      customizedDatumWriter.write(data, e);
+    }
+
+    @Override
+    public boolean hasDynamicClassGenerationDone() {
+      return runtimeClassGenerationDone;
+    }
+
+    @Override
+    public boolean isBackedByGeneratedClass() {
+      return false;
+    }
+  }
+
+  public static class FastSerializerWithAvroGenericImpl<V> implements FastSerializer<V> {
+    private final CustomizedGenericDatumWriter<V> customizedDatumWriter;
+    private final DatumWriterCustomization customization;
+    private final boolean failFast;
+    private final boolean runtimeClassGenerationDone;
+
+    public FastSerializerWithAvroGenericImpl(Schema schema, GenericData modelData,
+        DatumWriterCustomization customization, boolean runtimeClassGenerationDone) {
+      this(schema, modelData, customization, false, runtimeClassGenerationDone);
+    }
+
+    public FastSerializerWithAvroGenericImpl(Schema schema, GenericData modelData,
+        DatumWriterCustomization customization, boolean failFast, boolean runtimeClassGenerationDone) {
+      modelData = modelData != null ? modelData : GenericData.get();
+      this.customization = customization == null ? DatumWriterCustomization.DEFAULT_DATUM_WRITER_CUSTOMIZATION : customization;
+      this.customizedDatumWriter = new CustomizedGenericDatumWriter<>(schema, modelData, this.customization);
+      this.failFast = failFast;
+      this.runtimeClassGenerationDone = runtimeClassGenerationDone;
+    }
+
+    @Override
+    public void serialize(V data, Encoder e, DatumWriterCustomization customization) throws IOException {
+      if (failFast) {
+        throw new UnsupportedOperationException("Fast generic serializer could not be generated.");
+      }
+      if (this.customization != customization) {
+        throw new IllegalArgumentException("The provided 'customization' doesn't equal to the param passed in the constructor");
+      }
+      customizedDatumWriter.write(data, e);
+    }
+
+    @Override
+    public boolean hasDynamicClassGenerationDone() {
+      return runtimeClassGenerationDone;
+    }
+
+    @Override
+    public boolean isBackedByGeneratedClass() {
+      return false;
+    }
+
+  }
+}
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerializer.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerializer.java
index 1cf2fac68..976dc7321 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerializer.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerializer.java
@@ -1,10 +1,17 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import java.io.IOException;
 import org.apache.avro.io.Encoder;
 
+import static com.linkedin.avro.fastserde.customized.DatumWriterCustomization.*;
 
-public interface FastSerializer<T> {
 
-  void serialize(T data, Encoder e) throws IOException;
+public interface FastSerializer<T>  extends FastClassStatus {
+
+  default void serialize(T data, Encoder e) throws IOException {
+    serialize(data, e, DEFAULT_DATUM_WRITER_CUSTOMIZATION);
+  }
+
+  void serialize(T data, Encoder e, DatumWriterCustomization customization) throws IOException;
 }
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerializerGenerator.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerializerGenerator.java
index 00d994e1c..8d8525f08 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerializerGenerator.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSerializerGenerator.java
@@ -1,5 +1,6 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import com.linkedin.avroutil1.compatibility.AvroCompatibilityHelper;
 import com.sun.codemodel.JBlock;
 import com.sun.codemodel.JClass;
@@ -21,6 +22,7 @@
 import java.util.List;
 import java.util.Map;
 
+import java.util.function.Supplier;
 import org.apache.avro.Conversion;
 import org.apache.avro.Conversions;
 import org.apache.avro.Schema;
@@ -35,6 +37,7 @@ public class FastSerializerGenerator<T, U extends GenericData> extends FastSerde
   private static int FIELDS_PER_RECORD_SERIALIZATION_METHOD = 20;
 
   private static final String ENCODER = "encoder";
+  private static final String VAR_NAME_FOR_CUSTOMIZATION = "customization";
   protected final Schema schema;
 
   private final Map<String, JMethod> serializeMethodMap = new HashMap<>();
@@ -74,22 +77,24 @@ public FastSerializer<T> generateSerializer() {
       JClass outputClass = schemaAssistant.classFromSchema(schema);
       generatedClass._implements(codeModel.ref(FastSerializer.class).narrow(outputClass));
       serializeMethodParam = serializeMethod.param(outputClass, "data");
+      final Supplier<JExpression> customizationSupplier = () -> JExpr.direct(VAR_NAME_FOR_CUSTOMIZATION);
 
       switch (schema.getType()) {
         case RECORD:
-          processRecord(schema, serializeMethodParam, serializeMethod.body());
+          processRecord(schema, serializeMethodParam, serializeMethod.body(), customizationSupplier);
           break;
         case ARRAY:
-          processArray(schema, serializeMethodParam, serializeMethod.body());
+          processArray(schema, serializeMethodParam, serializeMethod.body(), customizationSupplier);
           break;
         case MAP:
-          processMap(schema, serializeMethodParam, serializeMethod.body());
+          processMap(schema, serializeMethodParam, serializeMethod.body(), customizationSupplier);
           break;
         default:
           throw new FastSerdeGeneratorException("Unsupported input schema type: " + schema.getType());
       }
 
       serializeMethod.param(codeModel.ref(Encoder.class), ENCODER);
+      serializeMethod.param(codeModel.ref(DatumWriterCustomization.class), VAR_NAME_FOR_CUSTOMIZATION);
       serializeMethod._throws(codeModel.ref(IOException.class));
 
       @SuppressWarnings("unchecked")
@@ -103,19 +108,19 @@ public FastSerializer<T> generateSerializer() {
     }
   }
 
-  private void processComplexType(Schema schema, JExpression valueExpr, JBlock body) {
+  private void processComplexType(Schema schema, JExpression valueExpr, JBlock body, Supplier<JExpression> customizationSupplier) {
     switch (schema.getType()) {
       case RECORD:
-        processRecord(schema, valueExpr, body);
+        processRecord(schema, valueExpr, body, customizationSupplier);
         break;
       case ARRAY:
-        processArray(schema, valueExpr, body);
+        processArray(schema, valueExpr, body, customizationSupplier);
         break;
       case UNION:
-        processUnion(schema, valueExpr, body);
+        processUnion(schema, valueExpr, body, customizationSupplier);
         break;
       case MAP:
-        processMap(schema, valueExpr, body);
+        processMap(schema, valueExpr, body, customizationSupplier);
         break;
       default:
         throw new FastSerdeGeneratorException("Not a complex schema type: " + schema.getType());
@@ -140,13 +145,13 @@ private void processSimpleType(Schema schema, JExpression valueExpression, JBloc
     }
   }
 
-  private void processRecord(final Schema recordSchema, JExpression recordExpr, final JBlock containerBody) {
+  private void processRecord(final Schema recordSchema, JExpression recordExpr, final JBlock containerBody, Supplier<JExpression> customizationSupplier) {
     if (methodAlreadyDefined(recordSchema)) {
-      containerBody.invoke(getMethod(recordSchema)).arg(recordExpr).arg(JExpr.direct(ENCODER));
+      containerBody.invoke(getMethod(recordSchema)).arg(recordExpr).arg(JExpr.direct(ENCODER)).arg(customizationSupplier.get());
       return;
     }
     JMethod method = createMethod(recordSchema);
-    containerBody.invoke(getMethod(recordSchema)).arg(recordExpr).arg(JExpr.direct(ENCODER));
+    containerBody.invoke(getMethod(recordSchema)).arg(recordExpr).arg(JExpr.direct(ENCODER)).arg(customizationSupplier.get());
 
     JBlock methodBody = method.body();
     recordExpr = method.listParams()[0];
@@ -165,10 +170,11 @@ private void processRecord(final Schema recordSchema, JExpression recordExpr, fi
         popMethod._throws(IOException.class);
         popMethod.param(schemaAssistant.classFromSchema(recordSchema), "data");
         popMethod.param(Encoder.class, ENCODER);
+        popMethod.param(DatumWriterCustomization.class, VAR_NAME_FOR_CUSTOMIZATION);
         popMethod.annotate(SuppressWarnings.class).param("value", "unchecked");
 
         popMethodBody = popMethod.body();
-        methodBody.invoke(popMethod).arg(recordExpr).arg(JExpr.direct(ENCODER));
+        methodBody.invoke(popMethod).arg(recordExpr).arg(JExpr.direct(ENCODER)).arg(customizationSupplier.get());
       }
 
       Schema fieldSchema = field.schema();
@@ -177,14 +183,14 @@ private void processRecord(final Schema recordSchema, JExpression recordExpr, fi
       if (SchemaAssistant.isComplexType(fieldSchema)) {
         JClass fieldClass = schemaAssistant.classFromSchema(fieldSchema);
         JVar containerVar = popMethodBody.decl(fieldClass, getUniqueName(field.name()), JExpr.cast(fieldClass, fieldValueGetter));
-        processComplexType(fieldSchema, containerVar, popMethodBody);
+        processComplexType(fieldSchema, containerVar, popMethodBody, customizationSupplier);
       } else {
         processSimpleType(fieldSchema, fieldValueGetter, popMethodBody);
       }
     }
   }
 
-  private void processArray(final Schema arraySchema, JExpression arrayExpr, JBlock body) {
+  private void processArray(final Schema arraySchema, JExpression arrayExpr, JBlock body, Supplier<JExpression> customizationSupplier) {
     final JClass arrayClass = schemaAssistant.classFromSchema(arraySchema);
     body.invoke(JExpr.direct(ENCODER), "writeArrayStart");
 
@@ -215,22 +221,22 @@ private void processArray(final Schema arraySchema, JExpression arrayExpr, JBloc
                   "bufferBackedPrimitiveFloatList", JExpr.cast(bufferBackedPrimitiveFloatListClass, primitiveList));
               then3.invoke(bufferBackedPrimitiveFloatList, "writeFloats").arg(JExpr.direct(ENCODER));
             }, else3 -> {
-              processArrayElementLoop(arraySchema, arrayClass, primitiveList, else3, "getPrimitive");
+              processArrayElementLoop(arraySchema, arrayClass, primitiveList, else3, "getPrimitive", customizationSupplier);
             });
           } else {
-            processArrayElementLoop(arraySchema, arrayClass, primitiveList, then2, "getPrimitive");
+            processArrayElementLoop(arraySchema, arrayClass, primitiveList, then2, "getPrimitive", customizationSupplier);
           }
         }, else2 -> {
-          processArrayElementLoop(arraySchema, arrayClass, arrayExpr, else2, "get");
+          processArrayElementLoop(arraySchema, arrayClass, arrayExpr, else2, "get", customizationSupplier);
         });
       } else {
-        processArrayElementLoop(arraySchema, arrayClass, arrayExpr, else1, "get");
+        processArrayElementLoop(arraySchema, arrayClass, arrayExpr, else1, "get", customizationSupplier);
       }
     });
     body.invoke(JExpr.direct(ENCODER), "writeArrayEnd");
   }
 
-  private void processArrayElementLoop(final Schema arraySchema, final JClass arrayClass, JExpression arrayExpr, JBlock body, String getMethodName) {
+  private void processArrayElementLoop(final Schema arraySchema, final JClass arrayClass, JExpression arrayExpr, JBlock body, String getMethodName, Supplier<JExpression> customizationSupplier) {
     final JForLoop forLoop = body._for();
     final JVar counter = forLoop.init(codeModel.INT, getUniqueName("counter"), JExpr.lit(0));
     forLoop.test(counter.lt(JExpr.invoke(arrayExpr, "size")));
@@ -242,16 +248,18 @@ private void processArrayElementLoop(final Schema arraySchema, final JClass arra
     if (SchemaAssistant.isComplexType(elementSchema)) {
       JVar containerVar = declareValueVar(elementSchema.getName(), elementSchema, forBody);
       forBody.assign(containerVar, JExpr.invoke(JExpr.cast(arrayClass, arrayExpr), getMethodName).arg(counter));
-      processComplexType(elementSchema, containerVar, forBody);
+      processComplexType(elementSchema, containerVar, forBody, customizationSupplier);
     } else {
       processSimpleType(elementSchema, arrayExpr.invoke(getMethodName).arg(counter), forBody, false);
     }
   }
 
-  private void processMap(final Schema mapSchema, JExpression mapExpr, JBlock body) {
+  private void processMap(final Schema mapSchema, JExpression mapExpr, JBlock body, Supplier<JExpression> customizationSupplier) {
     final JClass mapClass = schemaAssistant.classFromSchema(mapSchema);
     JClass keyClass = schemaAssistant.findStringClass(mapSchema);
 
+    body.invoke(JExpr.invoke(customizationSupplier.get(),"getCheckMapTypeFunction"),"apply").arg(mapExpr);
+
     body.invoke(JExpr.direct(ENCODER), "writeMapStart");
 
     final JExpression emptyMapCondition = mapExpr.eq(JExpr._null()).cor(JExpr.invoke(mapExpr, "isEmpty"));
@@ -285,7 +293,7 @@ private void processMap(final Schema mapSchema, JExpression mapExpr, JBlock body
       containerVar = declareValueVar(valueSchema.getName(), valueSchema, forBody);
       forBody.assign(containerVar, JExpr.invoke(JExpr.cast(mapClass, mapExpr), "get").arg(mapKeysLoop.var()));
 
-      processComplexType(valueSchema, containerVar, forBody);
+      processComplexType(valueSchema, containerVar, forBody, customizationSupplier);
     } else {
       processSimpleType(valueSchema, mapExpr.invoke("get").arg(mapKeysLoop.var()), forBody);
     }
@@ -312,7 +320,7 @@ private Integer getIndexNamedForUnion(Schema unionSchema, Schema schema) {
     throw new RuntimeException("Unknown schema: " + schema + " in union schema: " + unionSchema);
   }
 
-  private void processUnion(final Schema unionSchema, final JExpression unionExpr, final JBlock body) {
+  private void processUnion(final Schema unionSchema, final JExpression unionExpr, final JBlock body, Supplier<JExpression> customizationSupplier) {
     JConditional ifBlock = null;
 
     for (Schema schemaOption : unionSchema.getTypes()) {
@@ -387,7 +395,7 @@ private void processUnion(final Schema unionSchema, final JExpression unionExpr,
       }
 
       if (SchemaAssistant.isComplexType(schemaOption)) {
-        processComplexType(schemaOption, JExpr.cast(optionClass, unionExpr), unionTypeProcessingBlock);
+        processComplexType(schemaOption, JExpr.cast(optionClass, unionExpr), unionTypeProcessingBlock, customizationSupplier);
       } else {
         processSimpleType(schemaOption, unionExpr, unionTypeProcessingBlock);
       }
@@ -551,6 +559,7 @@ private JMethod createMethod(final Schema schema) {
         method._throws(IOException.class);
         method.param(schemaAssistant.classFromSchema(schema), "data");
         method.param(Encoder.class, ENCODER);
+        method.param(DatumWriterCustomization.class, VAR_NAME_FOR_CUSTOMIZATION);
 
         method.annotate(SuppressWarnings.class).param("value", "unchecked");
         serializeMethodMap.put(AvroCompatibilityHelper.getSchemaFullName(schema), method);
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSpecificDatumReader.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSpecificDatumReader.java
index d621181f0..de73e3c67 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSpecificDatumReader.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSpecificDatumReader.java
@@ -1,5 +1,6 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
 import java.util.concurrent.CompletableFuture;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericData;
@@ -38,19 +39,27 @@ public FastSpecificDatumReader(Schema writerSchema, Schema readerSchema, FastSer
   @SuppressWarnings("unchecked")
   @Override
   protected FastDeserializer<T> getFastDeserializerFromCache(FastSerdeCache fastSerdeCache, Schema writeSchema,
-      Schema readerSchema, GenericData specificData) {
-    return (FastDeserializer<T>) fastSerdeCache.getFastSpecificDeserializer(writeSchema, readerSchema, (SpecificData) specificData);
+      Schema readerSchema, GenericData specificData, DatumReaderCustomization customization) {
+    return (FastDeserializer<T>) fastSerdeCache.getFastSpecificDeserializer(writeSchema, readerSchema, (SpecificData) specificData, customization);
   }
 
   @Override
   protected CompletableFuture<FastDeserializer<T>> getFastDeserializer(FastSerdeCache fastSerdeCache,
-      Schema writerSchema, Schema readerSchema, GenericData specificData) {
-    return fastSerdeCache.getFastSpecificDeserializerAsync(writerSchema, readerSchema, (SpecificData) specificData)
+      Schema writerSchema, Schema readerSchema, GenericData specificData, DatumReaderCustomization customization) {
+    return fastSerdeCache.getFastSpecificDeserializerAsync(writerSchema, readerSchema, (SpecificData) specificData, customization)
         .thenApply(d -> (FastDeserializer<T>) d);
   }
 
   @Override
-  protected FastDeserializer<T> getRegularAvroImpl(Schema writerSchema, Schema readerSchema, GenericData specificData) {
-    return new FastSerdeCache.FastDeserializerWithAvroSpecificImpl<>(writerSchema, readerSchema, (SpecificData) specificData);
+  protected FastDeserializer<T> getRegularAvroImpl(Schema writerSchema, Schema readerSchema,
+      GenericData modelData, DatumReaderCustomization customization) {
+    return new FastSerdeUtils.FastDeserializerWithAvroSpecificImpl<>(writerSchema, readerSchema,
+        (SpecificData)modelData, customization, false);
+  }
+
+  protected FastDeserializer<T> getRegularAvroImplWhenGenerationFail(Schema writerSchema, Schema readerSchema,
+      GenericData modelData, DatumReaderCustomization customization) {
+    return new FastSerdeUtils.FastDeserializerWithAvroSpecificImpl<>(writerSchema, readerSchema,
+        (SpecificData)modelData, customization, cache.isFailFast(), true);
   }
 }
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSpecificDatumWriter.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSpecificDatumWriter.java
index 1bab37e05..5259260f6 100644
--- a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSpecificDatumWriter.java
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/FastSpecificDatumWriter.java
@@ -1,5 +1,6 @@
 package com.linkedin.avro.fastserde;
 
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericData;
 import org.apache.avro.specific.SpecificData;
@@ -25,15 +26,26 @@ public FastSpecificDatumWriter(Schema schema, FastSerdeCache cache) {
   public FastSpecificDatumWriter(Schema schema, SpecificData modelData, FastSerdeCache cache) {
     super(schema, modelData, cache);
   }
+  public FastSpecificDatumWriter(Schema schema, SpecificData modelData, FastSerdeCache cache,
+      DatumWriterCustomization customization) {
+    super(schema, modelData, cache, customization);
+  }
 
   @SuppressWarnings("unchecked")
   @Override
-  protected FastSerializer<T> getFastSerializerFromCache(FastSerdeCache fastSerdeCache, Schema schema, GenericData specificData) {
-    return (FastSerializer<T>) fastSerdeCache.getFastSpecificSerializer(schema, (SpecificData) specificData);
+  protected FastSerializer<T> getFastSerializerFromCache(FastSerdeCache fastSerdeCache, Schema schema,
+      GenericData specificData, DatumWriterCustomization customization) {
+    return (FastSerializer<T>) fastSerdeCache.getFastSpecificSerializer(schema, (SpecificData) specificData, customization);
   }
 
   @Override
-  protected FastSerializer<T> getRegularAvroImpl(Schema schema, GenericData specificData) {
-    return new FastSerdeCache.FastSerializerWithAvroSpecificImpl<>(schema, (SpecificData) specificData);
+  protected FastSerializer<T> getRegularAvroImpl(Schema schema, GenericData specificData,
+      DatumWriterCustomization customization) {
+    return new FastSerdeUtils.FastSerializerWithAvroSpecificImpl<>(schema, (SpecificData) specificData, customization, false);
+  }
+
+  protected FastSerializer<T> getRegularAvroImplWhenGenerationFail(Schema schema, GenericData modelData,
+      DatumWriterCustomization customization) {
+    return new FastSerdeUtils.FastSerializerWithAvroSpecificImpl<>(schema, (SpecificData) modelData, customization, cache.isFailFast(), true);
   }
 }
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/customized/DatumReaderCustomization.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/customized/DatumReaderCustomization.java
new file mode 100644
index 000000000..befe06077
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/customized/DatumReaderCustomization.java
@@ -0,0 +1,59 @@
+package com.linkedin.avro.fastserde.customized;
+
+import java.util.HashMap;
+import java.util.Map;
+
+
+/**
+ * Customization for de-serialization.
+ * This class is expandable.
+ */
+public class DatumReaderCustomization {
+
+  public interface NewMapOverrideFunction {
+    Object apply(Object old, int size);
+  }
+
+  private NewMapOverrideFunction newMapOverrideFunc;
+
+
+  private DatumReaderCustomization(Builder builder) {
+    this.newMapOverrideFunc = builder.newMapOverrideFunc;
+  }
+
+  public NewMapOverrideFunction getNewMapOverrideFunc() {
+    return newMapOverrideFunc;
+  }
+
+  public static class Builder {
+    private NewMapOverrideFunction newMapOverrideFunc;
+
+    public Builder() {}
+
+    public Builder setNewMapOverrideFunc(NewMapOverrideFunction newMapOverrideFunc) {
+      this.newMapOverrideFunc = newMapOverrideFunc;
+      return this;
+    }
+
+    public DatumReaderCustomization build() {
+      return new DatumReaderCustomization(this);
+    }
+  }
+
+  public static final DatumReaderCustomization DEFAULT_DATUM_READER_CUSTOMIZATION = new DatumReaderCustomization.Builder()
+      .setNewMapOverrideFunc((old, size) -> {
+        Map retMap = null;
+        if (old instanceof Map) {
+          retMap = (Map)old;
+          retMap.clear();
+        } else {
+          /**
+           * Pure integer arithmetic equivalent of (int) Math.ceil(expectedSize / 0.75).
+           * The default load factor of HashMap is 0.75 and HashMap internally ensures size is always a power of two.
+           */
+          retMap = new HashMap<>((size * 4 + 2) / 3);
+        }
+        return retMap;
+      })
+      .build();
+}
diff --git a/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/customized/DatumWriterCustomization.java b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/customized/DatumWriterCustomization.java
new file mode 100644
index 000000000..0edd510c0
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/com/linkedin/avro/fastserde/customized/DatumWriterCustomization.java
@@ -0,0 +1,40 @@
+package com.linkedin.avro.fastserde.customized;
+
+/**
+ * Customization for serialization.
+ * This class is expandable.
+ */
+public class DatumWriterCustomization {
+  private CheckMapTypeFunction checkMapTypeFunction;
+
+  private DatumWriterCustomization(Builder builder) {
+    this.checkMapTypeFunction = builder.checkMapTypeFunction;
+  }
+
+  public CheckMapTypeFunction getCheckMapTypeFunction() {
+    return checkMapTypeFunction;
+  }
+
+  public interface CheckMapTypeFunction {
+    void apply(Object o);
+  }
+
+  public static class Builder {
+    private CheckMapTypeFunction checkMapTypeFunction;
+
+    public Builder() {}
+
+    public Builder setCheckMapTypeFunction(CheckMapTypeFunction checkMapTypeFunction) {
+      this.checkMapTypeFunction = checkMapTypeFunction;
+      return this;
+    }
+
+    public DatumWriterCustomization build() {
+      return new DatumWriterCustomization(this);
+    }
+  }
+
+  public static final DatumWriterCustomization DEFAULT_DATUM_WRITER_CUSTOMIZATION = new DatumWriterCustomization.Builder()
+      .setCheckMapTypeFunction( o -> {})
+      .build();
+}
diff --git a/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/ColdGenericDatumReader.java b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/ColdGenericDatumReader.java
index a71e1299c..15182ee7a 100644
--- a/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/ColdGenericDatumReader.java
+++ b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/ColdGenericDatumReader.java
@@ -12,7 +12,6 @@
  * This class needs to be in the org.apache.avro.generic package in order to access protected methods.
  */
 public class ColdGenericDatumReader<T> extends GenericDatumReader<T> implements ColdDatumReaderMixIn {
-
   public ColdGenericDatumReader(Schema writerSchema, Schema readerSchema, GenericData modelData) {
     super(writerSchema, readerSchema, modelData != null ? modelData : GenericData.get());
   }
diff --git a/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumReader.java b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumReader.java
new file mode 100644
index 000000000..8eb670a44
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumReader.java
@@ -0,0 +1,38 @@
+package org.apache.avro.generic;
+
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
+import org.apache.avro.Schema;
+
+/**
+ * This class will apply {@link DatumReaderCustomization} at runtime.
+ */
+public class CustomizedGenericDatumReader<T> extends GenericDatumReader<T> implements ColdDatumReaderMixIn {
+  private final DatumReaderCustomization customization;
+
+  public CustomizedGenericDatumReader(Schema writerSchema, Schema readerSchema, GenericData modelData, DatumReaderCustomization customization) {
+    super(writerSchema, readerSchema, modelData != null ? modelData : GenericData.get());
+    if (customization == null) {
+      throw new IllegalArgumentException("'customization' param should not null when constructing " +  this.getClass().getName());
+    }
+    this.customization = customization;
+  }
+
+  public CustomizedGenericDatumReader(Schema writerSchema, Schema readerSchema, DatumReaderCustomization customization) {
+    super(writerSchema, readerSchema);
+    if (customization == null) {
+      throw new IllegalArgumentException("'customization' param should not null when constructing " +  this.getClass().getName());
+    }
+    this.customization = customization;
+  }
+
+
+  @Override
+  protected Object newMap(Object old, int size) {
+    return customization.getNewMapOverrideFunc().apply(old, size);
+  }
+
+  @Override
+  protected Object newArray(Object old, int size, Schema schema) {
+    return newArray(old, size, schema, super::newArray);
+  }
+}
diff --git a/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumReaderForAvro14.java b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumReaderForAvro14.java
new file mode 100644
index 000000000..81bf5cffa
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumReaderForAvro14.java
@@ -0,0 +1,17 @@
+package org.apache.avro.generic;
+
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
+import org.apache.avro.Schema;
+
+
+/**
+ * In Avro-1.4, {@link org.apache.avro.generic.GenericDatumReader} doesn't have a constructor
+ * to take {@link org.apache.avro.generic.GenericData}.
+ */
+public class CustomizedGenericDatumReaderForAvro14<T> extends CustomizedGenericDatumReader<T> {
+
+  public CustomizedGenericDatumReaderForAvro14(Schema writerSchema, Schema readerSchema,
+      DatumReaderCustomization customization) {
+    super(writerSchema, readerSchema, customization);
+  }
+}
diff --git a/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumWriter.java b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumWriter.java
new file mode 100644
index 000000000..020050fe5
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedGenericDatumWriter.java
@@ -0,0 +1,30 @@
+package org.apache.avro.generic;
+
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
+import java.io.IOException;
+import org.apache.avro.Schema;
+import org.apache.avro.io.Encoder;
+
+
+/**
+ * This class will apply {@link DatumWriterCustomization} at runtime.
+ */
+public class CustomizedGenericDatumWriter<T> extends GenericDatumWriter<T> {
+
+  private final DatumWriterCustomization customization;
+
+  public CustomizedGenericDatumWriter(Schema schema, GenericData modelData, DatumWriterCustomization customization) {
+    super(schema, modelData);
+    if (customization == null) {
+      throw new IllegalArgumentException("'customization' param should not null when constructing " +  this.getClass().getName());
+    }
+
+    this.customization = customization;
+  }
+
+  @Override
+  protected void writeMap(Schema schema, Object datum, Encoder out) throws IOException {
+    customization.getCheckMapTypeFunction().apply(datum);
+    super.writeMap(schema, datum, out);
+  }
+}
diff --git a/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumReader.java b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumReader.java
new file mode 100644
index 000000000..6b2ea302e
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumReader.java
@@ -0,0 +1,39 @@
+package org.apache.avro.generic;
+
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
+import org.apache.avro.Schema;
+import org.apache.avro.specific.SpecificData;
+import org.apache.avro.specific.SpecificDatumReader;
+
+/**
+ * This class will apply {@link DatumReaderCustomization} at runtime.
+ */
+public class CustomizedSpecificDatumReader<T> extends SpecificDatumReader<T> implements ColdDatumReaderMixIn {
+  private final DatumReaderCustomization customization;
+
+  public CustomizedSpecificDatumReader(Schema writerSchema, Schema readerSchema, SpecificData modelData, DatumReaderCustomization customization) {
+    super(writerSchema, readerSchema, modelData != null ? modelData : SpecificData.get());
+    if (customization == null) {
+      throw new IllegalArgumentException("'customization' param should not null when constructing " +  this.getClass().getName());
+    }
+    this.customization = customization;
+  }
+
+  public CustomizedSpecificDatumReader(Schema writerSchema, Schema readerSchema, DatumReaderCustomization customization) {
+    super(writerSchema, readerSchema);
+    if (customization == null) {
+      throw new IllegalArgumentException("'customization' param should not null when constructing " +  this.getClass().getName());
+    }
+    this.customization = customization;
+  }
+
+  @Override
+  protected Object newMap(Object old, int size) {
+    return customization.getNewMapOverrideFunc().apply(old, size);
+  }
+
+  @Override
+  protected Object newArray(Object old, int size, Schema schema) {
+    return newArray(old, size, schema, super::newArray);
+  }
+}
diff --git a/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumReaderForAvro14.java b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumReaderForAvro14.java
new file mode 100644
index 000000000..2e8283fc7
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumReaderForAvro14.java
@@ -0,0 +1,15 @@
+package org.apache.avro.generic;
+
+import com.linkedin.avro.fastserde.customized.DatumReaderCustomization;
+import org.apache.avro.Schema;
+
+/**
+ * In Avro-1.4, {@link org.apache.avro.specific.SpecificDatumReader} doesn't have a constructor
+ * to take {@link org.apache.avro.specific.SpecificData}.
+ */
+public class CustomizedSpecificDatumReaderForAvro14<T> extends CustomizedSpecificDatumReader<T> {
+  public CustomizedSpecificDatumReaderForAvro14(Schema writerSchema, Schema readerSchema,
+      DatumReaderCustomization customization) {
+    super(writerSchema, readerSchema, customization);
+  }
+}
diff --git a/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumWriter.java b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumWriter.java
new file mode 100644
index 000000000..09b26e21c
--- /dev/null
+++ b/fastserde/avro-fastserde/src/main/java/org/apache/avro/generic/CustomizedSpecificDatumWriter.java
@@ -0,0 +1,30 @@
+package org.apache.avro.generic;
+
+import com.linkedin.avro.fastserde.customized.DatumWriterCustomization;
+import java.io.IOException;
+import org.apache.avro.Schema;
+import org.apache.avro.io.Encoder;
+import org.apache.avro.specific.SpecificData;
+import org.apache.avro.specific.SpecificDatumWriter;
+
+/**
+ * This class will apply {@link DatumWriterCustomization} at runtime.
+ * @param <T>
+ */
+public class CustomizedSpecificDatumWriter<T> extends SpecificDatumWriter<T> {
+  private final DatumWriterCustomization customization;
+
+  public CustomizedSpecificDatumWriter(Schema schema, SpecificData modelData, DatumWriterCustomization customization) {
+    super(schema, modelData);
+    if (customization == null) {
+      throw new IllegalArgumentException("'customization' param should not null when constructing " +  this.getClass().getName());
+    }
+    this.customization = customization;
+  }
+
+  @Override
+  protected void writeMap(Schema schema, Object datum, Encoder out) throws IOException {
+    customization.getCheckMapTypeFunction().apply(datum);
+    super.writeMap(schema, datum, out);
+  }
+}