[BugFix] fix partial update column name sensitive issue

fe/fe-core/src/main/java/com/starrocks/load/Load.java

@@ -664,7 +664,9 @@ public static void initColumns(Table tbl, List<ImportColumnDesc> columnExprs,
 
     public static List<Column> getPartialUpateColumns(Table tbl, List<ImportColumnDesc> columnExprs,
              List<Boolean> missAutoIncrementColumn) throws StarRocksException {
-        Set<String> specified = columnExprs.stream().map(desc -> desc.getColumnName()).collect(Collectors.toSet());
+        Set<String> specified = columnExprs.stream()
+                .map(desc -> desc.getColumnName())
+                .collect(Collectors.toCollection(() -> Sets.newTreeSet(String.CASE_INSENSITIVE_ORDER)));
         List<Column> ret = new ArrayList<>();
         for (Column col : tbl.getBaseSchema()) {
             if (specified.contains(col.getName())) {

test/common/data/stream_load/test_partial_update_case_sensitive.csv

@@ -0,0 +1 @@
+1,"xx"

test/sql/test_stream_load/R/test_partial_update_case_sensitive

@@ -0,0 +1,51 @@
+-- name: test_partial_update_case_sensitive
+create database test_partial_update_case_sensitive;
+-- result:
+-- !result
+use test_partial_update_case_sensitive;
+-- result:
+-- !result
+CREATE TABLE test1 (
+  `id` bigint(20) NOT NULL COMMENT "",
+  `name` char(16) NULL DEFAULT "" COMMENT "",
+  `city` char(16) NULL DEFAULT "" COMMENT "",
+  `age` char(24) NULL DEFAULT "" COMMENT ""
+) ENGINE=OLAP
+PRIMARY KEY(`id`)
+DISTRIBUTED BY HASH(`id`)
+PROPERTIES (
+"replication_num" = "1",
+"in_memory" = "false",
+"storage_format" = "DEFAULT",
+"enable_persistent_index" = "true",
+"compression" = "LZ4"
+);
+-- result:
+-- !result
+insert into test_partial_update_case_sensitive.test1 values(1,'name1','SD',5),(2,'name2','SH',25),(3,'name3','BJ',50);
+-- result:
+-- !result
+shell: curl --location-trusted -u root: -X PUT -H "Expect:100-continue"  -H "format: csv" -H "partial_update: true" -H "columns: ID, city" -H column_separator:, -T ${root_path}/lib/../common/data/stream_load/test_partial_update_case_sensitive.csv ${url}/api/test_partial_update_case_sensitive/test1/_stream_load
+-- result:
+0
+{
+    "Status": "Success",
+    "Message": "OK"
+}
+-- !result
+sync;
+-- result:
+-- !result
+select * from test_partial_update_case_sensitive.test1;
+-- result:
+2	name2	SH	25
+1	name1	"xx"	5
+3	name3	BJ	50
+-- !result
+select * from test_partial_update_case_sensitive.test1 where name = "name1";
+-- result:
+1	name1	"xx"	5
+-- !result
+drop database test_partial_update_case_sensitive force;
+-- result:
+-- !result

test/sql/test_stream_load/T/test_partial_update_case_sensitive

@@ -0,0 +1,27 @@
+-- name: test_partial_update_case_sensitive
+create database test_partial_update_case_sensitive;
+use test_partial_update_case_sensitive;
+CREATE TABLE test1 (
+  `id` bigint(20) NOT NULL COMMENT "",
+  `name` char(16) NULL DEFAULT "" COMMENT "",
+  `city` char(16) NULL DEFAULT "" COMMENT "",
+  `age` char(24) NULL DEFAULT "" COMMENT ""
+) ENGINE=OLAP
+PRIMARY KEY(`id`)
+DISTRIBUTED BY HASH(`id`)
+PROPERTIES (
+"replication_num" = "1",
+"in_memory" = "false",
+"storage_format" = "DEFAULT",
+"enable_persistent_index" = "true",
+"compression" = "LZ4"
+);
+
+insert into test_partial_update_case_sensitive.test1 values(1,'name1','SD',5),(2,'name2','SH',25),(3,'name3','BJ',50);
+shell: curl --location-trusted -u root: -X PUT -H "Expect:100-continue"  -H "format: csv" -H "partial_update: true" -H "columns: ID, city" -H column_separator:, -T ${root_path}/lib/../common/data/stream_load/test_partial_update_case_sensitive.csv ${url}/api/test_partial_update_case_sensitive/test1/_stream_load
+sync;
+
+select * from test_partial_update_case_sensitive.test1;
+select * from test_partial_update_case_sensitive.test1 where name = "name1";
+
+drop database test_partial_update_case_sensitive force;