Set file_size attribute directly from file metadata (#576)

Datafusion PartitionedFile struct relies on correct file url and 
file size. This file size is used for calculating offset for reading 
the parquet footer. Wrong file size can lead to query issues.

This PR aims to fix that issue. Fixes #575

server/src/catalog/manifest.rs

@@ -97,6 +97,8 @@ pub fn create_from_parquet_file(
     };
 
     let file = std::fs::File::open(fs_file_path)?;
+    manifest_file.file_size = file.metadata()?.len();
+
     let file = parquet::file::serialized_reader::SerializedFileReader::new(file)?;
     let file_meta = file.metadata().file_metadata();
     let row_groups = file.metadata().row_groups();
@@ -105,9 +107,6 @@ pub fn create_from_parquet_file(
     manifest_file.ingestion_size = row_groups
         .iter()
         .fold(0, |acc, x| acc + x.total_byte_size() as u64);
-    manifest_file.file_size = row_groups
-        .iter()
-        .fold(0, |acc, x| acc + x.compressed_size() as u64);
 
     let columns = column_statistics(row_groups);
     manifest_file.columns = columns.into_values().collect();