Add ParquetFileMerger for efficient row-group level file merging #14324
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## Why this change?
This implementation provides significant performance improvements for Parquet
file merging operations by eliminating serialization/deserialization overhead.
Benchmark results show **13x faster** file merging compared to traditional
read-rewrite approaches.
The change leverages existing Parquet library capabilities (ParquetFileWriter
appendFile API) to perform zero-copy row-group merging, making it ideal for
compaction and maintenance operations on large Iceberg tables.
Encrypted tables are not supported yet.
## What changed?
- Added ParquetFileMerger class for row-group level file merging
- Performs zero-copy merging using ParquetFileWriter.appendFile()
- Validates schema compatibility across all input files
- Supports merging multiple Parquet files into a single output file
- Reuses existing Apache Parquet library functionality instead of custom implementation
- Strict schema validation ensures data integrity during merge operations
- Added comprehensive error handling for schema mismatches
## Testing
- Validated in staging test environment
- Verified schema compatibility checks work correctly
- Confirmed 13x performance improvement over traditional approach
- Tested with various file sizes and row group configurations
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Why this change?
This implementation provides significant performance improvements for Parquet
file merging operations by eliminating serialization/deserialization overhead.
Benchmark results show 13x faster file merging compared to traditional
read-rewrite approaches.
The change leverages existing Parquet library capabilities (ParquetFileWriter
appendFile API) to perform zero-copy row-group merging, making it ideal for
compaction and maintenance operations on large Iceberg tables.
Encrypted tables are not supported yet.
What changed?
Testing