refactor: read parquet in row group level. #12569
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sundy-li
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* Implemnt row group level reading for parquet reader. * Change parquet rs part to row group level. * Move specific part to specific mod. * Change parquet reading from stream to batch read. * Iceberg use parquet files part. * Suppot prewhere. * Fix. * Add progress record. * Fix stats collection.
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Summary
read_partitions. Make one row group as one partition. Store row group meta in the partition.InMemoryRowGroupto implement row group level reading.scan_progressto parquet source and iceberg source to support recording reading progress.ParquetPart::SmallFilestoParquetPart::Files. This kind of part can not only be used for small files.Parquet2RowGroupPartandParquetRSRowGroupPartto their own mods.NOTES: Iceberg still read in parquet file level.
Tracking in #12465
This change is