[Kernel-Spark] Refactor DeltaParquetFileFormatBase to support explicit useMetadataRowIndex control #5773
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…t useMetadataRowIndex control This PR refactors DeltaParquetFileFormatBase to allow the V2 connector to explicitly control whether to use Parquet's _metadata.row_index for deletion vector filtering. Changes: - Add useMetadataRowIndexOpt parameter to DeltaParquetFileFormatBase - Update DeltaParquetFileFormatV2 with new constructor accepting useMetadataRowIndex - V1 connector behavior unchanged (reads from config when None) This refactor enables: - Phase 1 (DV basic read): Pass false to disable file splitting - Phase 3 (DV with splitting): Pass true to use _metadata.row_index
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