Support OPTIMIZE on Delta tables with DVs #1578
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This PR is part of the feature: Support reading Delta tables with deletion vectors (more details at delta-io#1485) This PR adds support for running OPTIMIZE (file compaction or Z-Order By) on Delta tables with deletion vectors. It changes the following: * Selection criteria * File compaction: earlier we used to select files with size below `optimize.minFileSize` for compaction. Now we also consider the ratio of rows deleted in a file. If the deleted rows ratio is above `optimize.maxDeletedRowsRatio` (default 0.05), then it is also selected for compaction (which removes the DVs) * Z-Order: This hasn't been changed. We always select all the files in the selected partitions, so if a file has DV it gets removed as part of the Z-order by * Reading selected files with DV for OPTIMIZE: We go through the same read path as Delta table read which removes the deleted rows (according to the DV) from the scan output. * Metrics for deleted DVs Added tests. GitOrigin-RevId: b64d8beec8278e6665813642753ef0a19af5c985
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This PR is part of the feature: Support reading Delta tables with deletion vectors (more details at #1485)
This PR adds support for running OPTIMIZE (file compaction or Z-Order By) on Delta tables with deletion vectors. It changes the following:
optimize.minFileSizefor compaction. Now we also consider the ratio of rows deleted in a file. If the deleted rows ratio is aboveoptimize.maxDeletedRowsRatio(default 0.05), then it is also selected for compaction (which removes the DVs)Added tests.
GitOrigin-RevId: b64d8beec8278e6665813642753ef0a19af5c985
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Does this PR introduce any user-facing changes?