[Spark] Add support for sorting within partitions when Z-ordering #4006
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Signed-off-by: Malte Velin <[email protected]>
…value. Signed-off-by: Malte Velin <[email protected]>
…ording to curve. Signed-off-by: Malte Velin <[email protected]>
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Which Delta project/connector is this regarding?
Description
Resolves #4000 by introducing a new configuration property
spark.databricks.io.skipping.mdc.sortWithinPartitionsthat clusters records in row groups, within Parquet files, based on Z-order or Hilbert curve values. This improves data skipping on the Parquet level. Benchmarks included in the issue demonstrate speedups of approximately 8× and 11× on two different datasets. Please refer to the issue for more details.How was this patch tested?
Added test cases in
MultiDimClusteringSuite.scalafor Hilbert and Z-order curves.Does this PR introduce any user-facing changes?
Yes. This PR introduces a new configuration property
spark.databricks.io.skipping.mdc.sortWithinPartitions. The property defaults tofalse, ensuring that existing users remain unaffected unless they opt-in by setting it totrue.Previous Behavior
Z-ordering did not sort data within partitions.
New Behavior
When the property is enabled,
sortWithinPartitionsis applied afterrepartitionByRangeinMultiDimClustering.scala.