[SPARK-51256][SQL] Increase parallelism if joining with small bucket table #50004
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Increase parallelism if joining with small bucket table
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What changes were proposed in this pull request?
This pull request enhances the logic in
EnsureRequirementsto improve the performance of query execution.Changes:
Split
candidateSpecsintocandidateSpecsWithShuffleandcandidateSpecsWithoutShuffle.Calculate the maximum number of partitions in
candidateSpecsWithShuffle.Refine the selection criteria for
finalCandidateSpecsto consider the maximum number of partitions and the configured maximum bucket ratio.Why are the changes needed?
Improve query performance.
Before this PR:
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Unit test.
Was this patch authored or co-authored using generative AI tooling?
No.