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### What changes were proposed in this pull request? This is a follow-up to https://github.com/apache/spark/pull/29572. LeftAnti SortMergeJoin should not buffer all matching right side rows when bound condition is empty, this is unnecessary and can lead to performance degradation especially when spilling happens. ### Why are the changes needed? Performance improvement. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? New UT. Closes #29727 from peter-toth/SPARK-32730-improve-leftsemi-sortmergejoin-followup. Authored-by: Peter Toth <peter.toth@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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