dilipbiswal opened a new pull request #23750: [SPARK-19712] Pushing down Left Semi and Left Anti joins URL: https://github.com/apache/spark/pull/23750 ## What changes were proposed in this pull request? This PR adds support for pushing down LeftSemi and LeftAnti joins below operators such as Project, Aggregate, Window, Union etc. This is the initial piece of work that will be needed for the subsequent work of moving the subquery rewrites to the beginning of optimization phase. ## How was this patch tested? Added a new test suite LeftSemiAntiJoinPushDownSuite.
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