francis0407 commented on issue #24344: [SPARK-27440][SQL] Optimize uncorrelated predicate subquery URL: https://github.com/apache/spark/pull/24344#issuecomment-485061390 I add several unit tests for both single-column IN subquery and multi-column IN subquery. I didn't test `NOT IN` because it should behave as `NOT (x IN (subquery))`. Also, I optimize `InSubquery` in the rule `RewriteUncorrelatedSubquery`, pushing the left values into the subquery. cc @cloud-fan, @viirya
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