cloud-fan commented on issue #26437: [SPARK-29800][SQL] Plan Exists 's subquery in PlanSubqueries URL: https://github.com/apache/spark/pull/26437#issuecomment-552343943 makes sense, let's keep the new EXISTS expression. Can we add a `Project(Nil, ...)` on the top to do column pruning? this should be critical for performance.
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