cloud-fan commented on issue #26437: [SPARK-29800][SQL] Plan non-correlated Exists 's subquery in PlanSubqueries URL: https://github.com/apache/spark/pull/26437#issuecomment-570122171 We don't need to add `Project(Nil, ...)` because we convert to `WHERE (SELECT 1 FROM (subquery) LIMIT 1) IS NOT NULL`. It's always preferred to do logical transformation than adding a new physical node.
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