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-558460184 @AngersZhuuuu after some more thoughts, I think we can still reuse non-correlated scalar subquery. We can rewrite `WHERE EXISTS (subquery)` to `WHERE (SELECT 1 FROM (subquery) LIMIT 1) IS NOT NULL`. What do you think?
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