francis0407 commented on issue #24344: [SPARK-27440][SQL] Optimize uncorrelated predicate subquery URL: https://github.com/apache/spark/pull/24344#issuecomment-483302729 > how about (a, b) in (select c, d ...)? How do we convert it? > If there is no other SQL system doing it, maybe it's simpler to create the phyiscal plan for non-correlated IN? It is similar to the correlated one, converted as `EXISTS(select c, d from ... where a = c and b = d)`. If a physical plan for IN is satisfying, I'm ok to do that.
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