jchen5 commented on code in PR #39375:
URL: https://github.com/apache/spark/pull/39375#discussion_r1067355121
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/DecorrelateInnerQuery.scala:
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@@ -667,6 +720,24 @@ object DecorrelateInnerQuery extends PredicateHelper {
val newJoin = j.copy(left = newLeft, right = newRight, condition =
newCondition)
(newJoin, newJoinCond, newOuterReferenceMap)
+ case u: Union =>
+ // First collect outer references from all children
+ val collectedChildOuterReferences =
collectOuterReferencesInPlanTree(u)
Review Comment:
It's described with an example in the linked doc
https://docs.google.com/document/d/11b9ClCF2jYGU7vU2suOT7LRswYkg6tZ8_6xJbvxfh2I/edit#
- does that answer your question? I'll add the info to the comments as well.
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