jchen5 commented on code in PR #42383:
URL: https://github.com/apache/spark/pull/42383#discussion_r1300507642
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/DecorrelateInnerQuery.scala:
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@@ -654,6 +654,25 @@ object DecorrelateInnerQuery extends PredicateHelper {
val newProject = Project(newProjectList ++ referencesToAdd,
newChild)
(newProject, joinCond, outerReferenceMap)
+ case w@Window(projectList, partitionSpec, orderSpec, child) =>
+ val outerReferences = collectOuterReferences(w.expressions)
+ assert(outerReferences.isEmpty, s"Correlated column is not allowed
in window " +
+ s"function: $w")
+ val newOuterReferences = parentOuterReferences ++ outerReferences
+ val (newChild, joinCond, outerReferenceMap) =
+ decorrelate(child, newOuterReferences, aggregated = true,
underSetOp)
Review Comment:
Yeah, I agree we need the logic of setting aggregated=true and that's fine.
It's needed for correctness around outer ref substitution. And window funcs are
doing something similar to aggregation, so I think it's ok as long as there's a
comment.
You're right that this test case wouldn't work, how about the same thing but
with a lateral join?
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