agubichev commented on code in PR #42383:
URL: https://github.com/apache/spark/pull/42383#discussion_r1300509442
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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)
+ val newProjectList = replaceOuterReferences(projectList,
outerReferenceMap)
+ val newPartitionSpec = replaceOuterReferences(partitionSpec,
outerReferenceMap)
+ val newOrderSpec = replaceOuterReferences(orderSpec,
outerReferenceMap)
+ val referencesToAdd = missingReferences(
+ newPartitionSpec.asInstanceOf[Seq[NamedExpression]],
Review Comment:
if the window function has no correlated params, then the diff between
joinCond.attributes and projectList should be just joinCond.attributes, right?
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