cloud-fan commented on code in PR #40865:
URL: https://github.com/apache/spark/pull/40865#discussion_r1176203863
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala:
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@@ -599,10 +600,33 @@ object RewriteCorrelatedScalarSubquery extends
Rule[LogicalPlan] with AliasHelpe
if (Utils.isTesting) {
assert(mayHaveCountBug.isDefined)
}
+
+ def queryOutputFoldable(list: Seq[NamedExpression]): Boolean = {
+ trimAliases(list.filter(p =>
p.exprId.equals(query.output.head.exprId)).head).foldable
+ }
+
+ lazy val resultFoldable = {
Review Comment:
We need more comments here. Why is foldable result a special case that we
need to take care here?
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