cloud-fan commented on a change in pull request #29585:
URL: https://github.com/apache/spark/pull/29585#discussion_r490701918
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
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@@ -458,7 +463,10 @@ object RewriteCorrelatedScalarSubquery extends
Rule[LogicalPlan] {
sys.error(s"Unexpected operator in scalar subquery: $lp")
}
- val resultMap = evalPlan(plan)
+ val resultMap = evalPlan(plan).mapValues { _.transform {
+ case a: Alias => a.newInstance() // Assigns a new `ExprId`
Review comment:
I don't quite understand this change. Will it break parent nodes that
refer to this alias?
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