Github user dilipbiswal commented on a diff in the pull request:
https://github.com/apache/spark/pull/17330#discussion_r110693397
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
---
@@ -59,6 +58,13 @@ abstract class SubqueryExpression(
children.zip(p.children).forall(p => p._1.semanticEquals(p._2))
case _ => false
}
+ def canonicalize(attrs: AttributeSeq): SubqueryExpression = {
+ // Normalize the outer references in the subquery plan.
+ val subPlan = plan.transformAllExpressions {
+ case OuterReference(r) => QueryPlan.normalizeExprId(r, attrs)
--- End diff --
@cloud-fan Actually you r right. Preserving the OuterReference would be
good.
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