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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