Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/16012#discussion_r89656679
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
---
@@ -356,10 +356,17 @@ case class PrettyAttribute(
* A place holder used to hold a reference that has been resolved to a
field outside of the current
* plan. This is used for correlated subqueries.
*/
-case class OuterReference(e: NamedExpression) extends LeafExpression with
Unevaluable {
+case class OuterReference(e: NamedExpression)(
+ val exprId: ExprId = NamedExpression.newExprId)
--- End diff --
Is it okay? I thought it works like 'Alias'. Anyway, no problem. I'll
update like that.
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