Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/8494#discussion_r38265509
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
---
@@ -155,6 +155,8 @@ case class Alias(child: Expression, name: String)(
explicitMetadata == a.explicitMetadata
case _ => false
}
+
+ def cleanExprId(): Alias = Alias(child, name)(ExprId(-1), qualifiers)
--- End diff --
Why does this have `()`? It also needs scala doc. However, since its only
ever used once, I'd consider just inlining it.
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