Github user navis commented on a diff in the pull request:
https://github.com/apache/spark/pull/8456#discussion_r42953994
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -148,7 +148,7 @@ class Analyzer(
child match {
case _: UnresolvedAttribute => u
case ne: NamedExpression => ne
- case g: Generator if g.resolved && g.elementTypes.size > 1 =>
MultiAlias(g, Nil)
--- End diff --
Now generator provides default alias for output column, we should ask it in
any case.
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