Github user dilipbiswal commented on the pull request:
https://github.com/apache/spark/pull/11521#issuecomment-192512951
@marmbrus Just pasting the short description we have in the code.
// we don't want the gOutput to be taken as part of the expressions
// as that will cause exceptions like unresolved attributes etc.
override def expressions: Seq[Expression] = generator :: Nil
I was trying to comment out this and seeing if i can reproduce the
unresolved attribute problem. So far haven't been successful :-)
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