Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/8231#issuecomment-136917439
Hi @marmbrus @andrewor14 , I have updated the description and title of this
PR, to explain what was the problem before and why it disappeared. Is this LGTY?
@marmbrus , I think we don't need to add a field to `Attribute` anymore as
now we only reference pushed down aggregate expressions by exprId, not by name.
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