Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/10228#issuecomment-164251993
@yhuai I think having the two clearly separated paths (this PR) is an
improvement of the current situation. I also admit that I am responsible for
introducing the second path. Your comment on having four aggregate steps
without the exhange triggered me, and I was thinking out loud on how we could
do this using the rewriting rule (the removal of one of the paths would have
been a bonus).
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