Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/8298#issuecomment-134620114
@adrian-wang the improvement is absolutely tiny, about 2-3% if you do a lot
of ```min```'s of ```max```'es.
This PR was a response to misdiagnosed performance regression, the real
cause was the use of a map in key-less aggregation. The PR adds some value, we
could add it to 1.6. @yhuai / @adrian-wang if you feel differently about this,
I'll withdraw the PR.
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