Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/9038#issuecomment-147611336
I'm fairly concerned about the implications of having mutable state inside
of ImperativeAggregates which isn't reset when switching to sort / could be
shared across stages of a pipeline, so I'm slightly worried about the idea of
reverting back to 8695e3f and merging this PR as of then: it seems like the
same underlying problems could exist there, too.
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