Github user davies commented on the pull request:
https://github.com/apache/spark/pull/10228#issuecomment-163759063
@hvanhovell The difficulty of doing this in DistinctAggregateRewriter is
that DistinctAggregateRewriter will generate two logical plan, but some
aggregation functions have different updateExpression and mergeExpression, so
will could not work as update-merge-update-final, they should work as
update-merge-merge-final.
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