Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/10228#issuecomment-164284205
@hvanhovell Yea, it's great to think about how to use a single rule to
handle aggregation queries with distinct after we have this improvement. The
logical rewriter rules probably is a good place because rewriting logical plans
is easier. If it is the right approach, we can make some changes to our
physical planner to make it respect the aggregation mode of an agg expression
in a logical agg operator (right now, our physical planner always ignore the
mode). So, when we create physical plan, we can understand that, for example, a
logical agg operator is used to merge aggregation buffers.
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