Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/10228#issuecomment-163699118
We could move the planning of a distinct queries entirely to the
DistinctAggregateRewriter. This would require us to merge the non-distinct
aggregate paths and the first distinct group aggregate path, so we could avoid
the expand in case of a single disinct column group.
This is quite a bit of work; I don't know if this is worth the effort.
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