Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/10896#issuecomment-182169168
I probably will not be able to take a close look on this PR until later
this month. I have a question regarding the approach of PR. Right now, we
always plan partial aggregation operators first (in SparkStrategies) and then
add Exchange operators (in EnsureRequirements). Another approach will be that
we do not add partial aggregation operators in SparkStrategies. Then, after we
figure out where we need exchange operators, we add partial aggregation
operators. This approach probably needs more code changes. But, I feel it is a
more cleaner approach.
@maropu @marmbrus what do you think?
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