Github user davies commented on the pull request:
https://github.com/apache/spark/pull/10029#issuecomment-171184876
@viirya One question is that: we are moving to do more codegen staff (whole
stage codegen), but the ImperativeAggregate can't support that, not sure will
we do another codegen version for this or not. Right now, ImperativeAggregate
version faster, because the generated code is still not the best, but we can
improve.
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