Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/5134#issuecomment-96968051
I don't think it's the correct way for this optimization. `Aggregate` takes
the `output` of `Expand` for expression evaluation, not the `projections`!
It probably need to refactor the `GroupingSet` a little bit before this
optimization, I will submit soon.
Sorry @viirya , I will ping you once the refactoring finished.
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