Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/5134#issuecomment-96974757
I mean `projections.map{ groupExpr.collect` is not necessary, as `output`
will be exactly match the `projections`.
Since we will pruning the `output` anyway, why don't just remove the
associated columns from `projections` directly?
Specifying the `output` for a logical node is actually quit confusing, as
catalyst will take it as `referenced` attribute also, that's why we need to
refactor it.
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