Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/11673#issuecomment-197792870
hi @marmbrus , yes your idea makes sense, we should use `Alias` to produce
new attributes if we can. Except leaf nodes, there are some special cases we
still need to use `producedAttributes`: `Generate`, `Expand`, `ScriptTransform`
and aggregate related operators. In this PR, I made `EvaluatePython` to use
alias for new attribute, and clean up those special cases to use
`producedAttributes`.
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