Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/7957#issuecomment-128192529
Hi @marmbrus , we strip `UnresolvedAlias` from aggregation and projection
at
[Analyzer](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala#L140),
which works well for SQL. It will be good to make this rule more general but
I'm afaid that will be hard to write. So I think fixing the different behavior
between DataFrame and SQL is also reasonable, i.e. making `DataFrame.resolve`
return resolved expressions.
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