Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/8231#issuecomment-136875509
`_aggOrdering` works, but thats not terribly interesting to test. After my
PR there is likely a different alias that will cause problems. Either way, an
optimal solution would add a field to `Attribute` that prevents it from being
resolved by name. We can set this to true in artificially created aliases.
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