Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/spark/pull/12719#issuecomment-217679449
Since `CleanupAliases` already handles all the corner cases safely,
`FoldablePropagate` optimizer becomes now amazingly simple with one rule:
`AttributeReference` -> `Alias`. I updated like the followings.
* Register `CleanupAliases` into `Optimizer` stage. (Before this, it was
used in Analyze stage only)
* Register `CleanupAliases` into testsuites, too.
* Remove all the other complex replacing rules from `FoldablePropagate`.
Now, only `Union` and `Command` queries are unoptimized queries.
Thank you so much for advising `CleanupAliases` together, @cloud-fan !
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