Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15857
Could we add a comment above
[`Union`](https://github.com/hvanhovell/spark/blob/d98f8f930330b368fbeade07d435197b0cdd2228/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala#L440)
to explain why `Except` and `Intersect` are not handled?
You know, my first reaction is why only handling `Union`? How about
`Except` and `Intersect`? Then, I realize they have been replaced before this
rule. That means, the order of these rules matters. : )
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