Github user aray commented on the issue:
https://github.com/apache/spark/pull/18697
@viirya We could certainly make that improvement. I believe it would be a
fairly trivial change to this PR if we were just considering expressions that
have the same canonical representation. However for reasons that are not clear
to me an alias does not automatically have the same canonical representation as
the `exprId` is not copied
(https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/Column.scala#L984).
Can anyone enlighten me as to why this is the case?
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