Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/6173#issuecomment-103179196
@chenghao-intel, a single method seems easier to maintain then full Map/Set
implementations. I'll add that its not clear to me the use in patterns is
actually invalid. You can compare expression with equality when you are only
trying to find the exact same expression.
I'm merging this to master and 1.4. I'll improve the wording of the scala
doc while merging.
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