Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/13087#issuecomment-220651359
I think we can have a way to mark a UDF as non-deterministic, but that is
too large of a change to make it the default.
Also, is this an actual performance problem, or does it just look like one
(and common subexpression elimination is fixing it)?
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