Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/9993#issuecomment-159878354
I think it's hard to tell which one is more expensive, an extra project or
an extra udf evaluation? Maybe we shoud let user to decide it, use `udf((x:
Int) => x + 1). nondeterministic`, which is introduced in
https://github.com/apache/spark/pull/9393
cc @marmbrus @yhuai
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