Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/10016#issuecomment-160139585
@sun-rui Thanks for your comments. You can get the issue from the [source
code](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L563)
and this PR(#9930).
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