Github user yijieshen commented on the pull request:
https://github.com/apache/spark/pull/6938#issuecomment-114394060
@chenghao-intel, I think the main difference between this and #6836 is
whether to make `Round` act as `GenericUDFRound`, if we want to support
`udf_round` and `udf_round_3`.
I suppose following Hive's semantic is a good choice.
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