Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/6938#issuecomment-114399183
Yes, #6836 follows the Hive's `GenericUDFRound`, but we should keep the
output / input to `o.a.s.s.types.Decimal`, not `BigDecimal` (if it's a
`DecimalType`), otherwise it will causes problem when interact with other Spark
SQL expression. See
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/CatalystTypeConverters.scala#L291
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