Github user yijieshen commented on the pull request:
https://github.com/apache/spark/pull/6938#issuecomment-114402580
Oh, I think there exists misunderstood of the `round` method and
`BigDecimalConverter`, `BDC` just as as a implicit type parameter of round to
infer the `round` first argument's type, for example Byte, call the
corresponding constructor of `BigDecimal` and use it's `setScale` method to
round, at last, `round` is using `fromBigDecimal` to convert the dataType back,
i.e. to Byte in our example.
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