Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/6836#issuecomment-112471585
I don't believe this is quite right, since `setScale` in BigDecimal will
handle negative values differently than SQL `ROUND(column_name, decimals)` will
handle a negative value of `decimals` -- every SQL engine that I'm familiar
with will treat negative `decimals` as if were 0.
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