Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/12376#issuecomment-209810890
Interesting. While I'm well aware of Bankers' Rounding and the
inconsistent implementations of rounding in various SQL engines, I hadn't run
into the bround() function before. Searching now, I find that it is also in
SQL Server, but it looks to me like this is another bit of rounding
functionality that is not standardized across SQL implementations. Do you know
any different?
While having more than one rounding strategy available within Spark SQL can
be important for interoperating with other systems, I'm not sure if we have
decided to always follow HQL, particularly as Spark SQL becomes less directly
dependent on Hive in Spark 2.0. @marmbrus ?
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