Github user willb commented on the pull request:
https://github.com/apache/spark/pull/1750#issuecomment-51012136
@marmbrus I've added a test in ExpressionEvaluationSuite and can push that
whenever. As far as type goes, the code only produces double-precision results,
but I could certainly approximate the square root of an arbitrary-precision
decimal if that makes sense to do. (Hive 0.12 only handles double-precision
square roots AFAICT.)
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