Github user willb commented on the pull request: https://github.com/apache/spark/pull/1750#issuecomment-53753423 @marmbrus I've rebased this atop the current master and added support for casting string-valued SQRT arguments to double and a test case in SQLQuerySuite for the same. (These will be unnecessary when I finish general support for string coercion in numeric functions, but they make this patch mergeable now.)
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