Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1750#discussion_r15911755
--- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala ---
@@ -935,6 +936,7 @@ private[hive] object HiveQl {
case Token(DIV(), left :: right:: Nil) =>
Cast(Divide(nodeToExpr(left), nodeToExpr(right)), LongType)
case Token("%", left :: right:: Nil) => Remainder(nodeToExpr(left),
nodeToExpr(right))
+ case Token("TOK_FUNCTION", Token(SQRT(), Nil) :: arg :: Nil) =>
Sqrt(nodeToExpr(arg))
--- End diff --
I'd block other reimplimentations until we know how to do type coersion as
they are going to cause regressions over current behavior. Regarding the
type-coersion, it would be great to discuss the interface you are thinking of
before you get too far into implementation as I think this is a pretty complex
problem.
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