Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1750#discussion_r15740705
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
---
@@ -33,6 +33,19 @@ case class UnaryMinus(child: Expression) extends
UnaryExpression {
}
}
+case class Sqrt(child: Expression) extends UnaryExpression {
+ type EvaluatedType = Double
+
+ def dataType = child.dataType
+ override def foldable = child.foldable
+ def nullable = child.nullable
+ override def toString = s"SQRT($child)"
+
+ override def eval(input: Row): Double = {
+ math.sqrt(n1(child, input, _.toDouble(_)).asInstanceOf[Double])
--- End diff --
Hi, I'm wondering this will return `null` for `null`.
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