Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6938#discussion_r33108630
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -312,3 +315,90 @@ case class Logarithm(left: Expression, right:
Expression)
"""
}
}
+
+case class Round(child: Expression, scale: Expression) extends Expression {
+
+ def this(child: Expression) = {
+ this(child, Literal(0))
+ }
+
+ def children: Seq[Expression] = Seq(child, scale)
+
+ def nullable: Boolean = true
--- End diff --
The `nullable` will be great useful in the expression optimization, we'd
better handle it properly.
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