Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6836#discussion_r32594967
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -255,3 +257,39 @@ case class Pow(left: Expression, right: Expression)
"""
}
}
+
+case class Round(left: Expression, right: Expression)
--- End diff --
We can simply override the `def left` and `def right` methods. The `left`
or `right` here is meaningless for `Round`.
However, the biggest concern here is, seems the `Round` in Hive only accept
the constant value for `scala`, which mean the `Round` is a `UnaryExpression`,
and the second argument will be just `Int`.
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