Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6723#discussion_r32084143
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/decimalFunctions.scala
---
@@ -28,6 +29,15 @@ case class UnscaledValue(child: Expression) extends
UnaryExpression {
override def nullable: Boolean = child.nullable
override def toString: String = s"UnscaledValue($child)"
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (child.dataType.isInstanceOf[DecimalType]) {
+ TypeCheckResult.TypeCheckSuccess
+ } else {
+ TypeCheckResult.TypeCheckFailure(
+ s"UnscaledValue only accept decimal type, not ${child.dataType}")
--- End diff --
This thing is only added by the optimizer so I guess it is not that big of
a deal to do this check... can you add an inline comment for this expression
saying this is internal and created only by the optimizer?
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