Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1958#discussion_r63206959
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/expressions/comparison.scala
---
@@ -74,6 +109,8 @@ case class IsNull(child: Expression) extends
UnaryExpression {
override def toRexNode(implicit relBuilder: RelBuilder): RexNode = {
relBuilder.isNull(child.toRexNode)
}
+
+ override def resultType = BOOLEAN_TYPE_INFO
--- End diff --
Oh yes, sure. You're right. I did not expand the code (Github had folded
some lines) I thought this belonged to `GreaterThan`.
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