Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1981#discussion_r64778778
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/logical/operators.scala
---
@@ -298,11 +338,40 @@ case class Join(
val resolvedJoin = super.validate(tableEnv).asInstanceOf[Join]
if (!resolvedJoin.condition.forall(_.resultType == BOOLEAN_TYPE_INFO))
{
failValidation(s"filter expression ${resolvedJoin.condition} is not
a boolean")
- } else if (!ambiguousName.isEmpty) {
+ } else if (ambiguousName.nonEmpty) {
failValidation(s"join relations with ambiguous names:
${ambiguousName.mkString(", ")}")
}
+
+ resolvedJoin.condition.foreach(testJoinCondition(_))
resolvedJoin
}
+
+ private def testJoinCondition(expression: Expression): Unit = {
+ def checkIfJoinCondition(exp : BinaryComparison) = exp.children match {
+ case (x : JoinFieldReference) :: (y : JoinFieldReference) :: Nil
+ if x.isFromLeftInput != y.isFromLeftInput => Unit
+ case _ => failValidation(
+ s"Only join predicates supported. For non-join predicates use
Table#where.")
--- End diff --
Add the condition that causes the failure to the error message.
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