Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1981#discussion_r64762144
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/logical/operators.scala
---
@@ -342,21 +368,29 @@ case class Join(
}
private def testJoinCondition(expression: Expression): Unit = {
- def checkIfJoinCondition(exp : Expression) = if
(exp.children.exists(!_.isInstanceOf[JoinFieldReference])) {
- failValidation(s"Only join predicates supported. For non-join
predicates use Table#where.")
- }
+ def checkIfJoinCondition(exp : BinaryComparison) =
+ if (exp.children match {
+ case (x : JoinFieldReference) :: (y : JoinFieldReference) :: Nil
=>
+ x.belongsToLeft == y.belongsToLeft
+ case _ => true
+ }) {
+ failValidation(s"Only join predicates supported. For non-join
predicates use Table#where.")
+ }
var equiJoinFound = false
- def validateConditions(exp: Expression) : Unit = exp match {
- case x: And => x.children.foreach(validateConditions(_))
+ def validateConditions(exp: Expression, isAndBranch: Boolean): Unit =
exp match {
--- End diff --
I'm sorry but this check does not catch all cases. For example, it would
let `l.a = r.b OR (l.c = r.d && l.e = r.f)` pass.
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