flink-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request: [Flink-2971][table] Add outer joins to the Tab...
Date Thu, 26 May 2016 15:03:51 GMT
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.


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---

Mime
View raw message