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From: fhueske <git@git.apache.org>
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References: <git-pr-1981-flink@git.apache.org>
In-Reply-To: <git-pr-1981-flink@git.apache.org>
Subject: [GitHub] flink pull request: [Flink-2971][table] Add outer joins to the Tab...
Content-Type: text/plain
Message-Id: <20160526163954.27B23DFF73@git1-us-west.apache.org>
Date: Thu, 26 May 2016 16:39:54 +0000 (UTC)
archived-at: Thu, 26 May 2016 16:39:58 -0000

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1981#discussion_r64778861
  
    --- 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.")
    +      }
    +
    +    var equiJoinFound = false
    +    def validateConditions(exp: Expression, isAndBranch: Boolean): Unit = exp match {
    +      case x: And => x.children.foreach(validateConditions(_, isAndBranch))
    +      case x: Or => x.children.foreach(validateConditions(_, isAndBranch = false))
    +      case x: EqualTo =>
    +        if (isAndBranch) {
    +          equiJoinFound = true
    +        }
    +        checkIfJoinCondition(x)
    +      case x: BinaryComparison => checkIfJoinCondition(x)
    +      case x => failValidation(s"Unsupported condition type: ${x.getClass.getSimpleName}.")
    +    }
    +
    +    validateConditions(expression, isAndBranch = true)
    +    if (!equiJoinFound) {
    +      failValidation(s"At least one equi-join required.")
    --- End diff --
    
    Add the whole join predicate to the error message?


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