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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request #3673: [FLINK-5256] Extend DataSetSingleRowJoin to suppor...
Date Thu, 27 Apr 2017 10:49:53 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3673#discussion_r113497136
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/dataSet/DataSetSingleRowJoinRule.scala
---
    @@ -37,10 +37,10 @@ class DataSetSingleRowJoinRule
       override def matches(call: RelOptRuleCall): Boolean = {
         val join = call.rel(0).asInstanceOf[FlinkLogicalJoin]
     
    -    if (isInnerJoin(join)) {
    -      isSingleRow(join.getRight) || isSingleRow(join.getLeft)
    -    } else {
    -      false
    +    join.getJoinType match {
    +      case JoinRelType.INNER | JoinRelType.LEFT | JoinRelType.RIGHT =>
    --- End diff --
    
    We can only support this for outer joins if the single-row input is on the inner side
of the join. 
    If the single row is on the outer side, we would need check that it does not join with
any of the inner side before we send out a result with `null` fields. Since the single row
is broadcasted / replicated, it is not possible to check this.
    
    Hence, the condition should be:
    ```
      case JoinRelType.INNER if isSingleRow(join.getLeft) || isSingleRow(join.getRight) =>
true
      case JoinRelType.LEFT if isSingleRow(join.getRight) => true
      case JoinRelType.RIGHT if isSingleRow(join.getLeft) => true
      case _ => false
    ```



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