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https://issues.apache.org/jira/browse/FLINK-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14908131#comment-14908131
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ASF GitHub Bot commented on FLINK-2576:
---------------------------------------

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

    https://github.com/apache/flink/pull/1138#discussion_r40440502
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/api/common/operators/base/JoinOperatorBase.java
 ---
    @@ -47,99 +45,29 @@
     /**
      * @see org.apache.flink.api.common.functions.FlatJoinFunction
      */
    -public class JoinOperatorBase<IN1, IN2, OUT, FT extends 
FlatJoinFunction<IN1, IN2, OUT>> extends DualInputOperator<IN1, IN2, OUT, FT> {
    -   
    -   /**
    -    * An enumeration of hints, optionally usable to tell the system how 
exactly execute the join.
    -    */
    -   public static enum JoinHint {
    --- End diff --
    
    Moving the `JoinHint` enum breaks the public API. Join hints are quite 
often used and I would prefer to keep them at the same location.
    What do you think about renaming *your* `AbstractJoinOperatorBase` class to 
`JoinOperatorBase` and *your* `JoinOperatorBase` class to 
`InnerJoinOperatorBase`?
    Alternatively, we can also move the `JoinHint` enum from 
`AbstractJoinOperatorBase` to `JoinOperatorBase`.


> Add outer joins to API and Optimizer
> ------------------------------------
>
>                 Key: FLINK-2576
>                 URL: https://issues.apache.org/jira/browse/FLINK-2576
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Java API, Optimizer, Scala API
>            Reporter: Ricky Pogalz
>            Priority: Minor
>             Fix For: pre-apache
>
>
> Add left/right/full outer join methods to the DataSet APIs (Java, Scala) and 
> to the optimizer of Flink.
> Initially, the execution strategy should be a sort-merge outer join 
> (FLINK-2105) but can later be extended to hash joins for left/right outer 
> joins.



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