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https://issues.apache.org/jira/browse/FLINK-2871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15097063#comment-15097063
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ASF GitHub Bot commented on FLINK-2871:
---------------------------------------

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

    https://github.com/apache/flink/pull/1469#discussion_r49655995
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/operators/hash/MutableHashTable.java
 ---
    @@ -420,15 +440,23 @@ public MutableHashTable(TypeSerializer<BT> 
buildSideSerializer, TypeSerializer<P
        //                              Life-Cycle
        // 
------------------------------------------------------------------------
        
    +   public void open(final MutableObjectIterator<BT> buildSide, final 
MutableObjectIterator<PT> probeSide)
    --- End diff --
    
    Please copy the JavaDocs of the other `open` method.


> Add OuterJoin strategy with HashTable on outer side
> ---------------------------------------------------
>
>                 Key: FLINK-2871
>                 URL: https://issues.apache.org/jira/browse/FLINK-2871
>             Project: Flink
>          Issue Type: New Feature
>          Components: Local Runtime, Optimizer
>    Affects Versions: 0.10.0
>            Reporter: Fabian Hueske
>            Assignee: Chengxiang Li
>            Priority: Minor
>
> Outer joins are currently supported with two local execution strategies:
> - sort-merge join
> - hash join where the hash table is built on the inner side. Hence, this 
> strategy is only supported for left and right outer joins.
> In order to support hash-tables on the outer side, we need a special hash 
> table implementation that gives access to all records which have not been 
> accessed during the probe phase.



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