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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2871) Add OuterJoin strategy with HashTable on outer side
Date Wed, 13 Jan 2016 21:52:39 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15097068#comment-15097068
] 

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_r49656407
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/operators/hash/MutableHashTable.java
---
    @@ -1558,7 +1641,209 @@ public void reset() {
     		}
     
     	} // end HashBucketIterator
    +	
    +	/**
    +	 * Iterate all the elements in memory which has not been probed during probe phase.
    +	 */
    +	public static class UnmatchedBuildIterator<BT, PT> implements MutableObjectIterator<BT>
{
    --- End diff --
    
    A few more inline comments would be good for this class.


> 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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