[jira] [Commented] (FLINK-2107) Implement Hash Outer Join algorithm

["Fabian Hueske (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959060#comment-14959060 ] 

Fabian Hueske commented on FLINK-2107:
--------------------------------------

Hi @chiwan, is it OK if I take over some parts of this issue?
I would like to get the "simple" hash outer join case into the next release because it would allow me to remove one limitation from the Cascading on Flink adapter.
This would be the case where the the left or right outer side is the probe side of the hash table.

Thanks, Fabian


> Implement Hash Outer Join algorithm
> -----------------------------------
>
>                 Key: FLINK-2107
>                 URL: https://issues.apache.org/jira/browse/FLINK-2107
>             Project: Flink
>          Issue Type: New Feature
>          Components: Local Runtime
>            Reporter: Fabian Hueske
>            Assignee: Chiwan Park
>            Priority: Minor
>             Fix For: pre-apache
>
>
> Flink does not natively support outer joins at the moment.
> This issue proposes to implement a hash outer join algorithm that can cover left and right outer joins.
> The implementation can be based on the regular hash join iterators (for example `ReusingBuildFirstHashMatchIterator` and `NonReusingBuildFirstHashMatchIterator`, see also `MatchDriver` class)
> The Reusing and NonReusing variants differ in whether object instances are reused or new objects are created. I would start with the NonReusing variant which is safer from a user's point of view and should also be easier to implement.



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