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https://issues.apache.org/jira/browse/FLINK-2107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14960424#comment-14960424
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ASF GitHub Bot commented on FLINK-2107:
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GitHub user fhueske opened a pull request:
https://github.com/apache/flink/pull/1262
[FLINK-2107] Add hash-based strategies for left and right outer joins.
This PR adds hash-based execution strategies for left and right outer
joins, that have the outer side as the probe side of a hash table.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/fhueske/flink outerJoinHash
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1262.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1262
----
commit e24f487112694e1cd757601f5ad59037c0312499
Author: Fabian Hueske <[email protected]>
Date: 2015-10-15T08:58:58Z
[FLINK-2107] Add hash-based strategies for left and right outer joins.
----
> 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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