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https://issues.apache.org/jira/browse/FLINK-1263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14220253#comment-14220253
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ASF GitHub Bot commented on FLINK-1263:
---------------------------------------

GitHub user StephanEwen opened a pull request:

    https://github.com/apache/incubator-flink/pull/223

    [FLINK-1263] [optimizer] Implement compatibility checks for binary 
operators and custom partitioning

    This enhances the optimizer to reuse custom partitionings (created via 
groupinga and partition operations) in joins, if the same custom partitioning 
is used on both input data sets.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/StephanEwen/incubator-flink binarycustom

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-flink/pull/223.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 #223
    
----
commit 2ffd90bce5b1de9d6f5b8038ddcbd7c543f10f7e
Author: Stephan Ewen <[email protected]>
Date:   2014-11-20T14:25:21Z

    [APIs] Enhance test coverage for CollectionInputFormat and add tests for 
failed serializations of user code objects

commit 69a54ebb759e44cca52b0065bdb2aab621cbc30e
Author: Stephan Ewen <[email protected]>
Date:   2014-11-20T15:09:40Z

    [FLINK-1263] [optimizer] Implement compatibility checks for binary 
operators and custom partitioning

----


> Manual Partition operations are considered to keep data types constant
> ----------------------------------------------------------------------
>
>                 Key: FLINK-1263
>                 URL: https://issues.apache.org/jira/browse/FLINK-1263
>             Project: Flink
>          Issue Type: Bug
>          Components: Java API, Optimizer, Scala API
>    Affects Versions: 0.8-incubating
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>             Fix For: 0.8-incubating
>
>
> This leads to a big loss in optimization potential and fully voids some cases.



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