GitHub user fhueske opened a pull request:

    https://github.com/apache/flink/pull/2508

    [FLINK-2662] [dataSet] Translate union with multiple output into separate 
unions with single output.

    Fixes FLINK-2662 by translating Union operators with two (or more) 
successors into two or more Union operators with a single successor.
    
    In the optimizer union operators with two (or more) successors caused 
problems, when these successors had different partitioning requirements and 
some of these successors were other Union operators. In certain situations, the 
UnionMerging post pass would fail because of a non-forward shipping strategy 
between two subsequent union operators.
    
    This fix does only adapt the program translation and does not change the 
API.

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

    $ git pull https://github.com/fhueske/flink FLINK-2662

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

    https://github.com/apache/flink/pull/2508.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 #2508
    
----
commit 8d91e9d0074884ac430c88c4f6ad41878a8d1dff
Author: Fabian Hueske <fhue...@apache.org>
Date:   2016-09-16T16:40:32Z

    [FLINK-2662] [dataSet] Translate union with multiple output into separate 
unions with single output.

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