Review Request 29995: Fix of not working distinct select for PojoDataContext (and proabably others, too)

[welz . fabian]

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Review request for MetaModel.


Bugs: METAMODEL-78
    https://issues.apache.org/jira/browse/METAMODEL-78


Repository: metamodel


Description
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Proposed fix for issue METAMODEL-78


Diffs
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  core/src/main/java/org/apache/metamodel/QueryPostprocessDataContext.java 
ab2dd71 
  pojo/src/test/java/org/apache/metamodel/pojo/PojoDataContextTest.java e345a8c 

Diff: https://reviews.apache.org/r/29995/diff/


Testing
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Added two tests to scenario in PojoDataContextTest-Unittest


Thanks,

fwelz