[jira] [Created] (FLINK-1903) Joins where one side uses a field more than once don't work

[Aljoscha Krettek (JIRA)]

Aljoscha Krettek created FLINK-1903:
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             Summary: Joins where one side uses a field more than once don't 
work
                 Key: FLINK-1903
                 URL: https://issues.apache.org/jira/browse/FLINK-1903
             Project: Flink
          Issue Type: Improvement
            Reporter: Aljoscha Krettek
            Priority: Minor


For example, a join on fields (0, 0) and (0, 1) does not work because 
Keys.rangeCheckFields() eliminates duplicates in the keys. 

This behaviour is never necessary because it can be computed more efficiently 
by a filter that checks whether these two fields are the same before the join. 
We could, however, still allow it.



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