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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-1903) Joins where one side uses a field more than once don't work
Date Fri, 17 Apr 2015 07:45:59 GMT
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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