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https://issues.apache.org/jira/browse/FLINK-1903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499615#comment-14499615
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Fabian Hueske commented on FLINK-1903:
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+1 for removing the duplicate removal.
I guess this was added with duplicate grouping keys in mind but breaks join and
coGroup key pairs.
> 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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