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Posted to issues@flink.apache.org by "Fabian Hueske (JIRA)" <ji...@apache.org> on 2016/01/18 10:08:39 UTC

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

     [ https://issues.apache.org/jira/browse/FLINK-1903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fabian Hueske reassigned FLINK-1903:
------------------------------------

    Assignee: Fabian Hueske

> 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
>            Assignee: Fabian Hueske
>            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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