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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (FLINK-925) Support KeySelector function returning Tuples
Date Mon, 08 Sep 2014 14:30:28 GMT

     [ https://issues.apache.org/jira/browse/FLINK-925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Fabian Hueske resolved FLINK-925.
    Resolution: Fixed

Fixed by 122c9b023cc5f9fcd5cb4914bd90afde0b3c6fc0


> Support KeySelector function returning Tuples
> ---------------------------------------------
>                 Key: FLINK-925
>                 URL: https://issues.apache.org/jira/browse/FLINK-925
>             Project: Flink
>          Issue Type: Improvement
>    Affects Versions: 0.6-incubating
>            Reporter: Fabian Hueske
>            Assignee: Tobias
>            Priority: Minor
>              Labels: starter
> KeySelector functions are used to extract keys on which DataSets can be grouped or joined.
> Currently, the keys types returned by KeySelector function are restricted to be comparable.
However, Flinks Tuple data types are not comparable (because this depends on the types of
its fields) which makes grouping and joining on composite keys difficult.
> We should change the signature of the groupBy(), join(), and coGroup() methods to allow
also non-comparable keys as return types of a KeySelector function. 
> Instead we will check at optimization time whether the returned type is comparable (which
is true for tuples if all elements are comparable).

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