[jira] [Commented] (FLINK-703) Use complete element as join key.

["Fabian Hueske (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313163#comment-14313163 ] 

Fabian Hueske commented on FLINK-703:
-------------------------------------

I propose wildcard field expressions ( {{"*"}} and {{"_"}} ) to define full elements (of any type) as join, group, or cogroup keys (see "Define keys using Field Expressions" section in the [programming guide|https://github.com/apache/flink/blob/master/docs/programming_guide.md].

> Use complete element as join key.
> ---------------------------------
>
>                 Key: FLINK-703
>                 URL: https://issues.apache.org/jira/browse/FLINK-703
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: GitHub Import
>            Assignee: Chiwan Park
>            Priority: Trivial
>              Labels: github-import
>             Fix For: pre-apache
>
>
> In some situations such as semi-joins it could make sense to use a complete element as join key. 
> Currently this can be done using a key-selector function, but we could offer a shortcut for that.
> This is not an urgent issue, but might be helpful.
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/703
> Created by: [fhueske|https://github.com/fhueske]
> Labels: enhancement, java api, user satisfaction, 
> Milestone: Release 0.6 (unplanned)
> Created at: Thu Apr 17 23:40:00 CEST 2014
> State: open



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