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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3254) CombineFunction interface not respected
Date Mon, 01 Feb 2016 16:38:39 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15126515#comment-15126515
] 

ASF GitHub Bot commented on FLINK-3254:
---------------------------------------

Github user fhueske commented on the pull request:

    https://github.com/apache/flink/pull/1568#issuecomment-178060233
  
    Good to merge. Thanks!


> CombineFunction interface not respected
> ---------------------------------------
>
>                 Key: FLINK-3254
>                 URL: https://issues.apache.org/jira/browse/FLINK-3254
>             Project: Flink
>          Issue Type: Bug
>          Components: DataSet API
>    Affects Versions: 1.0.0, 0.10.1
>            Reporter: Fabian Hueske
>            Assignee: Kostas
>            Priority: Blocker
>             Fix For: 1.0.0
>
>
> The DataSet API offers a {{CombineFunction}} interface, which differs from the {{GroupCombineFunction}}
interface by being restricted to return a single value instead of returning arbitrary many
values through a {{Collector}}.
> The JavaDocs of the {{GroupCombineFunction}} point to the {{CombineFunction}} interface,
advertising it as more efficient.
> However, the {{CombineFunction}} interface is nor respected by Flink, i.e., a {{GroupReduceFunction}}
that implements this interface is executed without leveraging the combine method.



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