[jira] [Closed] (FLINK-3254) CombineFunction interface not respected

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

     [ https://issues.apache.org/jira/browse/FLINK-3254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fabian Hueske closed FLINK-3254.
--------------------------------
    Resolution: Fixed

Fixed with aabb2688a3f4b69a95a87c773a4fe86c76b8ef0f

> 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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