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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2991) Extend Window Operators to Allow Efficient Fold Operation
Date Tue, 09 Feb 2016 23:03:18 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15139965#comment-15139965
] 

ASF GitHub Bot commented on FLINK-2991:
---------------------------------------

Github user rmetzger commented on the pull request:

    https://github.com/apache/flink/pull/1605#issuecomment-182125713
  
    You are adding new `.apply()` variants to the API which are not documented with the PR.


> Extend Window Operators to Allow Efficient Fold Operation
> ---------------------------------------------------------
>
>                 Key: FLINK-2991
>                 URL: https://issues.apache.org/jira/browse/FLINK-2991
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>
> Right now, a window fold is implemented as a WindowFunction that gets all the elements
as input. No pre-aggregation is performed. The window operator should be extended to also
allow the fold to also be pre-aggregated.
> This requires changing the signature of the {{WindowBuffer}} so that it can emit a type
other than the input type. 



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