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https://issues.apache.org/jira/browse/FLINK-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15137209#comment-15137209
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ASF GitHub Bot commented on FLINK-2991:
---------------------------------------
GitHub user aljoscha opened a pull request:
https://github.com/apache/flink/pull/1605
[FLINK-2991] Add Folding State and use in WindowOperator
This enables efficient incremental aggregation of fold window.
This also adds:
- WindowedStream.apply(initVal, foldFunction, windowFunction)
- AllWindowedStream.apply(initVal, foldFunction, windowFunction)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aljoscha/flink window-fold
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1605.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1605
----
commit f81df7039455eb1ae4834490a79aa6577635eda4
Author: Aljoscha Krettek <[email protected]>
Date: 2016-02-08T13:56:19Z
[FLINK-2991] Add Folding State and use in WindowOperator
This enables efficient incremental aggregation of fold window.
This also adds:
- WindowedStream.apply(initVal, foldFunction, windowFunction)
- AllWindowedStream.apply(initVal, foldFunction, windowFunction)
----
> 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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