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https://issues.apache.org/jira/browse/FLINK-1450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14359069#comment-14359069
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ASF GitHub Bot commented on FLINK-1450:
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GitHub user akshaydixi opened a pull request:
https://github.com/apache/flink/pull/481
[FLINK-1450] Added fold operator for the Streaming API
Tried to follow the steps described in the JIRA Issue comments:
- Created a FoldFunction and a RichFoldFunction
- Created a StreamFoldInvokable
- Integrated it to the DataStream for both Java and Scala
- Implemented StreamFoldTest based on StreamReduceTest
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/akshaydixi/flink FLINK-1450
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/481.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 #481
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commit 9848f23a0a73228fb45346d69aee68091b135d3d
Author: Akshay Dixit <[email protected]>
Date: 2015-03-12T17:49:31Z
[FLINK-1450] Added fold operator for the Streaming API
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> Add Fold operator to the Streaming api
> --------------------------------------
>
> Key: FLINK-1450
> URL: https://issues.apache.org/jira/browse/FLINK-1450
> Project: Flink
> Issue Type: New Feature
> Components: Streaming
> Affects Versions: 0.9
> Reporter: Gyula Fora
> Priority: Minor
> Labels: starter
>
> The streaming API currently doesn't support a fold operator.
> This operator would work as the foldLeft method in Scala. This would allow
> effective implementations in a lot of cases where a the simple reduce is
> inappropriate due to different return types.
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