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https://issues.apache.org/jira/browse/FLINK-758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14031996#comment-14031996
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ASF GitHub Bot commented on FLINK-758:
--------------------------------------
GitHub user uce opened a pull request:
https://github.com/apache/incubator-flink/pull/20
[FLINK-758] Add initial value to GenericReduce and adjust AllReduceDriver
This is an initial version of introducing an initial value to the reduce
functions. Thanks to @fhueske for suggesting to add the initial value to
`GenericReduce`.
It is only implemented for `AllReduce` (ungrouped reduce). Please give
feedback. If everything is OK, I would continue (~ 1 hr) with the remaining
reduce variants (grouped reduce, ungrouped groupreduce, and grouped
groupreduce).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/uce/incubator-flink FLINK-758
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-flink/pull/20.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 #20
----
commit 9ef87ff169f602ad41f61192c2872bfadaaa94d9
Author: uce <[email protected]>
Date: 2014-06-15T18:24:17Z
[FLINK-758] Add initial value to GenericReduce and adjust AllReduceDriver
(first shot at reduce with initial value)
----
> Add count method to DataSet and implement CountOperator
> -------------------------------------------------------
>
> Key: FLINK-758
> URL: https://issues.apache.org/jira/browse/FLINK-758
> Project: Flink
> Issue Type: Improvement
> Reporter: GitHub Import
> Labels: github-import
> Fix For: pre-apache
>
> Attachments: pull-request-758-7518001488867571817.patch
>
>
> At the request of @twalthr. This is the count operator I've implemented some
> time ago to get the to know the new Java API. It introduces
> `DataSet.count()`, which is executed as a map (to ones) and reduce (sum up
> the ones). I initially didn't do the PR, because of the following problem:
> empty DataSets don't work as the first map won't have any input to operate on.
> If more people think that we should include this operator we can think about
> a possible solution to the problem.
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/pull/758
> Created by: [uce|https://github.com/uce]
> Labels: enhancement, java api,
> Milestone: Release 0.6 (unplanned)
> Created at: Tue May 06 10:42:33 CEST 2014
> State: open
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