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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-758) Add count method to DataSet and implement CountOperator
Date Fri, 31 Oct 2014 10:55:34 GMT

     [ https://issues.apache.org/jira/browse/FLINK-758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Fabian Hueske updated FLINK-758:
    Affects Version/s: 0.7.0-incubating

> Add count method to DataSet and implement CountOperator
> -------------------------------------------------------
>                 Key: FLINK-758
>                 URL: https://issues.apache.org/jira/browse/FLINK-758
>             Project: Flink
>          Issue Type: New Feature
>          Components: Java API, Scala API
>    Affects Versions: 0.7.0-incubating
>            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
> 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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