[jira] [Commented] (FLINK-4604) Add support for standard deviation/variance

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851394#comment-15851394 ] 

ASF GitHub Bot commented on FLINK-4604:
---------------------------------------

GitHub user ex00 opened a pull request:

    https://github.com/apache/flink/pull/3260

    [FLINK-4604] Add support for standard deviation/variance

    add rule for reduce standard deviation/variance functions
    
    Thanks for contributing to Apache Flink. Before you open your pull request, please take the following check list into consideration.
    If your changes take all of the items into account, feel free to open your pull request. For more information and/or questions please refer to the [How To Contribute guide](http://flink.apache.org/how-to-contribute.html).
    In addition to going through the list, please provide a meaningful description of your changes.
    
    - [x] General
      - The pull request references the related JIRA issue ("[FLINK-XXX] Jira title text")
      - The pull request addresses only one issue
      - Each commit in the PR has a meaningful commit message (including the JIRA id)
    
    - [x] Documentation
      - Documentation has been added for new functionality
      - Old documentation affected by the pull request has been updated
      - JavaDoc for public methods has been added
    
    - [x] Tests & Build
      - Functionality added by the pull request is covered by tests
      - `mvn clean verify` has been executed successfully locally or a Travis build has passed


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/ex00/flink FLINK-4604

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/3260.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 #3260
    
----
commit 38d99c4c6ccc8e8b1dbd2f83d9cef4eae3494f00
Author: Anton Mushin <an...@epam.com>
Date:   2017-02-03T10:06:49Z

    [FLINK-4604] Add support for standard deviation/variance
    
    add rule for reduce standard deviation/variance functions

----


> Add support for standard deviation/variance
> -------------------------------------------
>
>                 Key: FLINK-4604
>                 URL: https://issues.apache.org/jira/browse/FLINK-4604
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Anton Mushin
>         Attachments: 1.jpg
>
>
> Calcite's {{AggregateReduceFunctionsRule}} can convert SQL {{AVG, STDDEV_POP, STDDEV_SAMP, VAR_POP, VAR_SAMP}} to sum/count functions. We should add, test and document this rule. 
> If we also want to add this aggregates to Table API is up for discussion.



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