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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4832) Count/Sum 0 elements
Date Mon, 21 Nov 2016 12:08:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15683420#comment-15683420
] 

ASF GitHub Bot commented on FLINK-4832:
---------------------------------------

GitHub user ex00 opened a pull request:

    https://github.com/apache/flink/pull/2840

    [FLINK-4832] Count/Sum 0 elements

    Hello.
    Currently, if `AggregateDataSet` is empty then we unable to count or sum up 0 elements.

    These changes allows to get correct result of aggregate function through dummy row union
with the  `AggregateDataSet`.

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

    $ git pull https://github.com/ex00/flink FLINK-4832

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

    https://github.com/apache/flink/pull/2840.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 #2840
    
----
commit 62f5fd6a0f6f808126d079353b1f1d9976ccac35
Author: Anton Mushin <anton_mushin@epam.com>
Date:   2016-11-21T11:49:41Z

    [FLINK-4832] Count/Sum 0 elements
    
    aggregateDataSet union with dataSet is contains dummy records for correct to calculate
aggregate functions if source aggregateDataSet is empty

----


> Count/Sum 0 elements
> --------------------
>
>                 Key: FLINK-4832
>                 URL: https://issues.apache.org/jira/browse/FLINK-4832
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Anton Mushin
>
> Currently, the Table API is unable to count or sum up 0 elements. We should improve DataSet
aggregations for this. Maybe by union the original DataSet with a dummy record or by using
a MapPartition function. Coming up with a good design for this is also part of this issue.



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