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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4832) Count/Sum 0 elements
Date Mon, 24 Oct 2016 13:19:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15601955#comment-15601955
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Aljoscha Krettek commented on FLINK-4832:
-----------------------------------------

Counting {{0}} elements using a union with a dummy would only be possible on a global aggregation,
not on a keyed aggregation. For the keyed aggregation you would have to insert a dummy for
every key but what is "every key".

> 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
>
> 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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