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Posted to issues@flink.apache.org by "Anton Mushin (JIRA)" <ji...@apache.org> on 2016/09/30 11:09:20 UTC

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

    [ https://issues.apache.org/jira/browse/FLINK-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15535709#comment-15535709 ] 

Anton Mushin commented on FLINK-4604:
-------------------------------------

Hello.
Could I start to resolve this ticket? 


> 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
>
> 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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