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From "Anton Mushin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4604) Add support for standard deviation/variance
Date Fri, 28 Oct 2016 12:52:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15615302#comment-15615302
] 

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

For correct calculate standard deviation/variance function need
 impliment support sqrt/power function for all data types.  

> 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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