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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4604) Add support for standard deviation/variance
Date Fri, 28 Oct 2016 15:33:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15615730#comment-15615730

Fabian Hueske commented on FLINK-4604:

Hi [~anmu], thanks for digging into this.

Regarding the sqrt/power function, I guess you are aware of FLINK-4743 and PR [#2686|https://github.com/apache/flink/pull/2686].
So this issue should be fixed rather soon. In case this is blocking you, I'd rebase your code
on top of the PR branch. We can later remove these commits once the original PR got merged.

Regarding the {{Type NULL}} issue, are you still working on the branch you posted previously
in this thread: [BRANCH|https://github.com/ex00/flink/compare/master...ex00:FLINK-4604]? I
assume you get the exception when running one of tests, right?
I will have a look and try to figure out what is going wrong there.

> 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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