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Posted to commits@beam.apache.org by "Kai Jiang (JIRA)" <ji...@apache.org> on 2017/07/13 08:15:00 UTC

[jira] [Commented] (BEAM-2612) support variance builtin aggregation function

    [ https://issues.apache.org/jira/browse/BEAM-2612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085345#comment-16085345 ] 

Kai Jiang commented on BEAM-2612:
---------------------------------

I have been working on this ticket. I will open a PR very soon.

> support variance builtin aggregation function
> ---------------------------------------------
>
>                 Key: BEAM-2612
>                 URL: https://issues.apache.org/jira/browse/BEAM-2612
>             Project: Beam
>          Issue Type: New Feature
>          Components: dsl-sql
>            Reporter: Kai Jiang
>            Assignee: Kai Jiang
>
> two builtin aggregate functions
> VAR_POP
> the population variance (square of the population standard deviation)
> VAR_SAMP
> the sample variance (square of the sample standard deviation)
> https://calcite.apache.org/docs/reference.html#aggregate-functions



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