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From "Xu Mingmin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-2612) support variance builtin aggregation function
Date Thu, 13 Jul 2017 17:32:00 GMT

    [ https://issues.apache.org/jira/browse/BEAM-2612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16086059#comment-16086059
] 

Xu Mingmin commented on BEAM-2612:
----------------------------------

cool, you can refer to https://github.com/apache/beam/blob/DSL_SQL/dsls/sql/src/main/java/org/apache/beam/dsls/sql/transform/BeamBuiltinAggregations.java
as examples.

> 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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