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