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https://issues.apache.org/jira/browse/BEAM-2612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16088875#comment-16088875
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ASF GitHub Bot commented on BEAM-2612:
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GitHub user vectorijk opened a pull request:
https://github.com/apache/beam/pull/3568
[BEAM-2612] variance builtin aggregation functions
implement var_pop, var_samp builtin aggregation functions
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vectorijk/beam beam-2612-variance
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/3568.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3568
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commit ff9cb47f6ac03cdbf2aed233f0c6045b719bf643
Author: Kai Jiang <[email protected]>
Date: 2017-07-16T10:25:32Z
var_pop, var_samp builtin aggreagtion functions
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> 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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