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https://issues.apache.org/jira/browse/BEAM-2612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144567#comment-16144567
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ASF GitHub Bot commented on BEAM-2612:
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GitHub user vectorijk reopened 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 8fbb9006dd479b42a0798fe1c1eaf0e509649bc2
Author: Kai Jiang <jiang...@gmail.com>
Date: 2017-08-16T23:13:26Z
var_pop and var_samp
two builtin aggregation functions
commit 53612b5f9e256248212c5d743ea5410a8eeffd5f
Author: Kai Jiang <jiang...@gmail.com>
Date: 2017-08-17T00:26:04Z
fix checkstyle
commit 1256f63b2686c0e7d1d0c2a5863945cff9c79fea
Author: Kai Jiang <jiang...@gmail.com>
Date: 2017-08-28T20:06:36Z
address comments
change type of sum in class VarAgg to BigDecimal
move isSamp field to Var
rename VarPop -> Var to make more generic
move logic to prepareOutput() both for Avg and Var
set MathContext to handle potential exception with BigDecimal divide.
commit 27b84cb4702e9d8960d1bfc5b59e48d8e5f446dd
Author: Kai Jiang <jiang...@gmail.com>
Date: 2017-08-28T20:13:38Z
newlines
commit 7db3f490aeeb34f01b9064e274feacacbfa67092
Author: Kai Jiang <jiang...@gmail.com>
Date: 2017-08-28T20:18:09Z
Merge branch 'DSL_SQL' into beam-2612-variance
commit fb0b05c163f6de2760c13af05abd9b41d9b57de9
Author: Kai Jiang <jiang...@gmail.com>
Date: 2017-08-28T23:36:47Z
rebase issue
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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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