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https://issues.apache.org/jira/browse/SOLR-13391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16816289#comment-16816289
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ASF subversion and git services commented on SOLR-13391:
--------------------------------------------------------

Commit 4f6e78282f797dd327b8b154e742e92b77a2de09 in lucene-solr's branch 
refs/heads/branch_8x from Joel Bernstein
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=4f6e782 ]

SOLR-13391: Add variance and standard deviation stream evaluators
Squashed commit of the following:

commit 406d4b959a42e4830ac1c52836ccbcfc1b614b46
Author: Nazerke <seinaz1...@gmail.com>
Date:   Fri Apr 12 14:03:34 2019 +0200

    added missing package

commit 32c239687c39c5da3e4f2d0f25df73127331fa99
Author: Nazerke <seinaz1...@gmail.com>
Date:   Fri Apr 12 14:03:14 2019 +0200

    added package

commit 7b3f9bd415002969a4ec5d87a9ffbfd6fcff6e92
Author: Nazerke <seinaz1...@gmail.com>
Date:   Fri Apr 12 14:02:28 2019 +0200

    added var and stddev functions

commit 77c4f9fdd9f111862a55b645aad960457291414c
Author: Nazerke <seinaz1...@gmail.com>
Date:   Fri Apr 12 14:00:59 2019 +0200

    added test for the variance and standard deviation stream evaluators

commit 2d9692c178590b65e46cfd9e04ca0384c7d39ec5
Author: naz <nazerke.sei...@cloudera.com>
Date:   Wed Apr 10 19:50:30 2019 +0200

    added var and stddev new evaluators

commit d265225747bce9a0eabd713994ddd4990dbbbfa2
Author: naz <nazerke.sei...@cloudera.com>
Date:   Wed Apr 10 19:49:23 2019 +0200

    variance streaming evaluator

commit a3330064bb62b5723b9125334ef1d61fc3b098d3
Author: naz <nazerke.sei...@cloudera.com>
Date:   Wed Apr 10 19:49:02 2019 +0200

    standard deviation streaming evaluator


> Add variance and standard deviation stream evaluators
> -----------------------------------------------------
>
>                 Key: SOLR-13391
>                 URL: https://issues.apache.org/jira/browse/SOLR-13391
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: streaming expressions
>            Reporter: Nazerke Seidan
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> It seems variance and standard deviation stream evaluators are not supported 
> by any of the solr version. For example, 
>               let(echo="m,v,sd", arr=array(1,3,3), m=mean(a), v=var(a), 
> sd=stddev(a))
> So far, only the mean function is implemented. I think it is useful to have 
> var and sttdev functions separately as a stream evaluator. 



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