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https://issues.apache.org/jira/browse/SOLR-13391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16817118#comment-16817118
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ASF subversion and git services commented on SOLR-13391:
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Commit 58001bfc870a6f5f04cc200853df7ffe04473866 in lucene-solr's branch
refs/heads/jira/LUCENE-8738 from Joel Bernstein
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=58001bf ]
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
> Fix For: 8.1
>
> Time Spent: 2h 20m
> 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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