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https://issues.apache.org/jira/browse/SOLR-13391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17159593#comment-17159593
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ASF subversion and git services commented on SOLR-13391:
--------------------------------------------------------

Commit 5e7f6420215770e52afe7a58d218dd1e4ed2e3ab in lucene-solr's branch 
refs/heads/branch_8x from Ishan Chattopadhyaya
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=5e7f642 ]

SOLR-13391: Removing unused imports


> Add variance and standard deviation stream evaluators
> -----------------------------------------------------
>
>                 Key: SOLR-13391
>                 URL: https://issues.apache.org/jira/browse/SOLR-13391
>             Project: Solr
>          Issue Type: Improvement
>          Components: streaming expressions
>            Reporter: Nazerke Seidan
>            Assignee: Joel Bernstein
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 8.1
>
>          Time Spent: 3h 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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