[jira] [Resolved] (SOLR-13391) Add variance and standard deviation stream evaluators

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[jira] [Resolved] (SOLR-13391) Add variance and standard deviation stream evaluators

JIRA jira@apache.org

     [ https://issues.apache.org/jira/browse/SOLR-13391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joel Bernstein resolved SOLR-13391.
-----------------------------------
       Resolution: Resolved
    Fix Version/s: 8.1

> 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: 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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