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