Nazerke Seidan created SOLR-13391:
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Summary: 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
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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