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From "Nazerke Seidan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-13391) Add variance and standard deviation stream evaluators
Date Wed, 10 Apr 2019 18:13:00 GMT
Nazerke Seidan created SOLR-13391:
-------------------------------------

             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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