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https://issues.apache.org/jira/browse/SOLR-10682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16009311#comment-16009311
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Joel Bernstein commented on SOLR-10682:
---------------------------------------

Yeah, we do need to put some thought into the function names when they overlap 
with facet aggregations. Either they need to be different or we'll need a math 
path package for Stream Evaluators. For example the variance Stream Evaluator 
could be called: math.variance.

But keeping the Stream Evaluator function names short may be more important 
then making them the same as facet aggregations. So we could make them 
different. For example: *arrayMax* instead of *max*.

> Add variance Stream Evaluator
> -----------------------------
>
>                 Key: SOLR-10682
>                 URL: https://issues.apache.org/jira/browse/SOLR-10682
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Joel Bernstein
>
> The variance Stream Evaluator will calculate the variance of a vector of 
> numbers.
> {code}
> v = var(colA)
> {code}



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