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https://issues.apache.org/jira/browse/SOLR-11706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16278002#comment-16278002
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David Smiley commented on SOLR-11706:
-------------------------------------

I just want to point out that "multi-valued functions" in fact exist -- 
{{org.apache.lucene.queries.function.valuesource.MultiValueSource}}.  I'm not a 
fan -- the API feels awkward to me, but there it is.  We pretty much only _use_ 
it today for some legacy-ish spatial stuff.  I'd prefer this interface and some 
of the related methods on FunctionValues that take arrays be deprecated out of 
Lucene.

> JSON FacetModule can't compute stats (min,max,etc...) on multivalued fields
> ---------------------------------------------------------------------------
>
>                 Key: SOLR-11706
>                 URL: https://issues.apache.org/jira/browse/SOLR-11706
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Hoss Man
>         Attachments: SOLR-11706.patch
>
>
> While trying to write some tests demonstrating equivalences between the 
> StatsComponent and the JSON FacetModule i discovered that the FacetModules 
> stat functions (min, max, etc...) don't seem to work on multivalued fields.
> Based on the stack traces, i gather the problem is because the FacetModule 
> seems to rely exclusively on using the "Function" parsers to get a value 
> source -- apparently w/o any other method of accumulating numeric stats from 
> multivalued (numeric) DocValues?



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