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https://issues.apache.org/jira/browse/LUCENE-9952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Greg Miller updated LUCENE-9952:
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    Affects Version/s:     (was: 8.9)
                       main (9.0)

> FacetResult#value can be inaccurate in SortedSetDocValueFacetCounts
> -------------------------------------------------------------------
>
>                 Key: LUCENE-9952
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9952
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/facet
>    Affects Versions: main (9.0)
>            Reporter: Greg Miller
>            Priority: Minor
>
> As described in a dev@ list 
> [thread|http://mail-archives.apache.org/mod_mbox/lucene-dev/202105.mbox/%3CCANJ0CDo-9zt0U_pxWNOBkfiJpaAXZGGwOEJPnENAP6JzWz_t9Q%40mail.gmail.com%3E],
>  the value of {{FacetResult#value}} can be incorrect in SSDV faceting when 
> docs are multi-valued (affects both {{SortedSetDocValueFacetCounts}} and 
> {{ConcurrentSortedSetDocValueFacetCounts}}). If a doc has multiple values in 
> the same dimension, it will be counted multiple times when populating the 
> counts of {{FacetResult#value}}.
> We should either provide an accurate count, or provide {{-1}} if we don't 
> have an accurate count (like we do in taxonomy faceting). I _think_ this 
> change will be a bit involved though as SSDV facet counting likely needs to 
> be made aware of {{FacetConfig}}.
> NOTE: I've updated this description to describe only the SSDV case after 
> spinning off LUCENE-9953 to track the LongValueFacetCounts case.



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