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https://issues.apache.org/jira/browse/LUCENE-9952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17475682#comment-17475682
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Greg Miller commented on LUCENE-9952:
-------------------------------------
OK, I've got a fix for this working but am going to wait until we resolve the
performance regression stuff in LUCENE-10374 to avoid putting more faceting
related changes into the mix while sorting that out. I'll post a PR once that
business is resolved.
> 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: 9.0
> Reporter: Greg Miller
> Assignee: 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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