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https://issues.apache.org/jira/browse/LUCENE-9946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337650#comment-17337650
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Greg Miller commented on LUCENE-9946:
-------------------------------------
Also...
{quote}This also works for cases where the user used multi-valued field type
but only indexed single-valued data in practice (the codec detects this case
today and wraps it DocValues.singleton).
{quote}
That's cool! I didn't realize Lucene does this. Neat!
> Support multi-value fields in range facet counting
> --------------------------------------------------
>
> Key: LUCENE-9946
> URL: https://issues.apache.org/jira/browse/LUCENE-9946
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Affects Versions: main (9.0)
> Reporter: Greg Miller
> Priority: Minor
>
> The {{RangeFacetCounts}} implementations ({{LongRangeFacetCounts}} and
> {{DoubleRangeFacetCount}}) only work on single-valued fields today. In
> contrast, the more recently added {{LongValueFacetCounts}} implementation
> supports both single- and multi-valued fields (LUCENE-7927). I'd like to
> extend multi-value support to both of the {{LongRangeFacetCounts}}
> implementations as well.
> Looking through the implementations, I can't think of a good reason to _not_
> support this, but maybe I'm overlooking something?
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