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https://issues.apache.org/jira/browse/LUCENE-9946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337418#comment-17337418
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Greg Miller commented on LUCENE-9946:
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I've got a very rough draft of this for {{LongRangeFacetCounts}} up over here
if anyone is interested. If the community is in favor of moving forward with
this, I'll clean it up, extend the idea to {{DoubleRangeFacetCount}} add tests,
etc. and open up a PR.
https://github.com/apache/lucene/compare/main...gsmiller:LUCENE-9946/draft
> 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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