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https://issues.apache.org/jira/browse/LUCENE-10245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17472336#comment-17472336
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ASF subversion and git services commented on LUCENE-10245:
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Commit 82703757fe05a1d3b9efe28d766d4bc3df8a060f in lucene's branch 
refs/heads/main from Greg Miller
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=8270375 ]

LUCENE-10245: Addition of MultiDoubleValues(Source) and MultiLongValues(Source) 
along with faceting capabilities (#543)



> Allow users to provide DocValues to (some) Facets Implementations
> -----------------------------------------------------------------
>
>                 Key: LUCENE-10245
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10245
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>            Reporter: Greg Miller
>            Assignee: Greg Miller
>            Priority: Minor
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> We have some {{Facets}} implementations that do aggregations over numeric 
> values associated with each doc (e.g., {{{}DoubleRangeFacetCounts{}}}, 
> {{{}LongValueFacetCounts{}}}, etc.). These implementations allow the user to 
> either specify, 1) a field to source the doc values from, or 2) a custom 
> source of values in the form of {{{}DoubleValueSource{}}}, 
> {{{}LongValueSource{}}}, etc.
> Unfortunately, these {{xxValueSource}} implementations don't support multiple 
> values per doc, while indexed doc values do. So if the user has indexed doc 
> values they want to facet over, it works just fine if docs are multi-valued. 
> But if they want to provide a custom source of data, they're restricted to 
> single-value only.
> We should consider allowing users to provide their own doc values instances 
> in favor of the {{xxValueSource}} instances. (I'd propose we deprecate the 
> {{xxValueSource}} approach)



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