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https://issues.apache.org/jira/browse/LUCENE-10245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17472345#comment-17472345
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Greg Miller commented on LUCENE-10245:
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Pushed to {{branch_9x}} / {{{}main{}}}. Resolving.
> 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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