Greg Miller created LUCENE-10245:
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Summary: 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
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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