Greg Miller created LUCENE-9950:
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Summary: Support both single- and multi-value string fields in
facet counting (non-taxonomy based approaches)
Key: LUCENE-9950
URL: https://issues.apache.org/jira/browse/LUCENE-9950
Project: Lucene - Core
Issue Type: Improvement
Components: modules/facet
Affects Versions: main (9.0)
Reporter: Greg Miller
Users wanting to facet count string-based fields using a non-taxonomy-based
approach can use {{SortedSetDocValueFacetCounts}}, which accumulates facet
counts based on a {{SortedSetDocValues}} field. This requires the stored doc
values to be multi-valued (i.e., {{SORTED_SET}}), and doesn't work on
single-valued fields (i.e., SORTED). In contrast, if a user wants to facet
count on a stored numeric field, they can use {{LongValueFacetCounts}}, which
supports both single- and multi-valued fields (and in LUCENE-9948, we now
auto-detect instead of asking the user to specify).
Let's update {{SortedSetDocValueFacetCounts}} to also support, and
automatically detect single- and multi-value fields. Note that this is a
spin-off issue from LUCENE-9946, where [~rcmuir] points out that this can
essentially be a one-line change, but we may want to do some class renaming at
the same time. Also note that we should do this in
{{ConcurrentSortedSetDocValuesFacetCounts}} while we're at it.
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