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  1. Lucene - Core
  2. LUCENE-9950

Support both single- and multi-value string fields in facet counting (non-taxonomy based approaches)

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Details

    • Improvement
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 9.0
    • 9.0, 8.9
    • modules/facet
    • None
    • New

    Description

      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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            Unassigned Unassigned
            gsmiller Greg Miller
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