[jira] [Created] (LUCENE-10250) Add hierarchical labels to SSDV facets

["Marc D'Mello (Jira)" <ji...@apache.org>]

Marc D'Mello created LUCENE-10250:
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             Summary: Add hierarchical labels to SSDV facets
                 Key: LUCENE-10250
                 URL: https://issues.apache.org/jira/browse/LUCENE-10250
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Marc D'Mello


Hi all,

I recently [added a new benchmarking task|https://github.com/mikemccand/luceneutil/issues/141] to {{luceneutil}} to count facets on a random word chosen from each document which would give us a very high cardinality facet benchmarking compared to the faceting benchmarks we already had. After being merged, [~mikemccand] pointed out some [interesting results|https://home.apache.org/~mikemccand/lucenebench/BrowseRandomLabelTaxoFacets.html] in the nightly benchmarks where the {{BrowseRandomLabelSSDVFacets}} task was much faster than the {{BrowseRandomLabelTaxoFacets}} task.

I was thinking that using SSDV facets instead of taxonomy facets for our use case at Amazon Product Search could potentially lead to some increases in QPS and decreases in index size, but the issue is we use hierarchical labels, and as I understand it, SSDV faceting only supports a 2 level hierarchy as of today. This leads to my question of why is there a limitation like this on SSDV facets? Is hierarchical labels just a feature that hasn't been implemented in SSDV facets yet, or is there some more complex reason that we can't add hierarchical labels to SSDV facets?

Thanks!



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