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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