gsmiller opened a new pull request #585:
URL: https://github.com/apache/lucene/pull/585


   # Description
   
   Facet implementations have seen performance improvements by unwrapping 
singleton doc values for situations where the underlying field is actually 
single-valued. This change adds the optimization for counting in taxonomy 
faceting (bringing consistency with the countAll implementation along with SSDV 
faceting, etc.).
   
   # Solution
   
   Try unwrapping the `SortedNumericDocValues` as a `NumericDocValues` and use 
the single-valued field directly if possible.
   
   # Tests
   
   Existing tests cover this faceting implementation. Ran benchmarks as well. 
Saw very marginal improvements and no regressions.
   
   # Checklist
   
   Please review the following and check all that apply:
   
   - [x] I have reviewed the guidelines for [How to 
Contribute](https://wiki.apache.org/lucene/HowToContribute) and my code 
conforms to the standards described there to the best of my ability.
   - [x] I have created a Jira issue and added the issue ID to my pull request 
title.
   - [x] I have given Lucene maintainers 
[access](https://help.github.com/en/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork)
 to contribute to my PR branch. (optional but recommended)
   - [x] I have developed this patch against the `main` branch.
   - [x] I have run `./gradlew check`.
   - [ ] I have added tests for my changes.
   


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