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SOLR-18304: Optimize collapse performance for String fields (#4621)#4634

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SOLR-18304: Optimize collapse performance for String fields (#4621)#4634
bartoszfidrysiak wants to merge 1 commit into
apache:branch_10xfrom
bartoszfidrysiak:SOLR-18304-collapse-string-sort-port-10

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@bartoszfidrysiak bartoszfidrysiak commented Jul 14, 2026

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https://issues.apache.org/jira/browse/SOLR-18304

Full description is present in the PR to main branch: #4621.
This PR contains only cherry pick of 8088be23 commit from main branch. No additional changes or conflict resolutions.

  • I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
  • I have created a Jira issue and added the issue ID to my pull request title.
  • I have given Solr maintainers access to contribute to my PR branch. (optional but recommended, not available for branches on forks living under an organisation)
  • I have developed this patch against the main branch.
  • I have run ./gradlew check.
  • I have added tests for my changes.
  • I have added documentation for the Reference Guide
  • I have added a changelog entry for my change

)

Affects Solr 9.x and beyond.  As of Lucene 9 (technically late 8.x?), looking up a value became somewhat expensive, motivating being clever to avoid resolving the value.

(cherry picked from commit 8088be2)
@bartoszfidrysiak bartoszfidrysiak marked this pull request as ready for review July 14, 2026 05:59
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