gerlowskija opened a new pull request #1171: SOLR-13892: Add 'top-level' docValues Join implementation URL: https://github.com/apache/lucene-solr/pull/1171 # Description Some join usecases are better served (performance wise) by using top-level docValues structures, because they avoid some wasteful seeking and iteration that the per-segment alternatives do. # Solution This PR introduces a "TopLevelJoinQuery" which can be run on join's where the fields in question have docValues enabled. This scales much better with the number of "from" query matches than existing alternatives. Since it's implemented as a Two-Phase Iterator it scales less well by the number of overall matches. See SOLR-13892 for more in-depth performance discussion. # Tests Beefed up tests in `TestJoin` to prove correctness. Wrote a performance test driver `TestJoinQueryPerformance` that allows reproduction of the perf results. (Though this will not be committed in the final version) # Checklist Please review the following and check all that apply: - [x] I have reviewed the guidelines for [How to Contribute](https://wiki.apache.org/solr/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 Solr 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 `master` branch. - [x] I have run `ant precommit` and the appropriate test suite. - [x] I have added tests for my changes. - [x] I have added documentation for the [Ref Guide](https://github.com/apache/lucene-solr/tree/master/solr/solr-ref-guide) (for Solr changes only).
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