gsmiller opened a new pull request #143:
URL: https://github.com/apache/lucene/pull/143


   # Description
   
   This change allows users to sub-class `DrillSideways` and override the logic 
for creating a "drill down" `FacetsCollector`/`FacetsCollectorManager`. This is 
useful if the user doesn't want to collect for drill downs (e.g., they can 
provide `null`), or if they're already collecting for drill downs in a custom 
`Collector`/`CollectorManager` that's already being provided to `search`. In 
the latter case, they may want to override these methods to return `null` so 
they don't wastefully collect for drill downs twice (once in their customer 
collector and again internally to `DrillSideways`).
   
   # Solution
   
   `DrillSidewaysQuery`/`DrillSidewaysScorer` already support a `null` drill 
down `FacetsCollector` so this is as simple as modifying `DrillSideways` 
itself. I added `protected` methods for creation of the drill down collectors, 
allowing sub-classes to override.
   
   # Tests
   
   Added new tests to test a sub-classed `DrillSideways` that provides `null` 
collectors.
   
   # 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`.
   - [x] I have added tests for my changes.
   


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