Caa52 opened a new pull request #529:
URL: https://github.com/apache/solr/pull/529


   https://issues.apache.org/jira/browse/SOLR-15257
   
   
   # Description
   
   Currently, we use the `getTopFilter` method in Filter to access a Query 
based on a DocSet. This is done via calling Filter's main method `getDocIdSet` 
and then calling an `iterator()`. However, with Filter going away, we still 
need the ability to have a Query based on a DocSet. Removing Filter requires 
reducing and possibly eliminating dependencies on `getDocIdSet` and implies 
that changes must be made to all callers that call Filter specific methods as 
well. 
   
   # Solution
   
   To access a Query based on a DocSet without going through Filter: 
   
   - Create a new Query, `DocSetQuery`, that emulates the behavior of Filter 
   - Delete all calls to `getDocIdSet` which is Filter's main method
   - Implement change to DocSet's API by replacing `getTopFilter` with 
`makeQuery` to help go from DocSet to a Query of the DocSet
   - Delete Filter class 
   
   # Tests
   
   Refactored all existing tests that were affected as a result of deleting 
Filter. Expanded test coverage by updating test suite to account for changes 
made. All tests are passing. 
   
   # 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 `main` branch.
   - [X] I have run `./gradlew check`.
   - [X] I have added tests for my changes.
   - [X] I have added documentation for the [Reference 
Guide](https://github.com/apache/solr/tree/main/solr/solr-ref-guide)
   


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