jon-wei opened a new pull request #9373: Fix join filter push down post-join 
virtual column handling
URL: https://github.com/apache/druid/pull/9373
 
 
   This PR fixes an issue in JoinFilterAnalyzer where post-join virtual columns 
were incorrectly identified as belonging to the base table column set, leading 
to filters on such virtual columns being pushed down incorrectly.
   
   The PR fixes the issue by passing in the set of base table columns 
(including any pre-join virtual columns) to JoinFilterAnalyzer.splitFilter 
instead of checking prefixes.
   
   This PR has:
   - [x] been self-reviewed.
   - [ ] added documentation for new or modified features or behaviors.
   - [ ] added Javadocs for most classes and all non-trivial methods. Linked 
related entities via Javadoc links.
   - [ ] added or updated version, license, or notice information in 
[licenses.yaml](https://github.com/apache/druid/blob/master/licenses.yaml)
   - [x] added comments explaining the "why" and the intent of the code 
wherever would not be obvious for an unfamiliar reader.
   - [x] added unit tests or modified existing tests to cover new code paths.
   - [ ] added integration tests.
   - [ ] been tested in a test Druid cluster.
   

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