jon-wei opened a new pull request #9472: Add option to control join filter 
rewrites
URL: https://github.com/apache/druid/pull/9472
 
 
   This PR adds a new query context option for joins `enableJoinFilterRewrite` 
that controls whether filter clauses that reference non-base table columns will 
be rewritten into filters on base table columns.
   
   The default is false, as the rewrite can be costly and not worth it.
   
   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)
   - [ ] 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.
   - [x] been tested in a test Druid cluster.
   

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