suneet-s opened a new pull request #9271: Make JoinableFactory an extension 
point
URL: https://github.com/apache/druid/pull/9271
 
 
   This change makes it so that extensions can register a JoinableFactory that
   should be used for a DataSource.
   
   Extensions can provide the factories via DruidBinders#joinableFactoryBinder
   Known DataSources - like InlineDataSource are provided in the
   JoinableFactoryModule. This module installs a FactoryWarehouse that is
   used to decide which factory should be used to generate the Joinable for
   the provided DataSource.
   
   The ExtensionPoint is marked as Beta since it is not yet clear if this
   needs to remain available to other extensions or if the best way to
   register a factory is by using the datasource class.
   
   <hr>
   
   This PR has:
   - [ ] been self-reviewed.
      - [ ] using the [concurrency 
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
 (Remove this item if the PR doesn't have any relation to concurrency.)
   - [ ] 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.
   - [ ] 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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