uranusjr opened a new pull request #20104:
URL: https://github.com/apache/airflow/pull/20104


   This can be used like this:
   
   ```python
   @provide_session
   def some_function(arg1, arg2, session: Session = NEW_SESSION) -> None:
       session.query(Model)...
   ```
   
   This eliminates the need to use `Optional[Session] = None` to reduce 
boilerplate code.
   
   cc @potiuk this can be useful for your #19914.


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