tustvold opened a new issue, #2658:
URL: https://github.com/apache/arrow-datafusion/issues/2658

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   
   Currently there is no obvious way for a `TableProvider` to access session 
state without introducing potential ref cycles - 
https://github.com/apache/arrow-datafusion/issues/2657
   
   **Describe the solution you'd like**
   
   I would like to expose a `&SessionState` to `TableProvider::scan` to allow 
them to make use of session state for query planning
   
   **Describe alternatives you've considered**
   
   We could not do this
   


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