timsaucer commented on PR #20249:
URL: https://github.com/apache/datafusion/pull/20249#issuecomment-3954838147

   I did a little playing around with this to see how it would fit in with 
ballista + datafusion-python. I'm becoming convinced that we want to move 
`PhysicalPlanner` and `ExtensionPlanner` also out of `core` and into 
`datafusion-session` and move from taking `&SessionState` to `&dyn Session`. 
This would mean also moving `PhysicalOptimizerRule` out to 
`datafusion_physical_plan` in order to break a circular dependency. The good 
news is that my work on https://github.com/apache/datafusion/issues/20450 would 
already support adding the physical optimizers to `FFI_Session`.
   
   I ran into these issues because I found that we are relying on downcasting 
to `SessionState` and that won't work when we're passing around a `FFI_Session`.


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