timsaucer commented on PR #18568:
URL: https://github.com/apache/datafusion/pull/18568#issuecomment-3508558749

   Blocking issue:
   
   We have places in the code like `get_scalar_value_from_args()` that will 
attempt to downcast `Arc<dyn PhysicalExpr>` into something like `Literal`. 
These fail when it is coming through FFI. We *could* special case Literal and 
maybe some others but it feels like this may be a long tail of special casing. 
It *may* be better to go back to using proto on the physical expressions.


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