adriangb commented on PR #14837:
URL: https://github.com/apache/datafusion/pull/14837#issuecomment-2869167967

   > What if we just added a new method to the PhysicalExpr trait, like 
`evaluate_async()`? We could then call this from streams that might involve 
async work. The default implementation would delegate to `evaluate()`, but in 
the case of `ScalarFunctionExpr`, we could branch depending on the function 
type.
   
   How would that work going from sync -> async? For example: `1 = 2 OR 1 = 
call_llm_model_async()`. I imagine this would build something like 
`BinaryExpr(BinaryExpr(1, Eq, 2), Or, ScalarFunc(call_llm_model_async))`. If we 
call `evaluate_async` on the outer `BinaryExpr` it would call `evaluate()` by 
default so now you're in sync world. How do you break back into async world? Do 
we pass around a handle to the tokio runtime?


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