thinkharderdev commented on issue #4426:
URL: 
https://github.com/apache/arrow-datafusion/issues/4426#issuecomment-1332019200

   > This is great @NGA-TRAN -- thank you for writing it up. My only feedback 
is that for option 2 it might be easier if the output was a new LogicalPlan 
that had the parameter values filled in, which can then be fed through the rest 
of the planning machinery.
   
   I agree. Conceptually it seems like the bind variable can just be an `Expr` 
but physical planning should fail if it hits any bind variable exprs. So before 
physical planning you rewrite the plan to replace any such expressions with 
user-supplied literals. 


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