alamb commented on issue #8819:
URL: 
https://github.com/apache/arrow-datafusion/issues/8819#issuecomment-1918922093

   Hi @simonvandel   -- I wonder if you can provide some context about your 
expected behavior
   
   > The optimizer does not fail at the placeholder, but optimizes as much as 
it can with the info it has.
   
   It looks like the change in 
https://github.com/apache/arrow-datafusion/pull/9073 from @appletreeisyellow  
assumes the flow is:
   1. Create a logical plan
   2. Provide the parameters
   3. Run the optimizer
   
   The description on this ticket implies your flow would be
   1. Create the logical plan
   2. Run the optimizer
   3. Provide the parameters
   
   Is this correct? Is there a reason you want to run the optimizer prior to 
providing parameter values? 
   
   The reason I ask is that depending on what you are trying to do the 
changes/solution may be different.
   
   
   


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