Jefffrey commented on PR #20169:
URL: https://github.com/apache/datafusion/pull/20169#issuecomment-4303272442

   > > It would be good to have justification somewhere in code for this 
physical expression; e.g. normally this would not be created during planning as 
logical layer should handle resolution, but what cases this is useful for, etc.
   > 
   > Is it ok to introduce some planning config flag to allow physical 
placeholders planning? If it is false -- we return an error (keep behavior as 
is).
   
   Might be quite a niche config 🤔 


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