alamb commented on issue #16453:
URL: https://github.com/apache/datafusion/issues/16453#issuecomment-2991076028

   If you want to re-use the DataFusion SQL planner (SqlToRel) I do think 
you'll need to put the columns in the table schema for planning
   
   Perhaps you could then have an optimizer pass that rewrites the plan to 
remove all references to those columns when you are adding the `WindowAssign` 
operator ?
   
   
   > But this approach is also not viable, because DataFusion requires 
aggregate functions to have at least one argument.
   
   Could we make DataFusion lift this restriction? 
   


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