Jefffrey commented on issue #6543:
URL: 
https://github.com/apache/arrow-datafusion/issues/6543#issuecomment-2039347382

   Another case is when selecting same value literals
   
   ```sql
   DataFusion CLI v37.0.0
   ❯ select 1, 1;
   Error during planning: Projections require unique expression names but the 
expression "Int64(1)" at position 0 and "Int64(1)" at position 1 have the same 
name. Consider aliasing ("AS") one of them.
   ❯
   ```


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