adriangb commented on PR #14362:
URL: https://github.com/apache/datafusion/pull/14362#issuecomment-2623125556

   Is this that important to support? The example seems a bit contrived, I 
think it'd be more reasonable if it occurred naturally  as part of a join or 
something where a user could unexpectedly run into it. Otherwise it seems to me 
like something very spark specific.
   
   Postgres for example doesn't let you duplicate system columns:
   
   ```sql
   create table t (ctid int);
   ERROR:  column name "ctid" conflicts with a system column name
   ```
   
   


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