chenkovsky commented on PR #14362:
URL: https://github.com/apache/datafusion/pull/14362#issuecomment-2625266767

   > > Another thing I haven't checked for this approach is that system column 
doesn't only apply on scan. it can also be applied on Projection, Join, 
SubqueryAlias
   > 
   > Could you give example test cases that you think are relevant? I have a 
hunch that the current implementation may already handle these correctly.
   
   sorry I have no test. I haven't implemented these features now.  because my 
implementation changes some APIs, so I think it's better to do it when APIs are 
stable.


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