adriangb commented on issue #6051:
URL: https://github.com/apache/datafusion/issues/6051#issuecomment-3792322842

   May I suggest that since scans can now receive expressions we make a 
function called `filename()` that is implemented to return null by default but 
that scans swap out with the literal filename if they see it in the projection?
   
   Could be implemented as a “trivial expression” that we’ve been discussing 
Andrew. But there might also be too many implementation challenges getting it 
down into the scan.


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