paleolimbot commented on issue #18060:
URL: https://github.com/apache/datafusion/issues/18060#issuecomment-3412161745

   I don't mind either way...I think a FieldRef will make it less likely that 
will accidentally drop metadata (which is very difficult to track down), at the 
expense of potentially breaking existing pub field access. This would also let 
a cast express nullability which may be helpful if it can be respected (is 
there another way to make a nullable field nullable or vice versa?).
   
   After I finish with the `Placeholder` update I'm happy to take a look at 
this (or feel free to start and I can review!)


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