not-my-profile commented on PR #7175:
URL: 
https://github.com/apache/arrow-datafusion/pull/7175#issuecomment-1684547594

   Thanks for bringing this up here. I disagree that this PR introduced any new 
dependency ... it just made the existing dependency explicit. Since I think you 
should of course be able to implement your own data source scanning execution 
plan (which previously you could not because of the hard-coded downcasting in 
the physical plan).
   
   So I think the solution here is to move the new `file_scan_config` method to 
a new `DataSource` trait that execution plans have to implement in order to use 
them with the physical plan. What do you think? (take what I'm saying with a 
grain of salt, I'm not that familiar with datafusion).


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