Re: [PR] Refactor protobuf ser/de traits [datafusion]

["adriangb (via GitHub)" <gi...@apache.org>]

adriangb commented on PR #19234:
URL: https://github.com/apache/datafusion/pull/19234#issuecomment-3633416759

   > will have a better look later, on the quick look I think it makes sense. One thing i'm not sure is use of generics, it might be better to leave it as &dyn (especially with Tims ffi work). I don't think this is on critical path so it should not impact performance (a lot)
   > 
   > Would it be possible to keep it as dyn @adriangb ?
   
   Under the current design it's not, here's an example demonstrating the problem: https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=636bc71d4c8c5e8172e41bddef3b1160.
   
   Essentially with dynamic dispatch the trait cannot participate in the code flow, it can only handle being a "fallback" as it is now / cannot call back into tree recursion. I haven't found a way around that (other than using generics as I do here)
   


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