timsaucer commented on PR #19234:
URL: https://github.com/apache/datafusion/pull/19234#issuecomment-3636270153

   When I was testing this with the FFI work previously I found switching from 
`&dyn PhysicalExtensionCodec` to using generics on the functions was a blocker 
for the FFI work. However I moved away from using the physical codec in my work 
and I only use the logical codec. As long as we don't make the same changes in 
the logical codec, it shouldn't be a blocker for our existing work. I *could* 
see a potential for someone who wants to use the FFI_PhysicalExtensionCodec 
because it doesn't know the concrete type.
   
   It *feels* not ideal to then have two different code structures for the 
logical and physical codecs.
   
   Do you think there's a real performance enhancement to gain by using 
generics over keeping it with passing `&dyn`? Is it really about how many 
methods people need to implement?


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