timsaucer commented on issue #18477:
URL: https://github.com/apache/datafusion/issues/18477#issuecomment-3550042932

   In https://github.com/apache/datafusion/pull/18813 I took a first stab at 
what this might look like. This is impactful to the work I've been doing for 
the FFI crates and I think it might make my life vastly simpler if we have it 
or something like it implemented.
   
   I'm not crazy about how a lot of the methods just mirror those in the 
`PhysicalExtensionCodec` but what this does do is give us a mutable wrapper 
around those so we can do tracking and other things. I don't think we can just 
update the `PhysicalExtensionCodec` with `&mut self` because it appears there 
is a use case where we pass around `Arc<dyn PhysicalExtensionCodec>` and also 
`Arc<TaskContext>`. In my experimentation I found that to implement mutable 
version of `PhysicalExtensionCodec` I had to end up cloning `TaskContext`, 
which isn't ideal.


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