paleolimbot commented on issue #38325:
URL: https://github.com/apache/arrow/issues/38325#issuecomment-2037583994

   That is a good question!
   
   I think Joris mentioned earlier that one approach would be to `try:` and do 
something else if there was an error passing the extra keywork argument. That 
seems like it would scale poorly and perhaps lead to confusing errors but there 
may be precedent/a better way to do this.
   
   It seems like `inspect.signature()` makes it possible to introspect argument 
names, if the evolution of this protocol can be fully captured by the existence 
of formal argument names. I checked and it seems to work for methods 
implemented in Cython (worth checking that this is also true for methods 
implemented in pybind11 or nanobind).
   
   One could also provide `__arrow_c_capabilities__` (or something) such that 
`hasattr(x, "__arrow_c_capabilities__") and "something" in 
x.__arrow_c_capabilities__` captures the ability to use one or more of the 
protocol methods in a particular way. Perhaps versioning the protocol and 
querying that would be more straightfoward.
   
   Or perhaps other ways?


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