paleolimbot commented on issue #35531:
URL: https://github.com/apache/arrow/issues/35531#issuecomment-1561118107
> Or, whether such conversion should be supported or rather an error should
be raised.
I think you could do both via `schema=None` as the default? That's the case
most of the time anyway ("just get me this array").
```python
class Integerish:
def __arrow_c_array__(self, schema=None):
if schema is not None and :
raise ValueError("Only default export supported")
return make_array_capsule(self), make_int_schema_capsule()
```
Of course, if `schema` happens to be the correct type this will still error.
In R/nanoarrow I also have `infer_nanoarrow_schema()` (the type the array
*would* be if it were requested) so a consumer that, say, only supports signed
integer types can choose the appropriate signed type if `___arrow_c_schema__()`
returns an unsigned one. A producer like pyarrow can cast no problem (more
minimal producers would probably just error).
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