pitrou commented on code in PR #5070:
URL: https://github.com/apache/arrow-rs/pull/5070#discussion_r1391751340
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arrow-data/src/ffi.rs:
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@@ -66,8 +66,12 @@ impl Drop for FFI_ArrowArray {
unsafe impl Send for FFI_ArrowArray {}
unsafe impl Sync for FFI_ArrowArray {}
-// callback used to drop [FFI_ArrowArray] when it is exported
-unsafe extern "C" fn release_array(array: *mut FFI_ArrowArray) {
+/// callback used to drop [FFI_ArrowArray] when it is exported
+///
+/// # Safety
+///
+/// Must be passed a valid [FFI_ArrowArray].
+pub unsafe extern "C" fn release_array(array: *mut FFI_ArrowArray) {
Review Comment:
> I'm not familiar with the pycapsule internals, but one thing I wonder is
whether it runs _any_ destructor if you use `PyCapsule::new` instead of
`PyCapsule::new_with_destructor`.
Yes, it seems it does.
https://github.com/PyO3/pyo3/blob/c8fdb806300ff82747f58bcb9ca08abd3da480b4/src/types/capsule.rs#L273-L282
and
https://github.com/PyO3/pyo3/blob/c8fdb806300ff82747f58bcb9ca08abd3da480b4/src/types/capsule.rs#L78-L84
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