[GitHub] [arrow-adbc] WillAyd commented on a diff in pull request #702: feat(python/adbc_driver_manager): experiment with using PyCapsules

["WillAyd (via GitHub)" <gi...@apache.org>]

WillAyd commented on code in PR #702:
URL: https://github.com/apache/arrow-adbc/pull/702#discussion_r1204484486


##########
python/adbc_driver_manager/adbc_driver_manager/_lib.pyx:
##########
@@ -460,6 +461,18 @@ cdef class _AdbcHandle:
                     f"with open {self._child_type}")
 
 
+cdef void pycapsule_stream_deleter(object stream_capsule):
+    cdef:
+        CArrowArrayStream* stream
+    # Do not invoke the deleter on a used/moved capsule
+    stream = <CArrowArrayStream*>cpython.PyCapsule_GetPointer(
+        stream_capsule, 'arrowarraystream'
+    )

Review Comment:
   Yes it can be. You can see this in the CPython documentation:
   
   https://docs.python.org/3/c-api/capsule.html#c.PyCapsule_GetPointer
   
   I think just need to immediately return if that is NULL



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