westonpace commented on a change in pull request #10717:
URL: https://github.com/apache/arrow/pull/10717#discussion_r672525066



##########
File path: python/pyarrow/ipc.pxi
##########
@@ -158,9 +160,14 @@ cdef class IpcWriteOptions(_Weakrefable):
     def compression(self, value):
         if value is None:
             self.c_options.codec.reset()
-        else:
+        elif isinstance(value, str):
             self.c_options.codec = shared_ptr[CCodec](GetResultValue(
                 CCodec.Create(_ensure_compression(value))).release())
+        elif isinstance(value, Codec):
+            self.c_options.codec = (<Codec>value).wrapped

Review comment:
       There already was an `unwrap()` but it returned `CCodec*` and not 
`shared_ptr<CCoded>`.  I think I'd need to investigate where the current 
`unwrap()` was used.




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