lidavidm commented on code in PR #43632:
URL: https://github.com/apache/arrow/pull/43632#discussion_r1821689061


##########
cpp/src/arrow/c/abi.h:
##########
@@ -356,8 +356,7 @@ struct ArrowAsyncDeviceStreamHandler {
   // A producer that receives a non-zero return here should stop producing and 
eventually
   // call release instead.
   int (*on_schema)(struct ArrowAsyncDeviceStreamHandler* self,
-                   struct ArrowAsyncProducer* producer, struct ArrowSchema* 
stream_schema,
-                   const char* addl_metadata);
+                   struct ArrowSchema* stream_schema, const char* 
addl_metadata);

Review Comment:
   The metadata might not be available until after the callback anyways so 
there'd instead be the question of when it's valid/invalid



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