roee88 commented on issue #595:
URL: https://github.com/apache/arrow-rs/issues/595#issuecomment-912038074


   @pitrou the question is whether it's safe to assume that other than 
nullifying the release callback the consumer doesn't change anything in the 
structures. 
   
   Two examples to demonstrate the difference in implementation:
   1. In C++ the allocated format field is released based on a pointer stored 
in private data. In Rust it's released based on the format field itself (in the 
ArrowSchema structure). 
   2. In C++ the release callback of every child in the children field is 
called. In Rust the release callback of every child in private data is called.
   


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