Yifeng-Sigma commented on issue #5352:
URL: https://github.com/apache/arrow-rs/issues/5352#issuecomment-1919684624

   Thank you, this is super helpful! 
   
   If I'm only interested in the in the cumulative size of each element without 
considering the underlying implementation (whether it's copying, slicing), 
should I use `value_data().len()`?
   
   The context is that we want to serialize the arrow data to json, and before 
serialization we want to have a rough estimate on the size of serialized data 
based on arrow's data size.  


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