wjones127 opened a new pull request, #4232:
URL: https://github.com/apache/arrow-rs/pull/4232

   # Which issue does this PR close?
   
   Closes #4222
   
   # Rationale for this change
    
   The underlying implementation is arguably Send, and making it not Send makes 
it extremely hard to work with. This drops support for Clone, but if someone 
wants to sacrifice Send for Clone, they can wrap it in an Arc themselves.
   
   # What changes are included in this PR?
   
   * Alters implementation of ArrowArrayStreamReader to use Box instead of Arc 
internally.
   * Refactors PyArrowConvert convert into a few different traits, so that we 
can differentiate between conversions that borrow vs those that take ownership.
   
   # Are there any user-facing changes?
   
   This is a breaking change to `PyArrowConvert`
   


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