JakeDern opened a new pull request, #10128:
URL: https://github.com/apache/arrow-rs/pull/10128

   # Which issue does this PR close?
   
   - Closes #10127
   
   # Rationale for this change
   
   This is a follow on to #10044, applying basically the same optimization for 
dictionary batches.
   
   This needs to wait for #10122 before merge.
   
   # What changes are included in this PR?
   
   - Add a gather step for collecting dictionary buffers and then write them 
direct to the final writer
   - Unify the write code path for dictionaries with the one for record batches 
as they're basically the same
   - Update a couple of function names to more accurately reflect their purpose
   
   # Are these changes tested?
   
   Yes, existing unit tests should cover the change.
   
   # Are there any user-facing changes?
   
   No.


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