alamb opened a new pull request, #7772:
URL: https://github.com/apache/arrow-rs/pull/7772

   Draft as I need to
   - [ ] Review test coverage
   - [ ] Run benchmarks
   
   # Which issue does this PR close?
   
   - Closes https://github.com/apache/arrow-rs/issues/7763
   
   # Rationale for this change
   
   I want the `coalesce` operation to be as fast as possible
   
   # What changes are included in this PR?
   
   Add specialied `InProgressPrimitiveArray` that avoids keeping a second copy 
of the primitive arrays that are concat'ed together
   
   I don't expect this will make a huge performance difference -- but it is 
needed to implement https://github.com/apache/arrow-rs/issues/7762 which I do 
expect to make a difference
   
   # Are these changes tested?
   
   There are already existing tests for u32s which cover this code path. I also 
added a test for StringArray which ensures the generic in progress array is 
still covered. 
   
   
   # Are there any user-facing changes?
   
   No, this is an internal optimization only


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