AdamGS opened a new pull request, #10333:
URL: https://github.com/apache/arrow-rs/pull/10333

   # Which issue does this PR close?
   
   - Closes #NNN.
   
   # Rationale for this change
   
   For cases where adding or subtracting decimal values that have the same 
scale, we end up doing a bunch of extra checked mul operations, and turns out 
if we don't it improves performance significantly.
   
   # What changes are included in this PR?
   
   1. Specialize add/sub for decimals when they have the same scale.
   2. Benchmark to measure the impact on all decimals types.
   
   # Are these changes tested?
   
   Existing tests, 1 additional test I added to i256 which was my original 
target.
   
   # Are there any user-facing changes?
   
   None
   


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