Micah Kornfield created ARROW-5777:
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             Summary: [C++] BasicDecimal128 is a small object it doesn't always 
make sense to pass by const ref
                 Key: ARROW-5777
                 URL: https://issues.apache.org/jira/browse/ARROW-5777
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Micah Kornfield
            Assignee: Micah Kornfield


For the builder use case we saw 10% improvement in performance by not using 
const ref.  
Add benchmarks and look at where it makes sense to avoid passing by ref.



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