westonpace commented on PR #15180:
URL: https://github.com/apache/arrow/pull/15180#issuecomment-1413866907

   The test failures revealed another issue which I addressed here.  In 
`DispatchBest` for simple arithmetic we were declaring `float32` to be the 
common type between `decimal` and `float32`.  However, I believe `float64` is a 
more accurate choice.  This also matches the [rule we use for trigonometric 
functions](https://github.com/apache/arrow/blob/apache-arrow-11.0.0/cpp/src/arrow/compute/kernels/scalar_arithmetic.cc#L749-L753).
  CC @lidavidm for second opinion.
   
   @nealrichardson there was another R test failure which I deemed inevitable 
and I have updated the test.  It is a slight behavior change.  Does this seem 
acceptable: 
https://github.com/apache/arrow/pull/15180/files#diff-45391fbe156c77f99e14090369faed8e11ec49583634fa1a51b634ef8b9eb5bf


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