pitrou commented on code in PR #47445:
URL: https://github.com/apache/arrow/pull/47445#discussion_r2307006723


##########
cpp/src/arrow/compute/kernels/scalar_arithmetic.cc:
##########
@@ -670,7 +670,6 @@ void AddDecimalBinaryKernels(const std::string& name, 
ScalarFunction* func) {
     out_type = OutputType(ResolveDecimalMultiplicationOutput);
   } else if (op == "divide") {
     out_type = OutputType(ResolveDecimalDivisionOutput);
-    constraint = BinaryDecimalScale1GeScale2();

Review Comment:
   Why not a `DecimalsHaveSameScaleAndPrecision`? (or full type equality, which 
is exactly equivalent here)



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