presto-main/src/main/java/io/prestosql/operator/scalar/MathFunctions.java/MathFunctions/decimalModFunction
class MathFunctions:    private static SqlScalarFunction decimalModFunction()
    {
        Signature signature = modulusSignatureBuilder()
                .kind(SCALAR)
                .name("mod")
                .build();
        return modulusScalarFunction(signature);
    }