presto-main/src/main/java/io/prestosql/type/DecimalInequalityOperators.java/DecimalInequalityOperators/makeBinaryOperatorFunctionBuilder
class DecimalInequalityOperators:    private static PolymorphicScalarFunctionBuilder makeBinaryOperatorFunctionBuilder(OperatorType operatorType)
    {
        Signature signature = Signature.builder()
                .kind(SCALAR)
                .operatorType(operatorType)
                .argumentTypes(DECIMAL_SIGNATURE, DECIMAL_SIGNATURE)
                .returnType(BOOLEAN.getTypeSignature())
                .build();
        return SqlScalarFunction.builder(DecimalInequalityOperators.class)
                .signature(signature)
                .deterministic(true);
    }