presto-spi/src/main/java/io/prestosql/spi/type/UnscaledDecimal128Arithmetic.java/UnscaledDecimal128Arithmetic/compareAbsolute
class UnscaledDecimal128Arithmetic:    public static int compareAbsolute(Slice left, Slice right)
    {
        long leftHigh = getLong(left, 1);
        long rightHigh = getLong(right, 1);
        if (leftHigh != rightHigh) {
            return Long.compareUnsigned(leftHigh, rightHigh);
        }

        long leftLow = getLong(left, 0);
        long rightLow = getLong(right, 0);
        if (leftLow != rightLow) {
            return Long.compareUnsigned(leftLow, rightLow);
        }

        return 0;
    }