presto-spi/src/main/java/io/prestosql/spi/type/UnscaledDecimal128Arithmetic.java/UnscaledDecimal128Arithmetic/compareUnsigned
class UnscaledDecimal128Arithmetic:    public static int compareUnsigned(long leftRawLow, long leftRawHigh, long rightRawLow, long rightRawHigh)
    {
        if (leftRawHigh != rightRawHigh) {
            return Long.compareUnsigned(leftRawHigh, rightRawHigh);
        }
        if (leftRawLow != rightRawLow) {
            return Long.compareUnsigned(leftRawLow, rightRawLow);
        }
        return 0;
    }