presto-spi/src/main/java/io/prestosql/spi/type/UnscaledDecimal128Arithmetic.java/UnscaledDecimal128Arithmetic/getInt
class UnscaledDecimal128Arithmetic:    public static int getInt(Slice decimal, int index)
    {
        int value = getRawInt(decimal, index);
        if (index == SIGN_INT_INDEX) {
            value &= ~SIGN_INT_MASK;
        }
        return value;
    }