presto-spi/src/main/java/io/prestosql/spi/type/UnscaledDecimal128Arithmetic.java/UnscaledDecimal128Arithmetic/getRawInt
class UnscaledDecimal128Arithmetic:    private static int getRawInt(Slice decimal, int index)
    {
        return unsafe.getInt(decimal.getBase(), decimal.getAddress() + SIZE_OF_INT * index);
    }