presto-spi/src/main/java/io/prestosql/spi/type/UnscaledDecimal128Arithmetic.java/UnscaledDecimal128Arithmetic/setToZero
class UnscaledDecimal128Arithmetic:    private static void setToZero(Slice decimal)
    {
        for (int i = 0; i < NUMBER_OF_LONGS; i++) {
            setRawLong(decimal, i, 0);
        }
    }