presto-spi/src/main/java/io/prestosql/spi/type/UnscaledDecimal128Arithmetic.java/UnscaledDecimal128Arithmetic/multiply
class UnscaledDecimal128Arithmetic:    public static Slice multiply(Slice decimal, int multiplier)
    {
        Slice result = Slices.copyOf(decimal);
        multiplyDestructive(result, multiplier);
        return result;
    }