Method getHash

src/Functions/FunctionsStringHash.cpp:371–381

        }

        UInt64 getHash()
        {
            if (values.empty())
                return 0;

            UInt64 res = 0;
            for (auto it = values.begin(); it != values.end(); ++it)
                res = CityHash_v1_0_2::Hash128to64(CityHash_v1_0_2::uint128(res, it->first));

            return res;
        }

        void fill(ColumnTuple & strings)
        {