**How to reproduce**
Clickhouse version 20.11.5.18, 20.8.7.15, 20.3.19
```
SELECT
    groupUniqArray(val) AS uniq,
    toTypeName(uniq),
    groupArray(val) AS arr,
    toTypeName(arr)
FROM
(
    SELECT CAST(number % 2, 'Enum(\'hello\' = 1, \'world\' = 0)') AS val
    FROM numbers(2)
)

Query id: d4657f27-c8bd-4174-9947-c6c48d0222d5

┌─uniq──┬─toTypeName(groupUniqArray(val))─┬─arr───────────────┬─toTypeName(groupArray(val))────────────┐
│ [0,1] │ Array(Int8)                     │ ['world','hello'] │ Array(Enum8('world' = 0, 'hello' = 1)) │
└───────┴─────────────────────────────────┴───────────────────┴────────────────────────────────────────┘
```

{
        const auto & value = this->data(place).value;
        size_t size = value.size();
        writeVarUInt(size, buf);
        buf.write(reinterpret_cast<const char *>(value.data()), size * sizeof(value[0]));
        if constexpr (Trait::sampler == Sampler::RNG)
        {
            DB::writeIntBinary<size_t>(this->data(place).total_values, buf);
            WriteBufferFromOwnString rng_buf;
            rng_buf << this->data(place).rng;
            DB::writeStringBinary(rng_buf.str(), buf);
        }
        
        
    }
    void deserialize(AggregateDataPtr place, ReadBuffer & buf, Arena * arena) const override