**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)) │
└───────┴─────────────────────────────────┴───────────────────┴────────────────────────────────────────┘
```

static const Data & data(ConstAggregateDataPtr place) { return *reinterpret_cast<const Data *>(place); }
    DataTypePtr & data_type;
    UInt64 max_elems;
public:
    GroupArrayGeneralListImpl(const DataTypePtr & data_type_, UInt64 max_elems_ = std::numeric_limits<UInt64>::max())
        : IAggregateFunctionDataHelper<GroupArrayGeneralListData<Node>, GroupArrayGeneralListImpl<Node, Trait>>({data_type_}, {})
        , data_type(this->argument_types[0])
        , max_elems(max_elems_)
    {
    }
    String getName() const override { return getNameByTrait<Trait>(); }
    DataTypePtr getReturnType() const override { return std::make_shared<DataTypeArray>(data_type); }
    void add(AggregateDataPtr place, const IColumn ** columns, size_t row_num, Arena * arena) const override
    {
        if (limit_num_elems && data(place).elems >= max_elems)
            return;
        Node * node = Node::allocate(*columns[0], row_num, arena);
        if (unlikely(!data(place).first))
        {
            data(place).first = node;
            data(place).last = node;
        }
        else
        {
            data(place).last->next = node;
            data(place).last = node;
        }
        ++data(place).elems;
    }
    void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs, Arena * arena) const override