https://clickhouse-test-reports.s3.yandex.net/17375/99073c26ee2692f8efe2ab14b2d8ae0fd813b80e/fuzzer/fuzzer.log

```
SELECT
    k,
    topK(v)
FROM 
(
    SELECT
        number % 7 AS k,
        arrayMap(x -> arrayMap(x -> if(x = 0, NULL, toString(x)), range(x)), range(intDiv(number, 1))) AS v
    FROM system.numbers
    LIMIT 257
)
GROUP BY k
ORDER BY k ASC
```
private boost::noncopyable,
    protected Hash,
    protected Allocator,
    protected Cell::State,
    protected ZeroValueStorage<Cell::need_zero_value_storage, Cell>     
{
public:
    
    
    static constexpr size_t initial_buffer_bytes
        = Grower::initial_count * sizeof(Cell);
    static_assert(allocatorInitialBytes<Allocator> == 0
        || allocatorInitialBytes<Allocator> == initial_buffer_bytes);
protected:
    friend class const_iterator;