https://clickhouse-test-reports.s3.yandex.net/8367/333ec2e496f4fe4addd22d5fa7c5c2a499099c57/fuzzer/fuzzer.log#fail1
{
public:
    explicit KeyRef(char * data) : ptr(data) {}
    KeyRef() : ptr(nullptr) {}
    inline UInt16 size() const
    {
        UInt16 res;
        memcpy(&res, ptr, sizeof(res));
        return res;
    }
    inline size_t fullSize() const
    {
        return static_cast<size_t>(size()) + sizeof(UInt16);
    }
    inline bool isNull() const
    {
        return ptr == nullptr;
    }
    inline char * data() const
    {
        return ptr + sizeof(UInt16);
    }
    inline char * fullData() const
    {
        return ptr;
    }
    inline char * fullData()