https://s3.amazonaws.com/clickhouse-test-reports/42778/66c179217cdfdee1ba0d4b4b577b1a62655caed0/fuzzer_astfuzzermsan//report.html

Minimal example
```sql
#!/usr/bin/clickhouse-client --queries-file

DROP TABLE IF EXISTS tab1;
DROP TABLE IF EXISTS tab2;

SET allow_suspicious_low_cardinality_types = 1;

create table tab1 (a1 Int32, b1 Int32) engine = MergeTree order by a1;
create table tab2 (a2 LowCardinality(Int32), b2 Int32) engine = MergeTree order by a2;

insert into tab1 values (1, 2);
insert into tab2 values (1, 2);

SET join_use_nulls = 1;

SELECT 1 FROM tab1 FULL OUTER JOIN tab2 ON b1 - 2 = a2 OR a1 = b2;

```
{
        return getUsedSafe(nullptr, i);
    }
    
    bool JoinUsedFlags::getUsedSafe(const Block * block_ptr, size_t row_idx) const
    {
        if (auto it = flags.find(block_ptr); it != flags.end())
            return it->second[row_idx].load();
        return !need_flags;
    }
    
    template <JoinKind KIND, JoinStrictness STRICTNESS>
    void JoinUsedFlags::reinit(size_t size)
    {
        if constexpr (MapGetter<KIND, STRICTNESS>::flagged)
        {
            assert(flags[nullptr].size() <= size);
            need_flags = true;
            flags[nullptr] = std::vector<std::atomic_bool>(size);
        }
    }
    
    template <JoinKind KIND, JoinStrictness STRICTNESS>
    void JoinUsedFlags::reinit(const Block * block_ptr)