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;

```
if constexpr (has_null_map)
            {
                if (join_keys.null_map && (*join_keys.null_map)[i])
                {
                    null_element_found = true;
                    continue;
                }
            }
            bool row_acceptable = !join_keys.isRowFiltered(i);
            using FindResult = typename KeyGetter::FindResult;
            auto find_result = row_acceptable ? key_getter_vector[onexpr_idx].findKey(*(mapv[onexpr_idx]), i, pool) : FindResult();
            if (find_result.isFound())
            {
                right_row_found = true;
                auto & mapped = find_result.getMapped();
                if constexpr (jf.is_asof_join)
                {
                    const IColumn & left_asof_key = added_columns.leftAsofKey();
                    auto row_ref = mapped->findAsof(left_asof_key, i);
                    if (row_ref.block)
                    {
                        setUsed<need_filter>(filter, i);
                        if constexpr (multiple_disjuncts)
                            used_flags.template setUsed<jf.need_flags, multiple_disjuncts>(row_ref.block, row_ref.row_num, 0);
                        else
                            used_flags.template setUsed<jf.need_flags, multiple_disjuncts>(find_result);
                        added_columns.appendFromBlock<jf.add_missing>(*row_ref.block, row_ref.row_num);
                    }
                    else
                        addNotFoundRow<jf.add_missing, jf.need_replication>(added_columns, current_offset);