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;

```
const std::vector<const Maps *> & mapv,
    AddedColumns & added_columns,
    HashJoin::Type type,
    JoinStuff::JoinUsedFlags & used_flags)
{
    constexpr bool is_asof_join = STRICTNESS == JoinStrictness::Asof;
    switch (type)
    {
        case HashJoin::Type::EMPTY:
        {
            if constexpr (!is_asof_join)
            {
                using KeyGetter = KeyGetterEmpty<typename Maps::MappedType>;
                std::vector<KeyGetter> key_getter_vector;
                key_getter_vector.emplace_back();
                using MapTypeVal = typename KeyGetter::MappedType;
                std::vector<const MapTypeVal *> a_map_type_vector;
                a_map_type_vector.emplace_back();