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 (is_asof_join)
    {
        auto key_column_copy = key_columns;
        auto key_size_copy = key_sizes;
        key_column_copy.pop_back();
        key_size_copy.pop_back();
        return KeyGetter(key_column_copy, key_size_copy, nullptr);
    }
    else
        return KeyGetter(key_columns, key_sizes, nullptr);
}
template <typename Mapped, bool need_offset = false>
using FindResultImpl = ColumnsHashing::columns_hashing_impl::FindResultImpl<Mapped, true>;
template <typename Mapped>
class KeyGetterEmpty
{
public:
    struct MappedType
    {
        using mapped_type = Mapped;
    };
    using FindResult = ColumnsHashing::columns_hashing_impl::FindResultImpl<Mapped, true>;
    KeyGetterEmpty() = default;