```
create table default.test_parent
(
    id        UInt64,
    parent_id Nullable(UInt64)
) engine = MergeTree

create dictionary default.d4test_parent
    ( id UInt64,
    parent_id  Nullable(UInt64) HIERARCHICAL
    )
    PRIMARY KEY id
    SOURCE (CLICKHOUSE(DB 'default' TABLE 'test_parent'))
    LIFETIME (MIN 0 MAX 0)
    LAYOUT (HASHED)
;
insert into default.test_parent
values (1, null),
       (2, 3),
       (3, 1),
       (4, 2)
;
system reload dictionary default.d4test_parent
;
select dictGetDescendants('default.d4test_parent', toUInt64(2))
;
```

Code: 53. DB::Exception: default.d4test_parent (443f6664-e217-44ec-80e2-bbec982b4963): type mismatch: column has wrong type expected UInt64: While processing dictGetDescendants('default.d4test_parent', 2). (TYPE_MISMATCH) (version 22.3.2.1)


On old versions no errors
```
select version()
-- 21.11.6.7
;
select dictGetDescendants('default.d4test_parent', toUInt64(2))
-- [4]
```
const std::string & config_prefix,
                            DictionarySourcePtr source_ptr,
                            ContextPtr ,
                            bool ) -> DictionaryPtr
    {
        if (dict_struct.key)
            throw Exception(ErrorCodes::UNSUPPORTED_METHOD, "'key' is not supported for dictionary of layout 'flat'");
        if (dict_struct.range_min || dict_struct.range_max)
            throw Exception(ErrorCodes::BAD_ARGUMENTS,
                            "{}: elements .structure.range_min and .structure.range_max should be defined only "
                            "for a dictionary of layout 'range_hashed'",
                            full_name);
        static constexpr size_t default_initial_array_size = 1024;
        static constexpr size_t default_max_array_size = 500000;
        String dictionary_layout_prefix = config_prefix + ".layout" + ".flat";
        const DictionaryLifetime dict_lifetime{config, config_prefix + ".lifetime"};
        FlatDictionary::Configuration configuration
        {
            .initial_array_size = config.getUInt64(dictionary_layout_prefix + ".initial_array_size", default_initial_array_size),
            .max_array_size = config.getUInt64(dictionary_layout_prefix + ".max_array_size", default_max_array_size),
            .require_nonempty = config.getBool(config_prefix + ".require_nonempty", false),
            .dict_lifetime = dict_lifetime
        };
        const auto dict_id = StorageID::fromDictionaryConfig(config, config_prefix);
        return std::make_unique<FlatDictionary>(dict_id, dict_struct, std::move(source_ptr), configuration);
    };
    factory.registerLayout("flat", create_layout, false);
}
}