```
SELECT *
FROM system.dictionaries
WHERE name LIKE 'XXXX%'

Row 1:
──────
database:                    default
name:                        XXXX_dict
uuid:                        00000000-0000-0000-0000-000000000000
status:                      LOADED
origin:                      default.XXXX_dict
type:                        Polygon
key:                         (Array(Array(Array(Array(Float64)))))
attribute.names:             ['name','id']
attribute.types:             ['String','String']
bytes_allocated:             0
query_count:                 0
hit_rate:                    1
element_count:               433731
load_factor:                 1
source:                      ClickHouse: default.XXXX
lifetime_min:                60
lifetime_max:                1800
loading_start_time:          2021-03-11 00:07:52
last_successful_update_time: 2021-03-11 00:08:24
loading_duration:            31.595
last_exception:
```
{
    attributes.resize(dict_struct.attributes.size());
    for (size_t i = 0; i < dict_struct.attributes.size(); ++i)
    {
        const auto & attr = dict_struct.attributes[i];
        attribute_index_by_name.emplace(attr.name, i);
        appendNullValue(attr.underlying_type, attr.null_value);
        if (attr.hierarchical)
            throw Exception{ErrorCodes::TYPE_MISMATCH,
                            "{}: hierarchical attributes not supported for dictionary of polygonal type",
                            getDictionaryID().getNameForLogs()};
    }
}
void IPolygonDictionary::blockToAttributes(const DB::Block & block)