```
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:
```
{
    const auto * ptr_points = typeid_cast<const ColumnTuple*>(column);
    if (!ptr_points)
        throw Exception{"Expected a column of tuples representing points", ErrorCodes::TYPE_MISMATCH};
    if (ptr_points->tupleSize() != 2)
        throw Exception{"Points should be two-dimensional", ErrorCodes::BAD_ARGUMENTS};
    const auto * column_x = typeid_cast<const ColumnVector<Float64>*>(&ptr_points->getColumn(0));
    const auto * column_y = typeid_cast<const ColumnVector<Float64>*>(&ptr_points->getColumn(1));
    if (!column_x || !column_y)
        throw Exception{"Expected coordinates to be of type Float64", ErrorCodes::TYPE_MISMATCH};
    for (size_t i = 0; i < column_x->size(); ++i)
    {
        addNewPoint(column_x->getElement(i), column_y->getElement(i), data, offset);
    }
}
}
void IPolygonDictionary::extractPolygons(const ColumnPtr & column)