```
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:
```
{
public:
    SlabsPolygonIndex() = default;
    
    SlabsPolygonIndex(const std::vector<Polygon> & polygons);
    
    bool find(const Point & point, size_t & id) const;
    /** Edge describes edge (adjacent points) of any polygon, and contains polygon's id.
      * Invariant here is first point has x not greater than second point.
      */
    struct Edge
    {
        Point l;
        Point r;
        size_t polygon_id;
        size_t edge_id;
        Coord k;
        Coord b;
        Edge(const Point & l, const Point & r, size_t polygon_id, size_t edge_id);
        static bool compareByLeftPoint(const Edge & a, const Edge & b);
        static bool compareByRightPoint(const Edge & a, const Edge & b);
    };
    
    struct EdgeLine
    {
        explicit EdgeLine(const Edge & e): k(e.k), b(e.b), polygon_id(e.polygon_id) {}