openmaptiles/layers/transportation/network_type.sql

DROP TRIGGER IF EXISTS trigger_store_transportation_route_member ON osm_route_member;
DROP TRIGGER IF EXISTS trigger_store_transportation_highway_linestring ON osm_highway_linestring;
DROP TRIGGER IF EXISTS trigger_flag_transportation_name ON transportation_name.network_changes;
DROP TRIGGER IF EXISTS trigger_refresh_network ON transportation_name.updates_network;

DROP TRIGGER IF EXISTS trigger_store_transportation_name_network ON osm_transportation_name_network;
DROP TRIGGER IF EXISTS trigger_flag_name ON transportation_name.name_changes;
DROP TRIGGER IF EXISTS trigger_refresh_name ON transportation_name.updates_name;

DO
$$
    BEGIN
        PERFORM 'route_network_type'::regtype;
    EXCEPTION
        WHEN undefined_object THEN
            CREATE TYPE route_network_type AS enum (
                'us-interstate', 'us-highway', 'us-state',
                'ca-transcanada', 'ca-provincial-arterial', 'ca-provincial',
                'gb-motorway', 'gb-trunk', 'gb-primary'
                );
    END
$$;

-- Top-level national route networks that should display at the lowest zooms
CREATE OR REPLACE FUNCTION osm_national_network(network text) RETURNS boolean AS
$$
    SELECT network <> '' AND network IN (
        -- Canada
        'ca-transcanada', 'ca-provincial-arterial',
        -- United States
        'us-interstate');
$$ LANGUAGE sql IMMUTABLE
                PARALLEL SAFE;

DO
$$
    BEGIN
        BEGIN
            ALTER TABLE osm_route_member
                ADD COLUMN network_type route_network_type;
        EXCEPTION
            WHEN duplicate_column THEN RAISE NOTICE 'column network_type already exists in network_type.';
        END;
    END;
$$;