Add agg_stop indicator to transit stations (POI)

layers/poi/poi_stop_agg.sql

@@ -0,0 +1,39 @@
+DROP MATERIALIZED VIEW IF EXISTS osm_poi_stop_centroid CASCADE;
+CREATE MATERIALIZED VIEW osm_poi_stop_centroid AS (
+  SELECT
+      uic_ref,
+      count(*) as count,
+			CASE WHEN count(*) > 2 THEN ST_Centroid(ST_UNION(geometry))
+			ELSE NULL END AS centroid
+  FROM osm_poi_point
+	WHERE
+		nullif(uic_ref, '') IS NOT NULL
+		AND subclass IN ('bus_stop', 'bus_station', 'tram_stop', 'subway')
+	GROUP BY
+		uic_ref
+	HAVING
+		count(*) > 1
+);
+
+DROP MATERIALIZED VIEW IF EXISTS osm_poi_stop_rank CASCADE;
+CREATE MATERIALIZED VIEW osm_poi_stop_rank AS (
+	SELECT
+		p.osm_id,
+-- 		p.uic_ref,
+-- 		p.subclass,
+		ROW_NUMBER()
+		OVER (
+			PARTITION BY p.uic_ref
+			ORDER BY
+				p.subclass :: public_transport_stop_type NULLS LAST,
+				ST_Distance(c.centroid, p.geometry)
+		) AS rk
+	FROM osm_poi_point p
+		INNER JOIN osm_poi_stop_centroid c ON (p.uic_ref = c.uic_ref)
+	WHERE
+		subclass IN ('bus_stop', 'bus_station', 'tram_stop', 'subway')
+	ORDER BY p.uic_ref, rk
+);
+
+ALTER TABLE osm_poi_point ADD COLUMN IF NOT EXISTS agg_stop INTEGER DEFAULT NULL;
+SELECT update_osm_poi_point_agg();