Add mountain_peak layer

layers/mountain_peak/layer.sql

@@ -0,0 +1,23 @@
+CREATE OR REPLACE FUNCTION layer_mountain_peak(bbox geometry, zoom_level integer, pixel_width numeric)
+RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, ele int, ele_ft int, "rank" int) AS $$
+   -- etldoc: osm_housenumber_point -> layer_housenumber:z14_
+   SELECT osm_id, geometry, name, name_en, ele, ele_ft, rank
+   FROM (
+     SELECT osm_id, geometry, name, name_en,
+     substring(ele from E'^(-?\\d+)(\\D|$)')::int AS ele,
+     round(substring(ele from E'^(-?\\d+)(\\D|$)')::int*3.2808399) AS ele_ft,
+       row_number() OVER (
+           PARTITION BY LabelGrid(geometry, 100 * pixel_width)
+           ORDER BY (
+             substring(ele from E'^(-?\\d+)(\\D|$)')::int +
+             (CASE WHEN length(NULLIF(wikipedia, '')) > 0 THEN 10000 ELSE 0 END) +
+             (CASE WHEN length(NULLIF(name, '')) > 0 THEN 10000 ELSE 0 END)
+           ) DESC
+       )::int AS "rank"
+     FROM osm_peak_point
+     WHERE geometry && bbox AND ele is not null AND ele ~ E'^-?\\d+'
+   ) AS ranked_peaks
+   WHERE zoom_level >= 7 AND (rank <= 5 OR zoom_level >= 14)
+   ORDER BY "rank" ASC;
+
+$$ LANGUAGE SQL IMMUTABLE;