Initial attempt at moving forests with names into their own 'landmarks' layer. (this is heavely copied and pasted from POI)

layers/landmarks/layer.sql

@@ -0,0 +1,90 @@
+-- etldoc: layer_lm[shape=record fillcolor=lightpink, style="rounded,filled",
+-- etldoc:     label="layer_lm | <z12> z12 | <z13> z13 | <z14_> z14+" ] ;
+
+CREATE OR REPLACE FUNCTION layer_lm(bbox geometry, zoom_level integer, pixel_width numeric)
+    RETURNS TABLE
+            (
+                osm_id   bigint,
+                geometry geometry,
+                name     text,
+                name_en  text,
+                name_de  text,
+                tags     hstore,
+                class    text,
+                subclass text,
+                agg_stop integer,
+                layer    integer,
+                level    integer,
+                indoor   integer,
+                "rank"   int
+            )
+AS
+$$
+SELECT osm_id_hash                                  AS osm_id,
+       geometry,
+       NULLIF(name, '')                             AS name,
+       COALESCE(NULLIF(name_en, ''), name)          AS name_en,
+       COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
+       tags,
+       lm_class(subclass, mapping_key)             AS class,
+       subclass                                      AS subclass,
+       agg_stop,
+       NULLIF(layer, 0)                             AS layer,
+       "level",
+       row_number() OVER (
+           PARTITION BY LabelGrid(geometry, 100 * pixel_width)
+           ORDER BY CASE WHEN name = '' THEN 2000 ELSE lm_class_rank(lm_class(subclass, mapping_key)) END ASC
+           )::int                                   AS "rank"
+FROM (
+         -- etldoc: osm_lm_point ->  layer_lm:z12
+         -- etldoc: osm_lm_point ->  layer_lm:z13
+         SELECT *,
+                osm_id * 10 AS osm_id_hash
+         FROM osm_lm_point
+         WHERE geometry && bbox
+           AND zoom_level BETWEEN 12 AND 13
+           AND ((subclass = 'station' AND mapping_key = 'railway')
+             OR subclass IN ('halt', 'ferry_terminal'))
+
+         UNION ALL
+
+         -- etldoc: osm_lm_point ->  layer_lm:z14_
+         SELECT *,
+                osm_id * 10 AS osm_id_hash
+         FROM osm_lm_point
+         WHERE geometry && bbox
+           AND zoom_level >= 14
+
+         UNION ALL
+
+         -- etldoc: osm_lm_polygon ->  layer_lm:z12
+         -- etldoc: osm_lm_polygon ->  layer_lm:z13
+         SELECT *,
+                NULL::integer AS agg_stop,
+                CASE
+                    WHEN osm_id < 0 THEN -osm_id * 10 + 4
+                    ELSE osm_id * 10 + 1
+                    END       AS osm_id_hash
+         FROM osm_lm_polygon
+         WHERE geometry && bbox
+           AND zoom_level BETWEEN 12 AND 13
+           AND ((subclass = 'station' AND mapping_key = 'railway')
+             OR subclass IN ('halt', 'ferry_terminal'))
+
+         UNION ALL
+
+         -- etldoc: osm_lm_polygon ->  layer_lm:z14_
+         SELECT *,
+                NULL::integer AS agg_stop,
+                CASE
+                    WHEN osm_id < 0 THEN -osm_id * 10 + 4
+                    ELSE osm_id * 10 + 1
+                    END       AS osm_id_hash
+         FROM osm_lm_polygon
+         WHERE geometry && bbox
+           AND zoom_level >= 14
+     ) AS lm_union
+ORDER BY "rank"
+$$ LANGUAGE SQL STABLE
+                PARALLEL SAFE;
+-- TODO: Check if the above can be made STRICT -- i.e. if pixel_width could be NULL