CTEs always materialise so inline the union zoom level views ⚠️

schema/layers/boundary.sql

@@ -88,7 +88,7 @@ CREATE OR REPLACE VIEW boundary_z10 AS (
 
 CREATE OR REPLACE FUNCTION layer_boundary (bbox geometry, zoom_level int)
 RETURNS TABLE(geom geometry, admin_level int, scalerank int, class text) AS $$
-    WITH zoom_levels AS (
+    SELECT geom, admin_level, scalerank::int, class FROM (
         SELECT * FROM boundary_z0 WHERE zoom_level = 0
         UNION ALL
         SELECT * FROM boundary_z1 WHERE zoom_level BETWEEN 1 AND 2
@@ -118,7 +118,6 @@ RETURNS TABLE(geom geometry, admin_level int, scalerank int, class text) AS $$
         UNION ALL
         SELECT geom, admin_level, scalerank, class
         FROM boundary_z10 WHERE zoom_level >= 13
-    )
+    ) AS zoom_levels
-    SELECT geom, admin_level, scalerank::int, class FROM zoom_levels
     WHERE geom && bbox;
 $$ LANGUAGE SQL IMMUTABLE;

schema/layers/building.sql

@@ -8,16 +8,15 @@ CREATE OR REPLACE VIEW building_z14 AS (
 
 CREATE OR REPLACE FUNCTION layer_building(bbox geometry, zoom_level int)
 RETURNS TABLE(geom geometry, osm_id bigint, render_height float) AS $$
-    WITH zoom_levels AS (
+    SELECT way, osm_id,
+    least(greatest(3, COALESCE(height, levels*3.66,5)),400)^.7 AS render_height
+    FROM (
         SELECT osm_id, ST_Simplify(way, 10) AS way, height, levels FROM building_z13
         WHERE zoom_level = 13
         UNION ALL
         SELECT * FROM building_z14
         WHERE zoom_level >= 14
-    )
+    ) AS zoom_levels
-    SELECT way, osm_id,
-    least(greatest(3, COALESCE(height, levels*3.66,5)),400)^.7 AS render_height
-    FROM zoom_levels
     WHERE way && bbox
     ORDER BY render_height, ST_YMin(way) DESC;
 $$ LANGUAGE SQL IMMUTABLE;

schema/layers/country.sql

@@ -27,7 +27,7 @@ CREATE OR REPLACE VIEW country_z5 AS (
 
 CREATE OR REPLACE FUNCTION layer_country(bbox geometry, zoom_level int)
 RETURNS TABLE(geom geometry, name text, abbrev text, postal text, scalerank int, labelrank int) AS $$
-    WITH zoom_levels AS (
+    SELECT geom, name, abbrev, postal, scalerank::int, labelrank::int FROM (
         SELECT * FROM country_z1
         WHERE zoom_level = 1
         UNION ALL
@@ -39,8 +39,7 @@ RETURNS TABLE(geom geometry, name text, abbrev text, postal text, scalerank int,
         UNION ALL
         SELECT * FROM country_z5
         WHERE zoom_level >= 5
-    )
+    ) AS t
-    SELECT geom, name, abbrev, postal, scalerank::int, labelrank::int FROM zoom_levels
     WHERE geom && bbox
     ORDER BY scalerank, labelrank, length(name);
 $$ LANGUAGE SQL IMMUTABLE;

schema/layers/ice.sql

@@ -18,7 +18,7 @@ CREATE OR REPLACE VIEW ice_z5 AS (
 
 CREATE OR REPLACE FUNCTION layer_ice(bbox geometry, zoom_level int)
 RETURNS TABLE(geom geometry, class text) AS $$
-    WITH zoom_levels AS (
+    SELECT geom, type::text AS class FROM (
         SELECT ST_Simplify(geom, 80000) AS geom, type FROM ice_z0
         WHERE zoom_level BETWEEN 0 AND 1
         UNION ALL
@@ -27,7 +27,6 @@ RETURNS TABLE(geom geometry, class text) AS $$
         UNION ALL
         SELECT * FROM ice_z5
         WHERE zoom_level BETWEEN 5 AND 8
-    )
+    ) AS zoom_levels
-    SELECT geom, type::text AS class FROM zoom_levels
     WHERE geom && bbox;
 $$ LANGUAGE SQL IMMUTABLE;

schema/layers/place.sql

@@ -54,37 +54,7 @@ CREATE OR REPLACE VIEW place_z13 AS (
 
 CREATE OR REPLACE FUNCTION layer_place(bbox geometry, zoom_level int, pixel_width numeric)
 RETURNS TABLE(geom geometry, name text, class text, rank text, scalerank int) AS $$
-    WITH zoom_levels AS (
+    SELECT geom, name, class, rank::text, scalerank FROM (
-        SELECT * FROM place_z2
-        WHERE zoom_level = 2
-        UNION ALL
-        SELECT * FROM place_z3
-        WHERE zoom_level = 3
-        UNION ALL
-        SELECT * FROM place_z4
-        WHERE zoom_level = 4
-        UNION ALL
-        SELECT * FROM place_z5
-        WHERE zoom_level = 5
-        UNION ALL
-        SELECT * FROM place_z6
-        WHERE zoom_level = 6
-        UNION ALL
-        SELECT * FROM place_z7
-        WHERE zoom_level = 7
-        UNION ALL
-        SELECT * FROM place_z8
-        WHERE zoom_level BETWEEN 8 AND 9
-        UNION ALL
-        SELECT * FROM place_z10
-        WHERE zoom_level = 10
-        UNION ALL
-        SELECT * FROM place_z11
-        WHERE zoom_level BETWEEN 11 AND 12
-        UNION ALL
-        SELECT * FROM place_z13
-        WHERE zoom_level >= 13
-    ), ranked_places AS (
         SELECT geom, name, class, rank, scalerank,
         row_number() OVER (
             PARTITION BY LabelGrid(geom, 150 * pixel_width)
@@ -98,10 +68,39 @@ RETURNS TABLE(geom geometry, name text, class text, rank text, scalerank int) AS
             population DESC NULLS LAST,
             length(name) DESC
         ) AS gridrank
-        FROM zoom_levels
+        FROM (
+            SELECT * FROM place_z2
+            WHERE zoom_level = 2
+            UNION ALL
+            SELECT * FROM place_z3
+            WHERE zoom_level = 3
+            UNION ALL
+            SELECT * FROM place_z4
+            WHERE zoom_level = 4
+            UNION ALL
+            SELECT * FROM place_z5
+            WHERE zoom_level = 5
+            UNION ALL
+            SELECT * FROM place_z6
+            WHERE zoom_level = 6
+            UNION ALL
+            SELECT * FROM place_z7
+            WHERE zoom_level = 7
+            UNION ALL
+            SELECT * FROM place_z8
+            WHERE zoom_level BETWEEN 8 AND 9
+            UNION ALL
+            SELECT * FROM place_z10
+            WHERE zoom_level = 10
+            UNION ALL
+            SELECT * FROM place_z11
+            WHERE zoom_level BETWEEN 11 AND 12
+            UNION ALL
+            SELECT * FROM place_z13
+            WHERE zoom_level >= 13
+        ) AS zoom_levels
         WHERE geom && bbox
-    )
+    ) AS ranked_places
-    SELECT geom, name, class, rank::text, scalerank FROM ranked_places
     WHERE
         zoom_level <= 7 OR
         (zoom_level = 8 AND gridrank <= 4) OR

schema/layers/road.sql

@@ -124,6 +124,6 @@ RETURNS TABLE(geom geometry, class text) AS $$
         SELECT * FROM road_z13 WHERE zoom_level = 13
         UNION ALL
         SELECT * FROM road_z14 WHERE zoom_level >= 14
-    ) AS t
+    ) AS zoom_levels
     WHERE geom && bbox;
 $$ LANGUAGE SQL IMMUTABLE;

schema/layers/state.sql

@@ -29,16 +29,15 @@ CREATE OR REPLACE VIEW state_z4 AS (
 
 CREATE OR REPLACE FUNCTION layer_state(bbox geometry, zoom_level int)
 RETURNS TABLE(geom geometry, name text, name_en text, abbrev text, postal text, scalerank int, labelrank int) AS $$
-    WITH zoom_levels AS (
+    SELECT geom,
+    COALESCE(name_local, name_en) AS name_local, name_en,
+    abbrev, postal, scalerank::int, labelrank::int FROM (
         SELECT * FROM state_z3
         WHERE zoom_level = 3
         UNION ALL
         SELECT * FROM state_z4
         WHERE zoom_level >= 4
-    )
+    ) AS t
-    SELECT geom,
-    COALESCE(name_local, name_en) AS name_local, name_en,
-    abbrev, postal, scalerank::int, labelrank::int FROM zoom_levels
     WHERE geom && bbox
     ORDER BY scalerank ASC, labelrank ASC, shape_area DESC;
 $$ LANGUAGE SQL IMMUTABLE;

schema/layers/urban.sql

@@ -16,7 +16,7 @@ CREATE OR REPLACE VIEW urban_z6 AS (
 
 CREATE OR REPLACE FUNCTION layer_urban(bbox geometry, zoom_level int)
 RETURNS TABLE(geom geometry, scalerank int) AS $$
-    WITH zoom_levels AS (
+    SELECT geom, scalerank FROM (
         SELECT * FROM urban_z4
         WHERE zoom_level = 4
         UNION ALL
@@ -25,7 +25,6 @@ RETURNS TABLE(geom geometry, scalerank int) AS $$
         UNION ALL
         SELECT * FROM urban_z6
         WHERE zoom_level >= 6 AND scalerank-1 <= zoom_level
-    )
+    ) AS zoom_levels
-    SELECT geom, scalerank FROM zoom_levels
     WHERE geom && bbox;
 $$ LANGUAGE SQL IMMUTABLE;

schema/layers/water.sql

@@ -104,7 +104,7 @@ CREATE OR REPLACE VIEW water_z14 AS (
 
 CREATE OR REPLACE FUNCTION layer_water (bbox geometry, zoom_level int)
 RETURNS TABLE(geom geometry) AS $$
-    WITH zoom_levels AS (
+    SELECT geom FROM (
         SELECT * FROM water_z0
         WHERE zoom_level = 0
         UNION ALL
@@ -143,7 +143,6 @@ RETURNS TABLE(geom geometry) AS $$
         UNION ALL
         SELECT * FROM water_z14
         WHERE zoom_level >= 14
-    )
+    ) AS zoom_levels
-    SELECT geom FROM zoom_levels
     WHERE geom && bbox;
 $$ LANGUAGE SQL IMMUTABLE;