CTEs always materialise so inline the union zoom level views ⚠️

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