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

layers/landmarks/class.sql

@@ -0,0 +1,19 @@
+CREATE OR REPLACE FUNCTION lm_class_rank(class text)
+    RETURNS int AS
+$$
+SELECT CASE class
+           WHEN 'forest' THEN 120
+           ELSE 1000
+           END;
+$$ LANGUAGE SQL IMMUTABLE
+                PARALLEL SAFE;
+
+CREATE OR REPLACE FUNCTION lm_class(subclass text, mapping_key text)
+    RETURNS text AS
+$$
+SELECT CASE
+           %%FIELD_MAPPING: class %%
+           ELSE subclass
+           END;
+$$ LANGUAGE SQL IMMUTABLE
+                PARALLEL SAFE;