Adds first function for namedplaces #6

server/extension/sql/0.0.1/50_namedplaces.sql

@@ -0,0 +1,53 @@
+-- Interfacess of the server extension
+
+---- geocode_namedplace(city_name text)
+CREATE OR REPLACE FUNCTION geocode_namedplace(user_id name, tx_id bigint, city_name text)
+RETURNS Geometry AS $$
+    plpy.debug('Entering geocode_namedplace(city_name text)')
+    plpy.debug('user_id = %s' % user_id)
+
+    #-- Access control
+    #-- TODO: this should be part of cdb python library
+    if user_id == 'publicuser':
+        plpy.error('The api_key must be provided')
+
+    #--TODO: rate limiting check
+    #--TODO: quota check
+
+    #-- Copied from the doc, see http://www.postgresql.org/docs/9.4/static/plpython-database.html
+    plan = plpy.prepare("SELECT cdb_geocoder_server._geocode_namedplace($1) AS mypoint", ["text"])
+    rv = plpy.execute(plan, [city_name], 1)
+
+    plpy.debug('Returning from Returning from geocode_namedplace')
+    return rv[0]["mypoint"]
+$$ LANGUAGE plpythonu;
+
+---- geocode_admin1_polygons(admin1_name text, country_name text)
+
+--------------------------------------------------------------------------------
+
+-- Implementation of the server extension
+-- Note: these functions depend on the cdb_geocoder extension
+
+---- geocode_namedplace(city_name text)
+CREATE OR REPLACE FUNCTION _geocode_namedplace(city_name text)
+RETURNS Geometry AS $$
+  DECLARE
+    ret Geometry;
+  BEGIN
+  SELECT geom INTO ret
+  FROM (
+    WITH best AS (SELECT s AS q, (SELECT the_geom FROM global_cities_points_limited gp WHERE gp.lowername = lower(p.s) ORDER BY population DESC LIMIT 1) AS geom FROM (SELECT city_name as s) p),
+        next AS (SELECT p.s AS q, (SELECT gp.the_geom FROM global_cities_points_limited gp, global_cities_alternates_limited ga WHERE lower(p.s) = ga.lowername AND ga.geoname_id = gp.geoname_id ORDER BY preferred DESC LIMIT 1) geom FROM (SELECT city_name as s) p WHERE p.s NOT IN (SELECT q FROM best WHERE geom IS NOT NULL))
+        SELECT q, geom, TRUE AS success FROM best WHERE geom IS NOT NULL
+        UNION ALL
+        SELECT q, geom, CASE WHEN geom IS NULL THEN FALSE ELSE TRUE END AS success FROM next
+  ) v;
+
+    RETURN ret;
+  END
+$$ LANGUAGE plpgsql;
+
+---- geocode_namedplace(city_name text, country_name text)
+
+