use "char" type when refering to osm_type column

When using an explicit cast to char(1) when refering to the
osm_type column postgres won't use the index in some cases.
Observed only on postgres 9.5 from the original Postgres
reporsitories.

Fixes #741.

diff --git a/sql/functions.sql b/sql/functions.sql
index b60ef97facea5b10285598affea2258b601541ef..6cc4280344eab72da713d00ea5e9d263c2577fa4 100644 (file)
--- a/sql/functions.sql
+++ b/sql/functions.sql
@@ -1491,7 +1491,7 @@ BEGIN
     IF relation_members IS NOT NULL THEN
       FOR relMember IN select get_osm_rel_members(relation_members,ARRAY['label']) as member LOOP
 
-        FOR linkedPlacex IN select * from placex where osm_type = upper(substring(relMember.member,1,1))::char(1) 
+        FOR linkedPlacex IN select * from placex where osm_type = upper(substring(relMember.member,1,1))::"char"
           and osm_id = substring(relMember.member,2,10000)::bigint order by rank_search desc limit 1 LOOP
 
           -- If we don't already have one use this as the centre point of the geometry
@@ -1522,7 +1522,7 @@ BEGIN
 
         FOR relMember IN select get_osm_rel_members(relation_members,ARRAY['admin_center','admin_centre']) as member LOOP
 
-          FOR linkedPlacex IN select * from placex where osm_type = upper(substring(relMember.member,1,1))::char(1) 
+          FOR linkedPlacex IN select * from placex where osm_type = upper(substring(relMember.member,1,1))::"char"
             and osm_id = substring(relMember.member,2,10000)::bigint order by rank_search desc limit 1 LOOP
 
             -- For an admin centre we also want a name match - still not perfect, for example 'new york, new york'
@@ -1571,7 +1571,7 @@ BEGIN
         make_standard_name(name->'name') = make_standard_name(NEW.name->'name')
         AND placex.rank_address = NEW.rank_address
         AND placex.place_id != NEW.place_id
-        AND placex.osm_type = 'N'::char(1) AND placex.rank_search < 26
+        AND placex.osm_type = 'N' AND placex.rank_search < 26
         AND st_covers(NEW.geometry, placex.geometry)
       LOOP
 
@@ -1621,7 +1621,7 @@ BEGIN
 
     -- Still null? how about looking it up by the node id
     IF NEW.importance IS NULL THEN
-      select language||':'||title,importance from wikipedia_article where osm_type = 'N'::char(1) and osm_id = linked_node_id order by importance desc limit 1 INTO NEW.wikipedia,NEW.importance;
+      select language||':'||title,importance from wikipedia_article where osm_type = 'N' and osm_id = linked_node_id order by importance desc limit 1 INTO NEW.wikipedia,NEW.importance;
     END IF;
 
   END IF;