X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/f4d3ae6f70e5f0e86475d75c79dd3cbe1c07e103..d231ff60ed94d2f9bd6cb6ebbad744a46ba56e8f:/lib-sql/tables.sql

diff --git a/lib-sql/tables.sql b/lib-sql/tables.sql
index 0958938a..17216b50 100644
--- a/lib-sql/tables.sql
+++ b/lib-sql/tables.sql
@@ -137,7 +137,9 @@ CREATE TABLE place_addressline (
   ) {{db.tablespace.search_data}};
 CREATE INDEX idx_place_addressline_place_id on place_addressline USING BTREE (place_id) {{db.tablespace.search_index}};
 
-drop table if exists placex;
+---------  PLACEX - storage for all indexed places -----------------
+
+DROP TABLE IF EXISTS placex;
 CREATE TABLE placex (
   place_id BIGINT NOT NULL,
   parent_place_id BIGINT,
@@ -157,25 +159,53 @@ CREATE TABLE placex (
   postcode TEXT,
   centroid GEOMETRY(Geometry, 4326)
   ) {{db.tablespace.search_data}};
+
 CREATE UNIQUE INDEX idx_place_id ON placex USING BTREE (place_id) {{db.tablespace.search_index}};
-CREATE INDEX idx_placex_node_osmid ON placex USING BTREE (osm_id) {{db.tablespace.search_index}} WHERE osm_type = 'N';
-CREATE INDEX idx_placex_way_osmid ON placex USING BTREE (osm_id) {{db.tablespace.search_index}} WHERE osm_type = 'W';
-CREATE INDEX idx_placex_relation_osmid ON placex USING BTREE (osm_id) {{db.tablespace.search_index}} WHERE osm_type = 'R';
-CREATE INDEX idx_placex_linked_place_id ON placex USING BTREE (linked_place_id) {{db.tablespace.address_index}} WHERE linked_place_id IS NOT NULL;
-CREATE INDEX idx_placex_geometry ON placex USING GIST (geometry) {{db.tablespace.search_index}};
+{% for osm_type in ('N', 'W', 'R') %}
+CREATE INDEX idx_placex_osmid_{{osm_type | lower}} ON placex
+  USING BTREE (osm_id) {{db.tablespace.search_index}}
+  WHERE osm_type = '{{osm_type}}';
+{% endfor %}
+
+-- Usage: - removing linkage status on update
+--        - lookup linked places for /details
+CREATE INDEX idx_placex_linked_place_id ON placex
+  USING BTREE (linked_place_id) {{db.tablespace.address_index}}
+  WHERE linked_place_id IS NOT NULL;
+
+-- Usage: - check that admin boundaries do not overtake each other rank-wise
+--        - check that place node in a admin boundary with the same address level
+--        - boundary is not completely contained in a place area
+--        - parenting of large-area or unparentable features
 CREATE INDEX idx_placex_geometry_address_area_candidates ON placex
   USING gist (geometry) {{db.tablespace.address_index}}
   WHERE rank_address between 1 and 25
         and ST_GeometryType(geometry) in ('ST_Polygon','ST_MultiPolygon');
+
+-- Usage: - POI is within building with housenumber
 CREATE INDEX idx_placex_geometry_buildings ON placex
   USING {{postgres.spgist_geom}} (geometry) {{db.tablespace.address_index}}
   WHERE address is not null and rank_search = 30
         and ST_GeometryType(geometry) in ('ST_Polygon','ST_MultiPolygon');
+
+-- Usage: - linking of similar named places to boundaries
+--        - linking of place nodes with same type to boundaries
 CREATE INDEX idx_placex_geometry_placenode ON placex
   USING {{postgres.spgist_geom}} (geometry) {{db.tablespace.address_index}}
   WHERE osm_type = 'N' and rank_search < 26
-        and class = 'place' and type != 'postcode' and linked_place_id is null;
-CREATE INDEX idx_placex_wikidata on placex USING BTREE ((extratags -> 'wikidata')) {{db.tablespace.address_index}} WHERE extratags ? 'wikidata' and class = 'place' and osm_type = 'N' and rank_search < 26;
+        and class = 'place' and type != 'postcode';
+
+-- Usage: - is node part of a way?
+--        - find parent of interpolation spatially
+CREATE INDEX idx_placex_geometry_lower_rank_ways ON placex
+  USING {{postgres.spgist_geom}} (geometry) {{db.tablespace.address_index}}
+  WHERE osm_type = 'W' and rank_search >= 26;
+
+-- Usage: - linking place nodes by wikidata tag to boundaries
+CREATE INDEX idx_placex_wikidata on placex
+  USING BTREE ((extratags -> 'wikidata')) {{db.tablespace.address_index}}
+  WHERE extratags ? 'wikidata' and class = 'place'
+        and osm_type = 'N' and rank_search < 26;
 
 -- The following two indexes function as a todo list for indexing.
 
@@ -245,7 +275,7 @@ CREATE SEQUENCE file start 1;
 
 -- null table so it won't error
 -- deliberately no drop - importing the table is expensive and static, if it is already there better to avoid removing it
-CREATE TABLE wikipedia_article (
+CREATE TABLE IF NOT EXISTS wikipedia_article (
     language text NOT NULL,
     title text NOT NULL,
     langcount integer,
@@ -259,15 +289,12 @@ CREATE TABLE wikipedia_article (
     wd_page_title text,
     instance_of text
 );
-ALTER TABLE ONLY wikipedia_article ADD CONSTRAINT wikipedia_article_pkey PRIMARY KEY (language, title);
-CREATE INDEX idx_wikipedia_article_osm_id ON wikipedia_article USING btree (osm_type, osm_id);
 
-CREATE TABLE wikipedia_redirect (
+CREATE TABLE IF NOT EXISTS wikipedia_redirect (
     language text,
     from_title text,
     to_title text
 );
-ALTER TABLE ONLY wikipedia_redirect ADD CONSTRAINT wikipedia_redirect_pkey PRIMARY KEY (language, from_title);
 
 -- osm2pgsql does not create indexes on the middle tables for Nominatim
 -- Add one for lookup of associated street relations.