consolidate indexes over geometry_sectors

The index over geometry_sectors are mainly used for ordering
the places which need indexing. That means they function effectively
as a TODO list. Consolodate them so that they always only contain
the places which are still to do. Also add the appropriate index
for the boundary indexing phase.

lib-sql/indices.sql

@@ -5,6 +5,13 @@
 -- Copyright (C) 2022 by the Nominatim developer community.
 -- For a full list of authors see the git log.
 
+-- The following indicies are only useful during imoprt when all of placex is processed.
+
+{% if drop %}
+  DROP INDEX IF EXISTS idx_placex_rank_address_sector;
+  DROP INDEX IF EXISTS idx_placex_rank_boundaries_sector;
+{% endif %}
+
 -- Indices used only during search and update.
 -- These indices are created only after the indexing process is done.
 
@@ -39,10 +46,6 @@ CREATE INDEX IF NOT EXISTS idx_postcode_postcode
 -- Indices only needed for updating.
 
 {% if not drop %}
----
-  CREATE INDEX IF NOT EXISTS idx_placex_pendingsector
-    ON placex USING BTREE (rank_address,geometry_sector) {{db.tablespace.address_index}}
-    WHERE indexed_status > 0;
 ---
   CREATE INDEX IF NOT EXISTS idx_location_area_country_place_id
     ON location_area_country USING BTREE (place_id) {{db.tablespace.address_index}};

lib-sql/tables.sql

@@ -162,7 +162,6 @@ CREATE INDEX idx_placex_node_osmid ON placex USING BTREE (osm_id) {{db.tablespac
 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_rank_search ON placex USING BTREE (rank_search, geometry_sector) {{db.tablespace.address_index}};
 CREATE INDEX idx_placex_geometry ON placex USING GIST (geometry) {{db.tablespace.search_index}};
 CREATE INDEX idx_placex_geometry_address_area_candidates ON placex
   USING gist (geometry) {{db.tablespace.address_index}}
@@ -178,6 +177,18 @@ CREATE INDEX idx_placex_geometry_placenode ON placex
         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;
 
+-- The following two indexes function as a todo list for indexing.
+
+CREATE INDEX idx_placex_rank_address_sector ON placex
+  USING BTREE (rank_address, geometry_sector) {{db.tablespace.address_index}}
+  WHERE indexed_status > 0;
+
+CREATE INDEX idx_placex_rank_boundaries_sector ON placex
+  USING BTREE (rank_search, geometry_sector) {{db.tablespace.address_index}}
+  WHERE class = 'boundary' and type = 'administrative'
+        and indexed_status > 0;
+
+
 DROP SEQUENCE IF EXISTS seq_place;
 CREATE SEQUENCE seq_place start 1;
 GRANT SELECT on placex to "{{config.DATABASE_WEBUSER}}" ;

nominatim/clicmd/setup.py

@@ -15,7 +15,7 @@ from pathlib import Path
 import psutil
 
 from nominatim.config import Configuration
-from nominatim.db.connection import connect, Connection
+from nominatim.db.connection import connect
 from nominatim.db import status, properties
 from nominatim.tokenizer.base import AbstractTokenizer
 from nominatim.version import version_str
@@ -122,9 +122,6 @@ class SetupAll:
                                        args.project_dir, tokenizer)
 
         if args.continue_at is None or args.continue_at in ('load-data', 'indexing'):
-            if args.continue_at is not None and args.continue_at != 'load-data':
-                with connect(args.config.get_libpq_dsn()) as conn:
-                    self._create_pending_index(conn, args.config.TABLESPACE_ADDRESS_INDEX)
             LOG.warning('Indexing places')
             indexer = Indexer(args.config.get_libpq_dsn(), tokenizer, num_threads)
             indexer.index_full(analyse=not args.index_noanalyse)
@@ -189,27 +186,6 @@ class SetupAll:
         return tokenizer_factory.get_tokenizer_for_db(config)
 
 
-    def _create_pending_index(self, conn: Connection, tablespace: str) -> None:
-        """ Add a supporting index for finding places still to be indexed.
-
-            This index is normally created at the end of the import process
-            for later updates. When indexing was partially done, then this
-            index can greatly improve speed going through already indexed data.
-        """
-        if conn.index_exists('idx_placex_pendingsector'):
-            return
-
-        with conn.cursor() as cur:
-            LOG.warning('Creating support index')
-            if tablespace:
-                tablespace = 'TABLESPACE ' + tablespace
-            cur.execute(f"""CREATE INDEX idx_placex_pendingsector
-                            ON placex USING BTREE (rank_address,geometry_sector)
-                            {tablespace} WHERE indexed_status > 0
-                         """)
-        conn.commit()
-
-
     def _finalize_database(self, dsn: str, offline: bool) -> None:
         """ Determine the database date and set the status accordingly.
         """

nominatim/tools/check_database.py

@@ -114,9 +114,10 @@ def _get_indexes(conn: Connection) -> List[str]:
             indexes.extend(('idx_placex_housenumber',
                             'idx_osmline_parent_osm_id_with_hnr'))
     if conn.table_exists('place'):
-        indexes.extend(('idx_placex_pendingsector',
-                        'idx_location_area_country_place_id',
-                        'idx_place_osm_unique'))
+        indexes.extend(('idx_location_area_country_place_id',
+                        'idx_place_osm_unique',
+                        'idx_placex_rank_address_sector',
+                        'idx_placex_rank_boundaries_sector'))
 
     return indexes
 
@@ -199,7 +200,7 @@ def check_tokenizer(_: Connection, config: Configuration) -> CheckResult:
 def check_existance_wikipedia(conn: Connection, _: Configuration) -> CheckResult:
     """ Checking for wikipedia/wikidata data
     """
-    if not conn.table_exists('search_name'):
+    if not conn.table_exists('search_name') or not conn.table_exists('place'):
         return CheckState.NOT_APPLICABLE
 
     with conn.cursor() as cur:

test/python/cli/test_cmd_import.py

@@ -105,11 +105,8 @@ class TestCliImportWithDb:
         for mock in mocks:
             assert mock.called == 1, "Mock '{}' not called".format(mock.func_name)
 
-        assert temp_db_conn.index_exists('idx_placex_pendingsector')
-
         # Calling it again still works for the index
         assert self.call_nominatim('import', '--continue', 'indexing') == 0
-        assert temp_db_conn.index_exists('idx_placex_pendingsector')
 
 
     def test_import_continue_postprocess(self, mock_func_factory):