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speed up reverse lookup of place nodes

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Add a special index that contains the place nodes buffered by their
respective area according to their search rank. This replaces the
maximum area search for place nodes and reduces drastically the number
of place nodes that need to be retrieved.
This commit is contained in:
Sarah Hoffmann
2023-02-17 10:31:49 +01:00
parent 3405dbf90e
commit 8ed096f938
5 changed files with 29 additions and 14 deletions
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16
nominatim/tools/migration.py
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@@ -48,7 +48,8 @@ def migrate(config: Configuration, paths: Any) -> int:
has_run_migration = False
for version, func in _MIGRATION_FUNCTIONS:
if db_version <= version:
if db_version < version or \
(db_version == (3, 5, 0, 99) and version == (3, 5, 0, 99)):
title = func.__doc__ or ''
LOG.warning("Running: %s (%s)", title.split('\n', 1)[0], version)
kwargs = dict(conn=conn, config=config, paths=paths)
@@ -371,3 +372,16 @@ def enable_forward_dependencies(conn: Connection, **_: Any) -> None:
ON planet_osm_rels USING gin (parts)
WITH (fastupdate=off)""")
cur.execute("ANALYZE planet_osm_ways")
@_migration(4, 2, 99, 1)
def add_improved_geometry_reverse_placenode_index(conn: Connection, **_: Any) -> None:
""" Create improved index for reverse lookup of place nodes.
"""
with conn.cursor() as cur:
cur.execute("""CREATE INDEX IF NOT EXISTS idx_placex_geometry_reverse_lookupPlaceNode
ON placex
USING gist (ST_Buffer(geometry, reverse_place_diameter(rank_search)))
WHERE rank_address between 4 and 25 AND type != 'postcode'
AND name is not null AND linked_place_id is null AND osm_type = 'N'
""")

2
nominatim/version.py
View File

@@ -34,7 +34,7 @@ class NominatimVersion(NamedTuple):
return f"{self.major}.{self.minor}.{self.patch_level}-{self.db_patch_level}"
NOMINATIM_VERSION = NominatimVersion(4, 2, 99, 0)
NOMINATIM_VERSION = NominatimVersion(4, 2, 99, 1)
POSTGRESQL_REQUIRED_VERSION = (9, 6)
POSTGIS_REQUIRED_VERSION = (2, 2)