osm-search/Nominatim
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do not use index when searching in large areas

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This concerns viewboxes as well as radius search.
This commit is contained in:
Sarah Hoffmann 2023-08-12 16:12:44 +02:00
parent fa3ac22a8f
commit cab2a74740
4 changed files with 22 additions and 4 deletions
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7
nominatim/api/search/db_searches.py
View File

@ -622,7 +622,10 @@ class PlaceSearch(AbstractSearch):
if details.viewbox is not None:
if details.bounded_viewbox:
if details.viewbox.area < 0.2:
sql = sql.where(tsearch.c.centroid.intersects(VIEWBOX_PARAM))
else:
sql = sql.where(tsearch.c.centroid.ST_Intersects_no_index(VIEWBOX_PARAM))
else:
penalty += sa.case((t.c.geometry.intersects(VIEWBOX_PARAM), 0.0),
(t.c.geometry.intersects(VIEWBOX2_PARAM), 1.0),
@ -630,7 +633,11 @@ class PlaceSearch(AbstractSearch):
if details.near is not None:
if details.near_radius is not None:
if details.near_radius < 0.1:
sql = sql.where(tsearch.c.centroid.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM))
else:
sql = sql.where(tsearch.c.centroid.ST_DWithin_no_index(NEAR_PARAM,
NEAR_RADIUS_PARAM))
sql = sql.add_columns(-tsearch.c.centroid.ST_Distance(NEAR_PARAM)
.label('importance'))
sql = sql.order_by(sa.desc(sa.text('importance')))

3
nominatim/api/search/geocoder.py
View File

@ -152,7 +152,8 @@ class ForwardGeocoder:
# pylint: disable=invalid-name,too-many-locals
def _dump_searches(searches: List[AbstractSearch], query: QueryStruct,
start: int = 0) -> Iterator[Optional[List[Any]]]:
yield ['Penalty', 'Lookups', 'Housenr', 'Postcode', 'Countries', 'Qualifier', 'Catgeory', 'Rankings']
yield ['Penalty', 'Lookups', 'Housenr', 'Postcode', 'Countries',
'Qualifier', 'Catgeory', 'Rankings']
def tk(tl: List[int]) -> str:
tstr = [f"{query.find_lookup_word_by_id(t)}({t})" for t in tl]

2
nominatim/api/search/token_assignment.py
View File

@ -253,6 +253,8 @@ class _TokenSequence:
priors = sum(1 for t in self.seq[hnrpos+1:] if t.ttype == qmod.TokenType.PARTIAL)
if not self._adapt_penalty_from_priors(priors, 1):
return False
if any(t.ttype == qmod.TokenType.CATEGORY for t in self.seq):
self.penalty += 1.0
return True

10
nominatim/db/sqlalchemy_types.py
View File

@ -66,7 +66,15 @@ class Geometry(types.UserDefinedType): # type: ignore[type-arg]
def ST_DWithin(self, other: SaColumn, distance: SaColumn) -> SaColumn:
return sa.func.ST_DWithin(self, other, distance, type_=sa.Float)
return sa.func.ST_DWithin(self, other, distance, type_=sa.Boolean)
def ST_DWithin_no_index(self, other: SaColumn, distance: SaColumn) -> SaColumn:
return sa.func._ST_DWithin(self, other, distance, type_=sa.Boolean)
def ST_Intersects_no_index(self, other: SaColumn) -> SaColumn:
return sa.func._ST_Intersects(self, other, type_=sa.Boolean)
def ST_Distance(self, other: SaColumn) -> SaColumn: