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clean up ST_DWithin and intersects() functions

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A non-index version of ST_DWithin is not necessary. ST_Distance
can be used for that purpose. Index use for intersects can be
covered with a simple parameter.
This commit is contained in:
Sarah Hoffmann
2023-12-05 18:02:40 +01:00
parent c41f2fed21
commit 615b166c68
3 changed files with 28 additions and 51 deletions
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8
nominatim/api/reverse.py
View File

@@ -180,7 +180,7 @@ class ReverseGeocoder:
diststr = sa.text(f"{distance}")
sql: SaLambdaSelect = sa.lambda_stmt(lambda: _select_from_placex(t)
.where(t.c.geometry.ST_DWithin(WKT_PARAM, diststr))
.where(t.c.geometry.within_distance(WKT_PARAM, diststr))
.where(t.c.indexed_status == 0)
.where(t.c.linked_place_id == None)
.where(sa.or_(sa.not_(t.c.geometry.is_area()),
@@ -219,7 +219,7 @@ class ReverseGeocoder:
t = self.conn.t.placex
sql: SaLambdaSelect = sa.lambda_stmt(lambda: _select_from_placex(t)
.where(t.c.geometry.ST_DWithin(WKT_PARAM, 0.001))
.where(t.c.geometry.within_distance(WKT_PARAM, 0.001))
.where(t.c.parent_place_id == parent_place_id)
.where(sa.func.IsAddressPoint(t))
.where(t.c.indexed_status == 0)
@@ -241,7 +241,7 @@ class ReverseGeocoder:
sa.select(t,
t.c.linegeo.ST_Distance(WKT_PARAM).label('distance'),
_locate_interpolation(t))
.where(t.c.linegeo.ST_DWithin(WKT_PARAM, distance))
.where(t.c.linegeo.within_distance(WKT_PARAM, distance))
.where(t.c.startnumber != None)
.order_by('distance')
.limit(1))
@@ -275,7 +275,7 @@ class ReverseGeocoder:
inner = sa.select(t,
t.c.linegeo.ST_Distance(WKT_PARAM).label('distance'),
_locate_interpolation(t))\
.where(t.c.linegeo.ST_DWithin(WKT_PARAM, 0.001))\
.where(t.c.linegeo.within_distance(WKT_PARAM, 0.001))\
.where(t.c.parent_place_id == parent_place_id)\
.order_by('distance')\
.limit(1)\

37
nominatim/api/search/db_searches.py
View File

@@ -56,7 +56,7 @@ NEAR_RADIUS_PARAM: SaBind = sa.bindparam('near_radius')
COUNTRIES_PARAM: SaBind = sa.bindparam('countries')
def _within_near(t: SaFromClause) -> Callable[[], SaExpression]:
return lambda: t.c.geometry.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM)
return lambda: t.c.geometry.within_distance(NEAR_PARAM, NEAR_RADIUS_PARAM)
def _exclude_places(t: SaFromClause) -> Callable[[], SaExpression]:
return lambda: t.c.place_id.not_in(sa.bindparam('excluded'))
@@ -366,7 +366,7 @@ class PoiSearch(AbstractSearch):
.add_columns((-t.c.centroid.ST_Distance(NEAR_PARAM))
.label('importance'))\
.where(t.c.linked_place_id == None) \
.where(t.c.geometry.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM)) \
.where(t.c.geometry.within_distance(NEAR_PARAM, NEAR_RADIUS_PARAM)) \
.order_by(t.c.centroid.ST_Distance(NEAR_PARAM)) \
.limit(LIMIT_PARAM)
@@ -403,8 +403,8 @@ class PoiSearch(AbstractSearch):
if details.near and details.near_radius is not None:
sql = sql.order_by(table.c.centroid.ST_Distance(NEAR_PARAM))\
.where(table.c.centroid.ST_DWithin(NEAR_PARAM,
NEAR_RADIUS_PARAM))
.where(table.c.centroid.within_distance(NEAR_PARAM,
NEAR_RADIUS_PARAM))
if self.countries:
sql = sql.where(t.c.country_code.in_(self.countries.values))
@@ -632,11 +632,11 @@ class PlaceSearch(AbstractSearch):
sql = sql.where(tsearch.c.address_rank > 9)
tpc = conn.t.postcode
pcs = self.postcodes.values
if self.expected_count > 1000:
if self.expected_count > 5000:
# Many results expected. Restrict by postcode.
sql = sql.where(sa.select(tpc.c.postcode)
.where(tpc.c.postcode.in_(pcs))
.where(tsearch.c.centroid.ST_DWithin(tpc.c.geometry, 0.12))
.where(tsearch.c.centroid.within_distance(tpc.c.geometry, 0.12))
.exists())
# Less results, only have a preference for close postcodes
@@ -648,27 +648,26 @@ 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))
sql = sql.where(tsearch.c.centroid
.intersects(VIEWBOX_PARAM,
use_index=details.viewbox.area < 0.2))
elif self.expected_count >= 10000:
if details.viewbox.area < 0.5:
sql = sql.where(tsearch.c.centroid.intersects(VIEWBOX2_PARAM))
else:
sql = sql.where(tsearch.c.centroid.ST_Intersects_no_index(VIEWBOX2_PARAM))
sql = sql.where(tsearch.c.centroid
.intersects(VIEWBOX2_PARAM,
use_index=details.viewbox.area < 0.5))
else:
penalty += sa.case((t.c.geometry.intersects(VIEWBOX_PARAM), 0.0),
(t.c.geometry.intersects(VIEWBOX2_PARAM), 0.5),
penalty += sa.case((t.c.geometry.intersects(VIEWBOX_PARAM, use_index=False), 0.0),
(t.c.geometry.intersects(VIEWBOX2_PARAM, use_index=False), 0.5),
else_=1.0)
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))
sql = sql.where(tsearch.c.centroid.within_distance(NEAR_PARAM,
NEAR_RADIUS_PARAM))
else:
sql = sql.where(tsearch.c.centroid.ST_DWithin_no_index(NEAR_PARAM,
NEAR_RADIUS_PARAM))
sql = sql.where(tsearch.c.centroid
.ST_Distance(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')))

34
nominatim/db/sqlalchemy_types/geometry.py
View File

@@ -165,7 +165,6 @@ def spatialite_dwithin_column(element: SaColumn,
compiler.process(dist, **kw))
class Geometry(types.UserDefinedType): # type: ignore[type-arg]
""" Simplified type decorator for PostGIS geometry. This type
only supports geometries in 4326 projection.
@@ -206,7 +205,10 @@ class Geometry(types.UserDefinedType): # type: ignore[type-arg]
class comparator_factory(types.UserDefinedType.Comparator): # type: ignore[type-arg]
def intersects(self, other: SaColumn) -> 'sa.Operators':
def intersects(self, other: SaColumn, use_index: bool = True) -> 'sa.Operators':
if not use_index:
return Geometry_IntersectsBbox(sa.func.coalesce(sa.null(), self.expr), other)
if isinstance(self.expr, sa.Column):
return Geometry_ColumnIntersectsBbox(self.expr, other)
@@ -221,20 +223,11 @@ class Geometry(types.UserDefinedType): # type: ignore[type-arg]
return Geometry_IsAreaLike(self)
def ST_DWithin(self, other: SaColumn, distance: SaColumn) -> SaColumn:
def within_distance(self, other: SaColumn, distance: SaColumn) -> SaColumn:
if isinstance(self.expr, sa.Column):
return Geometry_ColumnDWithin(self.expr, other, distance)
return sa.func.ST_DWithin(self.expr, other, distance)
def ST_DWithin_no_index(self, other: SaColumn, distance: SaColumn) -> SaColumn:
return sa.func.ST_DWithin(sa.func.coalesce(sa.null(), self),
other, distance)
def ST_Intersects_no_index(self, other: SaColumn) -> 'sa.Operators':
return Geometry_IntersectsBbox(sa.func.coalesce(sa.null(), self), other)
return self.ST_Distance(other) < distance
def ST_Distance(self, other: SaColumn) -> SaColumn:
@@ -313,18 +306,3 @@ def _add_function_alias(func: str, ftype: type, alias: str) -> None:
for alias in SQLITE_FUNCTION_ALIAS:
_add_function_alias(*alias)
class ST_DWithin(sa.sql.functions.GenericFunction[Any]):
name = 'ST_DWithin'
inherit_cache = True
@compiles(ST_DWithin, 'sqlite') # type: ignore[no-untyped-call, misc]
def default_json_array_each(element: SaColumn, compiler: 'sa.Compiled', **kw: Any) -> str:
geom1, geom2, dist = list(element.clauses)
return "(MbrIntersects(%s, ST_Expand(%s, %s)) = 1 AND ST_Distance(%s, %s) <= %s)" % (
compiler.process(geom1, **kw), compiler.process(geom2, **kw),
compiler.process(dist, **kw),
compiler.process(geom1, **kw), compiler.process(geom2, **kw),
compiler.process(dist, **kw))