replace CASE construct with plpgsql function

[nominatim.git] / nominatim / api / reverse.py

diff --git a/nominatim/api/reverse.py b/nominatim/api/reverse.py
index 053b96dd96f3a1c3db683f547eef76bde5ffc16c..62239a540afb62b4716a20fff957db680a802e64 100644 (file)
--- a/nominatim/api/reverse.py
+++ b/nominatim/api/reverse.py
@@ -7,26 +7,38 @@
 """
 Implementation of reverse geocoding.
 """
 """
 Implementation of reverse geocoding.
 """

-from typing import Optional
+from typing import Optional, List, Callable, Type, Tuple

 
 import sqlalchemy as sa
 
 import sqlalchemy as sa

-from geoalchemy2 import WKTElement
-from geoalchemy2.types import Geometry

 
 

-from nominatim.typing import SaColumn, SaSelect, SaTable, SaLabel, SaClause
+from nominatim.typing import SaColumn, SaSelect, SaFromClause, SaLabel, SaRow

 from nominatim.api.connection import SearchConnection
 import nominatim.api.results as nres
 from nominatim.api.logging import log
 from nominatim.api.connection import SearchConnection
 import nominatim.api.results as nres
 from nominatim.api.logging import log

-from nominatim.api.types import AnyPoint, DataLayer, LookupDetails, GeometryFormat
+from nominatim.api.types import AnyPoint, DataLayer, ReverseDetails, GeometryFormat, Bbox
+from nominatim.db.sqlalchemy_types import Geometry

 
 

-def _select_from_placex(t: SaTable, wkt: Optional[str] = None) -> SaSelect:
+# In SQLAlchemy expression which compare with NULL need to be expressed with
+# the equal sign.
+# pylint: disable=singleton-comparison
+
+RowFunc = Callable[[Optional[SaRow], Type[nres.ReverseResult]], Optional[nres.ReverseResult]]
+
+WKT_PARAM = sa.bindparam('wkt', type_=Geometry)
+MAX_RANK_PARAM = sa.bindparam('max_rank')
+
+def _select_from_placex(t: SaFromClause, use_wkt: bool = True) -> SaSelect:

     """ Create a select statement with the columns relevant for reverse
         results.
     """
     """ Create a select statement with the columns relevant for reverse
         results.
     """

-    if wkt is None:
+    if not use_wkt:

         distance = t.c.distance
         distance = t.c.distance

+        centroid = t.c.centroid

     else:
     else:

-        distance = t.c.geometry.ST_Distance(wkt)
+        distance = t.c.geometry.ST_Distance(WKT_PARAM)
+        centroid = sa.case((t.c.geometry.is_line_like(), t.c.geometry.ST_ClosestPoint(WKT_PARAM)),
+                           else_=t.c.centroid).label('centroid')
+

 
     return sa.select(t.c.place_id, t.c.osm_type, t.c.osm_id, t.c.name,
                      t.c.class_, t.c.type,
 
     return sa.select(t.c.place_id, t.c.osm_type, t.c.osm_id, t.c.name,
                      t.c.class_, t.c.type,


@@ -34,120 +46,171 @@ def _select_from_placex(t: SaTable, wkt: Optional[str] = None) -> SaSelect:
                      t.c.housenumber, t.c.postcode, t.c.country_code,
                      t.c.importance, t.c.wikipedia,
                      t.c.parent_place_id, t.c.rank_address, t.c.rank_search,
                      t.c.housenumber, t.c.postcode, t.c.country_code,
                      t.c.importance, t.c.wikipedia,
                      t.c.parent_place_id, t.c.rank_address, t.c.rank_search,

-                     t.c.centroid,
+                     centroid,

                      distance.label('distance'),
                      t.c.geometry.ST_Expand(0).label('bbox'))
 
 
                      distance.label('distance'),
                      t.c.geometry.ST_Expand(0).label('bbox'))
 
 

-def _interpolated_housenumber(table: SaTable) -> SaLabel:
-    # Entries with startnumber = endnumber are legacy from version < 4.1
+def _interpolated_housenumber(table: SaFromClause) -> SaLabel:

     return sa.cast(table.c.startnumber
                     + sa.func.round(((table.c.endnumber - table.c.startnumber) * table.c.position)
                                     / table.c.step) * table.c.step,
                    sa.Integer).label('housenumber')
 
 
     return sa.cast(table.c.startnumber
                     + sa.func.round(((table.c.endnumber - table.c.startnumber) * table.c.position)
                                     / table.c.step) * table.c.step,
                    sa.Integer).label('housenumber')
 
 

-def _is_address_point(table: SaTable) -> SaClause:
+def _interpolated_position(table: SaFromClause) -> SaLabel:
+    fac = sa.cast(table.c.step, sa.Float) / (table.c.endnumber - table.c.startnumber)
+    rounded_pos = sa.func.round(table.c.position / fac) * fac
+    return sa.case(
+             (table.c.endnumber == table.c.startnumber, table.c.linegeo.ST_Centroid()),
+              else_=table.c.linegeo.ST_LineInterpolatePoint(rounded_pos)).label('centroid')
+
+
+def _locate_interpolation(table: SaFromClause) -> SaLabel:
+    """ Given a position, locate the closest point on the line.
+    """
+    return sa.case((table.c.linegeo.is_line_like(),
+                    table.c.linegeo.ST_LineLocatePoint(WKT_PARAM)),
+                   else_=0).label('position')
+
+
+def _is_address_point(table: SaFromClause) -> SaColumn:

     return sa.and_(table.c.rank_address == 30,
                    sa.or_(table.c.housenumber != None,
                           table.c.name.has_key('housename')))
 
 
     return sa.and_(table.c.rank_address == 30,
                    sa.or_(table.c.housenumber != None,
                           table.c.name.has_key('housename')))
 
 

+def _get_closest(*rows: Optional[SaRow]) -> Optional[SaRow]:
+    return min(rows, key=lambda row: 1000 if row is None else row.distance)
+
+

 class ReverseGeocoder:
     """ Class implementing the logic for looking up a place from a
         coordinate.
     """
 
 class ReverseGeocoder:
     """ Class implementing the logic for looking up a place from a
         coordinate.
     """
 

-    def __init__(self, conn: SearchConnection, max_rank: int, layer: DataLayer,
-                 details: LookupDetails) -> None:
+    def __init__(self, conn: SearchConnection, params: ReverseDetails) -> None:

         self.conn = conn
         self.conn = conn

-        self.max_rank = max_rank
-        self.layer = layer
-        self.details = details
+        self.params = params
+
+        self.bind_params = {'max_rank': params.max_rank}
+
+
+    @property
+    def max_rank(self) -> int:
+        """ Return the maximum configured rank.
+        """
+        return self.params.max_rank
+
+
+    def has_geometries(self) -> bool:
+        """ Check if any geometries are requested.
+        """
+        return bool(self.params.geometry_output)
+
+
+    def layer_enabled(self, *layer: DataLayer) -> bool:
+        """ Return true when any of the given layer types are requested.
+        """
+        return any(self.params.layers & l for l in layer)
+
+
+    def layer_disabled(self, *layer: DataLayer) -> bool:
+        """ Return true when none of the given layer types is requested.
+        """
+        return not any(self.params.layers & l for l in layer)
+
+
+    def has_feature_layers(self) -> bool:
+        """ Return true if any layer other than ADDRESS or POI is requested.
+        """
+        return self.layer_enabled(DataLayer.RAILWAY, DataLayer.MANMADE, DataLayer.NATURAL)

 
 
     def _add_geometry_columns(self, sql: SaSelect, col: SaColumn) -> SaSelect:
 
 
     def _add_geometry_columns(self, sql: SaSelect, col: SaColumn) -> SaSelect:

-        if not self.details.geometry_output:
+        if not self.has_geometries():

             return sql
 
         out = []
 
             return sql
 
         out = []
 

-        if self.details.geometry_simplification > 0.0:
-            col = col.ST_SimplifyPreserveTopology(self.details.geometry_simplification)
+        if self.params.geometry_simplification > 0.0:
+            col = sa.func.ST_SimplifyPreserveTopology(col, self.params.geometry_simplification)

 
 

-        if self.details.geometry_output & GeometryFormat.GEOJSON:
-            out.append(col.ST_AsGeoJSON().label('geometry_geojson'))
-        if self.details.geometry_output & GeometryFormat.TEXT:
-            out.append(col.ST_AsText().label('geometry_text'))
-        if self.details.geometry_output & GeometryFormat.KML:
-            out.append(col.ST_AsKML().label('geometry_kml'))
-        if self.details.geometry_output & GeometryFormat.SVG:
-            out.append(col.ST_AsSVG().label('geometry_svg'))
+        if self.params.geometry_output & GeometryFormat.GEOJSON:
+            out.append(sa.func.ST_AsGeoJSON(col).label('geometry_geojson'))
+        if self.params.geometry_output & GeometryFormat.TEXT:
+            out.append(sa.func.ST_AsText(col).label('geometry_text'))
+        if self.params.geometry_output & GeometryFormat.KML:
+            out.append(sa.func.ST_AsKML(col).label('geometry_kml'))
+        if self.params.geometry_output & GeometryFormat.SVG:
+            out.append(sa.func.ST_AsSVG(col).label('geometry_svg'))

 
         return sql.add_columns(*out)
 
 
 
         return sql.add_columns(*out)
 
 

-    def _filter_by_layer(self, table: SaTable) -> SaColumn:
-        if self.layer & DataLayer.MANMADE:
+    def _filter_by_layer(self, table: SaFromClause) -> SaColumn:
+        if self.layer_enabled(DataLayer.MANMADE):

             exclude = []
             exclude = []

-            if not (self.layer & DataLayer.RAILWAY):
+            if self.layer_disabled(DataLayer.RAILWAY):

                 exclude.append('railway')
                 exclude.append('railway')

-            if not (self.layer & DataLayer.NATURAL):
+            if self.layer_disabled(DataLayer.NATURAL):

                 exclude.extend(('natural', 'water', 'waterway'))
             return table.c.class_.not_in(tuple(exclude))
 
         include = []
                 exclude.extend(('natural', 'water', 'waterway'))
             return table.c.class_.not_in(tuple(exclude))
 
         include = []

-        if self.layer & DataLayer.RAILWAY:
+        if self.layer_enabled(DataLayer.RAILWAY):

             include.append('railway')
             include.append('railway')

-        if not (self.layer & DataLayer.NATURAL):
+        if self.layer_enabled(DataLayer.NATURAL):

             include.extend(('natural', 'water', 'waterway'))
         return table.c.class_.in_(tuple(include))
 
 
             include.extend(('natural', 'water', 'waterway'))
         return table.c.class_.in_(tuple(include))
 
 

-    async def _find_closest_street_or_poi(self, wkt: WKTElement) -> SaRow:
-        """ Look up the clostest rank 26+ place in the database.
+    async def _find_closest_street_or_poi(self, distance: float) -> Optional[SaRow]:
+        """ Look up the closest rank 26+ place in the database, which
+            is closer than the given distance.

         """
         t = self.conn.t.placex
 
         """
         t = self.conn.t.placex
 

-        sql = _select_from_placex(t, wkt)\
-                .where(t.c.geometry.ST_DWithin(wkt, distance))\
+        sql = _select_from_placex(t)\
+                .where(t.c.geometry.ST_DWithin(WKT_PARAM, distance))\

                 .where(t.c.indexed_status == 0)\
                 .where(t.c.linked_place_id == None)\
                 .where(t.c.indexed_status == 0)\
                 .where(t.c.linked_place_id == None)\

-                .where(sa.or_(t.c.geometry.ST_GeometryType().not_in(('ST_Polygon', 'ST_MultiPolygon')),
-                              t.c.centroid.ST_Distance(wkt) < distance))\
+                .where(sa.or_(sa.not_(t.c.geometry.is_area()),
+                              t.c.centroid.ST_Distance(WKT_PARAM) < distance))\

                 .order_by('distance')\
                 .limit(1)
 
         sql = self._add_geometry_columns(sql, t.c.geometry)
 
                 .order_by('distance')\
                 .limit(1)
 
         sql = self._add_geometry_columns(sql, t.c.geometry)
 

-        restrict = []
+        restrict: List[SaColumn] = []

 
 

-        if self.layer & DataLayer.ADDRESS:
+        if self.layer_enabled(DataLayer.ADDRESS):

             restrict.append(sa.and_(t.c.rank_address >= 26,
             restrict.append(sa.and_(t.c.rank_address >= 26,

-                                    t.c.rank_address <= self.max_rank))
+                                    t.c.rank_address <= min(29, self.max_rank)))

             if self.max_rank == 30:
                 restrict.append(_is_address_point(t))
             if self.max_rank == 30:
                 restrict.append(_is_address_point(t))

-        if self.layer & DataLayer.POI and max_rank == 30:
+        if self.layer_enabled(DataLayer.POI) and self.max_rank == 30:

             restrict.append(sa.and_(t.c.rank_search == 30,
                                     t.c.class_.not_in(('place', 'building')),
             restrict.append(sa.and_(t.c.rank_search == 30,
                                     t.c.class_.not_in(('place', 'building')),

-                                    t.c.geometry.ST_GeometryType() != 'ST_LineString'))
-        if self.layer & (DataLayer.RAILWAY | DataLayer.MANMADE | DataLayer.NATURAL):
-            restrict.append(sa.and_(t.c.rank_search >= 26,
-                                    tc.rank_search <= self.max_rank,
+                                    sa.not_(t.c.geometry.is_line_like())))
+        if self.has_feature_layers():
+            restrict.append(sa.and_(t.c.rank_search.between(26, MAX_RANK_PARAM),
+                                    t.c.rank_address == 0,

                                     self._filter_by_layer(t)))
 
                                     self._filter_by_layer(t)))
 

-        if restrict:
-            sql = sql.where(sa.or_(*restrict))
+        if not restrict:
+            return None
+
+        sql = sql.where(sa.or_(*restrict))

 
 

-        return (await self.conn.execute(sql)).one_or_none()
+        return (await self.conn.execute(sql, self.bind_params)).one_or_none()

 
 
 
 

-    async def _find_housenumber_for_street(self, parent_place_id: int,
-                                           wkt: WKTElement) -> Optional[SaRow]:
-        t = conn.t.placex
+    async def _find_housenumber_for_street(self, parent_place_id: int) -> Optional[SaRow]:
+        t = self.conn.t.placex

 
 

-        sql = _select_from_placex(t, wkt)\
-                .where(t.c.geometry.ST_DWithin(wkt, 0.001))\
+        sql = _select_from_placex(t)\
+                .where(t.c.geometry.ST_DWithin(WKT_PARAM, 0.001))\

                 .where(t.c.parent_place_id == parent_place_id)\
                 .where(_is_address_point(t))\
                 .where(t.c.indexed_status == 0)\
                 .where(t.c.parent_place_id == parent_place_id)\
                 .where(_is_address_point(t))\
                 .where(t.c.indexed_status == 0)\


@@ -157,115 +220,125 @@ class ReverseGeocoder:
 
         sql = self._add_geometry_columns(sql, t.c.geometry)
 
 
         sql = self._add_geometry_columns(sql, t.c.geometry)
 

-        return (await self.conn.execute(sql)).one_or_none()
+        return (await self.conn.execute(sql, self.bind_params)).one_or_none()

 
 
     async def _find_interpolation_for_street(self, parent_place_id: Optional[int],
 
 
     async def _find_interpolation_for_street(self, parent_place_id: Optional[int],

-                                             wkt: WKTElement) -> Optional[SaRow]:
+                                             distance: float) -> Optional[SaRow]:

         t = self.conn.t.osmline
 
         t = self.conn.t.osmline
 

-        inner = sa.select(t,
-                          t.c.linegeo.ST_Distance(wkt).label('distance'),
-                          t.c.linegeo.ST_LineLocatePoint(wkt).label('position'))\
-                  .where(t.c.linegeo.ST_DWithin(wkt, distance))\
-                  .order_by('distance')\
-                  .limit(1)
+        sql = 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.startnumber != None)\
+                .order_by('distance')\
+                .limit(1)

 
         if parent_place_id is not None:
 
         if parent_place_id is not None:

-            inner = inner.where(t.c.parent_place_id == parent_place_id)
+            sql = sql.where(t.c.parent_place_id == parent_place_id)

 
 

-        inner = inner.subquery()
+        inner = sql.subquery('ipol')

 
         sql = sa.select(inner.c.place_id, inner.c.osm_id,
                         inner.c.parent_place_id, inner.c.address,
                         _interpolated_housenumber(inner),
 
         sql = sa.select(inner.c.place_id, inner.c.osm_id,
                         inner.c.parent_place_id, inner.c.address,
                         _interpolated_housenumber(inner),

+                        _interpolated_position(inner),

                         inner.c.postcode, inner.c.country_code,
                         inner.c.postcode, inner.c.country_code,

-                        inner.c.linegeo.ST_LineInterpolatePoint(inner.c.position).label('centroid'),

                         inner.c.distance)
 
                         inner.c.distance)
 

-        if self.details.geometry_output:
-            sub = sql.subquery()
-            sql = self._add_geometry_columns(sql, sub.c.centroid)
+        if self.has_geometries():
+            sub = sql.subquery('geom')
+            sql = self._add_geometry_columns(sa.select(sub), sub.c.centroid)

 
 

-        return (await self.conn.execute(sql)).one_or_none()
+        return (await self.conn.execute(sql, self.bind_params)).one_or_none()

 
 
     async def _find_tiger_number_for_street(self, parent_place_id: int,
 
 
     async def _find_tiger_number_for_street(self, parent_place_id: int,

-                                            wkt: WKTElement) -> Optional[SaRow]:
+                                            parent_type: str,
+                                            parent_id: int) -> Optional[SaRow]:

         t = self.conn.t.tiger
 
         inner = sa.select(t,
         t = self.conn.t.tiger
 
         inner = sa.select(t,

-                          t.c.linegeo.ST_Distance(wkt).label('distance'),
-                          sa.func.ST_LineLocatePoint(t.c.linegeo, wkt).label('position'))\
-                  .where(t.c.linegeo.ST_DWithin(wkt, 0.001))\
+                          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.parent_place_id == parent_place_id)\
                   .order_by('distance')\
                   .limit(1)\
                   .where(t.c.parent_place_id == parent_place_id)\
                   .order_by('distance')\
                   .limit(1)\

-                  .subquery()
+                  .subquery('tiger')

 
         sql = sa.select(inner.c.place_id,
                         inner.c.parent_place_id,
 
         sql = sa.select(inner.c.place_id,
                         inner.c.parent_place_id,

+                        sa.literal(parent_type).label('osm_type'),
+                        sa.literal(parent_id).label('osm_id'),

                         _interpolated_housenumber(inner),
                         _interpolated_housenumber(inner),

+                        _interpolated_position(inner),

                         inner.c.postcode,
                         inner.c.postcode,

-                        inner.c.linegeo.ST_LineInterpolatePoint(inner.c.position).label('centroid'),

                         inner.c.distance)
 
                         inner.c.distance)
 

-        if self.details.geometry_output:
-            sub = sql.subquery()
-            sql = self._add_geometry_columns(sql, sub.c.centroid)
+        if self.has_geometries():
+            sub = sql.subquery('geom')
+            sql = self._add_geometry_columns(sa.select(sub), sub.c.centroid)

 
 

-        return (await conn.execute(sql)).one_or_none()
+        return (await self.conn.execute(sql, self.bind_params)).one_or_none()

 
 
 
 

-    async def lookup_street_poi(self, wkt: WKTElement) -> Optional[nres.ReverseResult]:
+    async def lookup_street_poi(self) -> Tuple[Optional[SaRow], RowFunc]:

         """ Find a street or POI/address for the given WKT point.
         """
         log().section('Reverse lookup on street/address level')
         """ Find a street or POI/address for the given WKT point.
         """
         log().section('Reverse lookup on street/address level')

-        result = None

         distance = 0.006
         parent_place_id = None
 
         distance = 0.006
         parent_place_id = None
 

-        row = await self._find_closest_street_or_poi(wkt)
+        row = await self._find_closest_street_or_poi(distance)
+        row_func: RowFunc = nres.create_from_placex_row

         log().var_dump('Result (street/building)', row)
 
         # If the closest result was a street, but an address was requested,
         # check for a housenumber nearby which is part of the street.
         if row is not None:
             if self.max_rank > 27 \
         log().var_dump('Result (street/building)', row)
 
         # If the closest result was a street, but an address was requested,
         # check for a housenumber nearby which is part of the street.
         if row is not None:
             if self.max_rank > 27 \

-               and self.layer & DataLayer.ADDRESS \
+               and self.layer_enabled(DataLayer.ADDRESS) \

                and row.rank_address <= 27:
                 distance = 0.001
                 parent_place_id = row.place_id
                 log().comment('Find housenumber for street')
                and row.rank_address <= 27:
                 distance = 0.001
                 parent_place_id = row.place_id
                 log().comment('Find housenumber for street')

-                addr_row = await self._find_housenumber_for_street(parent_place_id, wkt)
+                addr_row = await self._find_housenumber_for_street(parent_place_id)

                 log().var_dump('Result (street housenumber)', addr_row)
 
                 if addr_row is not None:
                     row = addr_row
                 log().var_dump('Result (street housenumber)', addr_row)
 
                 if addr_row is not None:
                     row = addr_row

+                    row_func = nres.create_from_placex_row

                     distance = addr_row.distance
                 elif row.country_code == 'us' and parent_place_id is not None:
                     log().comment('Find TIGER housenumber for street')
                     distance = addr_row.distance
                 elif row.country_code == 'us' and parent_place_id is not None:
                     log().comment('Find TIGER housenumber for street')

-                    addr_row = await self._find_tiger_number_for_street(parent_place_id, wkt)
+                    addr_row = await self._find_tiger_number_for_street(parent_place_id,
+                                                                        row.osm_type,
+                                                                        row.osm_id)

                     log().var_dump('Result (street Tiger housenumber)', addr_row)
 
                     if addr_row is not None:
                     log().var_dump('Result (street Tiger housenumber)', addr_row)
 
                     if addr_row is not None:

-                        result = nres.create_from_tiger_row(addr_row)
+                        row = addr_row
+                        row_func = nres.create_from_tiger_row

             else:
                 distance = row.distance
 
         # Check for an interpolation that is either closer than our result
         # or belongs to a close street found.
             else:
                 distance = row.distance
 
         # Check for an interpolation that is either closer than our result
         # or belongs to a close street found.

-        if self.max_rank > 27 and self.layer & DataLayer.ADDRESS:
+        if self.max_rank > 27 and self.layer_enabled(DataLayer.ADDRESS):

             log().comment('Find interpolation for street')
             log().comment('Find interpolation for street')

-            addr_row = await self._find_interpolation_for_street(parent_place_id, wkt)
+            addr_row = await self._find_interpolation_for_street(parent_place_id,
+                                                                 distance)

             log().var_dump('Result (street interpolation)', addr_row)
             if addr_row is not None:
             log().var_dump('Result (street interpolation)', addr_row)
             if addr_row is not None:

-                result = nres.create_from_osmline_row(addr_row)
+                row = addr_row
+                row_func = nres.create_from_osmline_row

 
 

-        return result or nres.create_from_placex_row(row)
+        return row, row_func

 
 
 
 

-    async def _lookup_area_address(self, wkt: WKTElement) -> Optional[SaRow]:
+    async def _lookup_area_address(self) -> Optional[SaRow]:

         """ Lookup large addressable areas for the given WKT point.
         """
         log().comment('Reverse lookup by larger address area features')
         """ Lookup large addressable areas for the given WKT point.
         """
         log().comment('Reverse lookup by larger address area features')


@@ -274,35 +347,35 @@ class ReverseGeocoder:
         # The inner SQL brings results in the right order, so that
         # later only a minimum of results needs to be checked with ST_Contains.
         inner = sa.select(t, sa.literal(0.0).label('distance'))\
         # The inner SQL brings results in the right order, so that
         # later only a minimum of results needs to be checked with ST_Contains.
         inner = sa.select(t, sa.literal(0.0).label('distance'))\

-                  .where(t.c.rank_search.between(5, self.max_rank))\
+                  .where(t.c.rank_search.between(5, MAX_RANK_PARAM))\

                   .where(t.c.rank_address.between(5, 25))\
                   .where(t.c.rank_address.between(5, 25))\

-                  .where(t.c.geometry.ST_GeometryType().in_(('ST_Polygon', 'ST_MultiPolygon')))\
-                  .where(t.c.geometry.intersects(wkt))\
+                  .where(t.c.geometry.is_area())\
+                  .where(t.c.geometry.intersects(WKT_PARAM))\

                   .where(t.c.name != None)\
                   .where(t.c.indexed_status == 0)\
                   .where(t.c.linked_place_id == None)\
                   .where(t.c.type != 'postcode')\
                   .order_by(sa.desc(t.c.rank_search))\
                   .limit(50)\
                   .where(t.c.name != None)\
                   .where(t.c.indexed_status == 0)\
                   .where(t.c.linked_place_id == None)\
                   .where(t.c.type != 'postcode')\
                   .order_by(sa.desc(t.c.rank_search))\
                   .limit(50)\

-                  .subquery()
+                  .subquery('area')

 
 

-        sql = _select_from_placex(inner)\
-                  .where(inner.c.geometry.ST_Contains(wkt))\
+        sql = _select_from_placex(inner, False)\
+                  .where(inner.c.geometry.ST_Contains(WKT_PARAM))\

                   .order_by(sa.desc(inner.c.rank_search))\
                   .limit(1)
 
         sql = self._add_geometry_columns(sql, inner.c.geometry)
 
                   .order_by(sa.desc(inner.c.rank_search))\
                   .limit(1)
 
         sql = self._add_geometry_columns(sql, inner.c.geometry)
 

-        address_row = (await self.conn.execute(sql)).one_or_none()
+        address_row = (await self.conn.execute(sql, self.bind_params)).one_or_none()

         log().var_dump('Result (area)', address_row)
 
         log().var_dump('Result (area)', address_row)
 

-        if address_row is not None and address_row.rank_search < max_rank:
+        if address_row is not None and address_row.rank_search < self.max_rank:

             log().comment('Search for better matching place nodes inside the area')
             inner = sa.select(t,
             log().comment('Search for better matching place nodes inside the area')
             inner = sa.select(t,

-                              t.c.geometry.ST_Distance(wkt).label('distance'))\
+                              t.c.geometry.ST_Distance(WKT_PARAM).label('distance'))\

                       .where(t.c.osm_type == 'N')\
                       .where(t.c.rank_search > address_row.rank_search)\
                       .where(t.c.osm_type == 'N')\
                       .where(t.c.rank_search > address_row.rank_search)\

-                      .where(t.c.rank_search <= max_rank)\
+                      .where(t.c.rank_search <= MAX_RANK_PARAM)\

                       .where(t.c.rank_address.between(5, 25))\
                       .where(t.c.name != None)\
                       .where(t.c.indexed_status == 0)\
                       .where(t.c.rank_address.between(5, 25))\
                       .where(t.c.name != None)\
                       .where(t.c.indexed_status == 0)\


@@ -310,22 +383,22 @@ class ReverseGeocoder:
                       .where(t.c.type != 'postcode')\
                       .where(t.c.geometry
                                 .ST_Buffer(sa.func.reverse_place_diameter(t.c.rank_search))
                       .where(t.c.type != 'postcode')\
                       .where(t.c.geometry
                                 .ST_Buffer(sa.func.reverse_place_diameter(t.c.rank_search))

-                                .intersects(wkt))\
+                                .intersects(WKT_PARAM))\

                       .order_by(sa.desc(t.c.rank_search))\
                       .limit(50)\
                       .order_by(sa.desc(t.c.rank_search))\
                       .limit(50)\

-                      .subquery()
+                      .subquery('places')

 
 

-            touter = conn.t.placex.alias('outer')
-            sql = _select_from_placex(inner)\
+            touter = self.conn.t.placex.alias('outer')
+            sql = _select_from_placex(inner, False)\
+                  .join(touter, touter.c.geometry.ST_Contains(inner.c.geometry))\

                   .where(touter.c.place_id == address_row.place_id)\
                   .where(touter.c.place_id == address_row.place_id)\

-                  .where(touter.c.geometry.ST_Contains(inner.c.geometry))\

                   .where(inner.c.distance < sa.func.reverse_place_diameter(inner.c.rank_search))\
                   .order_by(sa.desc(inner.c.rank_search), inner.c.distance)\
                   .limit(1)
 
             sql = self._add_geometry_columns(sql, inner.c.geometry)
 
                   .where(inner.c.distance < sa.func.reverse_place_diameter(inner.c.rank_search))\
                   .order_by(sa.desc(inner.c.rank_search), inner.c.distance)\
                   .limit(1)
 
             sql = self._add_geometry_columns(sql, inner.c.geometry)
 

-            place_address_row = (await self.conn.execute(sql)).one_or_none()
+            place_address_row = (await self.conn.execute(sql, self.bind_params)).one_or_none()

             log().var_dump('Result (place node)', place_address_row)
 
             if place_address_row is not None:
             log().var_dump('Result (place node)', place_address_row)
 
             if place_address_row is not None:


@@ -334,83 +407,78 @@ class ReverseGeocoder:
         return address_row
 
 
         return address_row
 
 

-    async def _lookup_area_others(self, wkt: WKTElement) -> Optional[SaRow]:
-        t = conn.t.placex
+    async def _lookup_area_others(self) -> Optional[SaRow]:
+        t = self.conn.t.placex

 
 

-        inner = sa.select(t, t.c.geometry.ST_Distance(wkt).label('distance'))\
+        inner = sa.select(t, t.c.geometry.ST_Distance(WKT_PARAM).label('distance'))\

                   .where(t.c.rank_address == 0)\
                   .where(t.c.rank_address == 0)\

-                  .where(t.c.rank_search.between(5, self.max_rank))\
+                  .where(t.c.rank_search.between(5, MAX_RANK_PARAM))\

                   .where(t.c.name != None)\
                   .where(t.c.indexed_status == 0)\
                   .where(t.c.linked_place_id == None)\
                   .where(self._filter_by_layer(t))\
                   .where(t.c.name != None)\
                   .where(t.c.indexed_status == 0)\
                   .where(t.c.linked_place_id == None)\
                   .where(self._filter_by_layer(t))\

-                  .where(sa.func.reverse_buffered_extent(t.c.geometry, type_=Geometry)
-                                .intersects(wkt))\
+                  .where(t.c.geometry
+                                .ST_Buffer(sa.func.reverse_place_diameter(t.c.rank_search))
+                                .intersects(WKT_PARAM))\

                   .order_by(sa.desc(t.c.rank_search))\
                   .order_by(sa.desc(t.c.rank_search))\

-                  .limit(50)
+                  .limit(50)\
+                  .subquery()

 
 

-        sql = _select_from_placex(inner)\
-                  .where(sa._or(inner.c.geometry.ST_GeometryType().not_in(('ST_Polygon', 'ST_MultiPolygon')),
-                                inner.c.geometry.ST_Contains(wkt)))\
+        sql = _select_from_placex(inner, False)\
+                  .where(sa.or_(sa.not_(inner.c.geometry.is_area()),
+                                inner.c.geometry.ST_Contains(WKT_PARAM)))\

                   .order_by(sa.desc(inner.c.rank_search), inner.c.distance)\
                   .limit(1)
 
         sql = self._add_geometry_columns(sql, inner.c.geometry)
 
                   .order_by(sa.desc(inner.c.rank_search), inner.c.distance)\
                   .limit(1)
 
         sql = self._add_geometry_columns(sql, inner.c.geometry)
 

-        row = (await self.conn.execute(sql)).one_or_none()
+        row = (await self.conn.execute(sql, self.bind_params)).one_or_none()

         log().var_dump('Result (non-address feature)', row)
 
         return row
 
 
         log().var_dump('Result (non-address feature)', row)
 
         return row
 
 

-    async def lookup_area(self, wkt: WKTElement) -> Optional[nres.ReverseResult]:
-        """ Lookup large areas for the given WKT point.
+    async def lookup_area(self) -> Optional[SaRow]:
+        """ Lookup large areas for the current search.

         """
         log().section('Reverse lookup by larger area features')
         """
         log().section('Reverse lookup by larger area features')

-        t = self.conn.t.placex

 
 

-        if self.layer & DataLayer.ADDRESS:
-            address_row = await self._lookup_area_address(wkt)
-            address_distance = address_row.distance
+        if self.layer_enabled(DataLayer.ADDRESS):
+            address_row = await self._lookup_area_address()

         else:
             address_row = None
         else:
             address_row = None

-            address_distance = 1000

 
 

-        if self.layer & (~DataLayer.ADDRESS & ~DataLayer.POI):
-            other_row = await self._lookup_area_others(wkt)
-            other_distance = other_row.distance
+        if self.has_feature_layers():
+            other_row = await self._lookup_area_others()

         else:
             other_row = None
         else:
             other_row = None

-            other_distance = 1000
-
-        result = address_row if address_distance <= other_distance else other_row

 
 

-        return nres.create_from_placex_row(result)
+        return _get_closest(address_row, other_row)

 
 
 
 

-    async def lookup_country(self, wkt: WKTElement) -> Optional[nres.ReverseResult]:
-        """ Lookup the country for the given WKT point.
+    async def lookup_country(self) -> Optional[SaRow]:
+        """ Lookup the country for the current search.

         """
         log().section('Reverse lookup by country code')
         t = self.conn.t.country_grid
         sql = sa.select(t.c.country_code).distinct()\
         """
         log().section('Reverse lookup by country code')
         t = self.conn.t.country_grid
         sql = sa.select(t.c.country_code).distinct()\

-                .where(t.c.geometry.ST_Contains(wkt))
+                .where(t.c.geometry.ST_Contains(WKT_PARAM))

 
 

-        ccodes = tuple((r[0] for r in await self.conn.execute(sql)))
+        ccodes = tuple((r[0] for r in await self.conn.execute(sql, self.bind_params)))

         log().var_dump('Country codes', ccodes)
 
         if not ccodes:
             return None
 
         log().var_dump('Country codes', ccodes)
 
         if not ccodes:
             return None
 

-        if self.layer & DataLayer.ADDRESS and self.max_rank > 4:
+        t = self.conn.t.placex
+        if self.max_rank > 4:

             log().comment('Search for place nodes in country')
 
             log().comment('Search for place nodes in country')
 

-            t = conn.t.placex

             inner = sa.select(t,
             inner = sa.select(t,

-                              t.c.geometry.ST_Distance(wkt).label('distance'))\
+                              t.c.geometry.ST_Distance(WKT_PARAM).label('distance'))\

                       .where(t.c.osm_type == 'N')\
                       .where(t.c.rank_search > 4)\
                       .where(t.c.osm_type == 'N')\
                       .where(t.c.rank_search > 4)\

-                      .where(t.c.rank_search <= self.max_rank)\
+                      .where(t.c.rank_search <= MAX_RANK_PARAM)\

                       .where(t.c.rank_address.between(5, 25))\
                       .where(t.c.name != None)\
                       .where(t.c.indexed_status == 0)\
                       .where(t.c.rank_address.between(5, 25))\
                       .where(t.c.name != None)\
                       .where(t.c.indexed_status == 0)\


@@ -419,91 +487,67 @@ class ReverseGeocoder:
                       .where(t.c.country_code.in_(ccodes))\
                       .where(t.c.geometry
                                 .ST_Buffer(sa.func.reverse_place_diameter(t.c.rank_search))
                       .where(t.c.country_code.in_(ccodes))\
                       .where(t.c.geometry
                                 .ST_Buffer(sa.func.reverse_place_diameter(t.c.rank_search))

-                                .intersects(wkt))\
+                                .intersects(WKT_PARAM))\

                       .order_by(sa.desc(t.c.rank_search))\
                       .limit(50)\
                       .subquery()
 
                       .order_by(sa.desc(t.c.rank_search))\
                       .limit(50)\
                       .subquery()
 

-            sql = _select_from_placex(inner)\
+            sql = _select_from_placex(inner, False)\

                   .where(inner.c.distance < sa.func.reverse_place_diameter(inner.c.rank_search))\
                   .order_by(sa.desc(inner.c.rank_search), inner.c.distance)\
                   .limit(1)
 
             sql = self._add_geometry_columns(sql, inner.c.geometry)
 
                   .where(inner.c.distance < sa.func.reverse_place_diameter(inner.c.rank_search))\
                   .order_by(sa.desc(inner.c.rank_search), inner.c.distance)\
                   .limit(1)
 
             sql = self._add_geometry_columns(sql, inner.c.geometry)
 

-            address_row = (await self.conn.execute(sql)).one_or_none()
+            address_row = (await self.conn.execute(sql, self.bind_params)).one_or_none()

             log().var_dump('Result (addressable place node)', address_row)
         else:
             address_row = None
 
             log().var_dump('Result (addressable place node)', address_row)
         else:
             address_row = None
 

-        if layer & (~DataLayer.ADDRESS & ~DataLayer.POI) and self.max_rank > 4:
-            log().comment('Search for non-address features inside country')
-
-            t = conn.t.placex
-            inner = sa.select(t, t.c.geometry.ST_Distance(wkt).label('distance'))\
-                      .where(t.c.rank_address == 0)\
-                      .where(t.c.rank_search.between(5, self.max_rank))\
-                      .where(t.c.name != None)\
-                      .where(t.c.indexed_status == 0)\
-                      .where(t.c.linked_place_id == None)\
-                      .where(self._filter_by_layer(t))\
-                      .where(t.c.country_code.in_(ccode))\
-                      .where(sa.func.reverse_buffered_extent(t.c.geometry, type_=Geometry)
-                                    .intersects(wkt))\
-                      .order_by(sa.desc(t.c.rank_search))\
-                      .limit(50)\
-                      .subquery()
-
-            sql = _select_from_placex(inner)\
-                      .where(sa._or(inner.c.geometry.ST_GeometryType().not_in(('ST_Polygon', 'ST_MultiPolygon')),
-                                    inner.c.geometry.ST_Contains(wkt)))\
-                      .order_by(sa.desc(inner.c.rank_search), inner.c.distance)\
-                      .limit(1)
-
-            sql = self._add_geometry_columns(sql, inner.c.geometry)
-
-            other_row = (await self.conn.execute(sql)).one_or_none()
-            log().var_dump('Result (non-address feature)', other_row)
-        else:
-            other_row = None
-
-        if layer & DataLayer.ADDRESS and address_row is None and other_row is None:
+        if address_row is None:

             # Still nothing, then return a country with the appropriate country code.
             # Still nothing, then return a country with the appropriate country code.

-            t = conn.t.placex
-            sql = _select_from_placex(t, wkt)\
+            sql = _select_from_placex(t)\

                       .where(t.c.country_code.in_(ccodes))\
                       .where(t.c.rank_address == 4)\
                       .where(t.c.rank_search == 4)\
                       .where(t.c.linked_place_id == None)\
                       .where(t.c.country_code.in_(ccodes))\
                       .where(t.c.rank_address == 4)\
                       .where(t.c.rank_search == 4)\
                       .where(t.c.linked_place_id == None)\

-                      .order_by('distance')
+                      .order_by('distance')\
+                      .limit(1)

 
 

-            sql = self._add_geometry_columns(sql, inner.c.geometry)
+            sql = self._add_geometry_columns(sql, t.c.geometry)

 
 

-            address_row = (await self.conn.execute(sql)).one_or_none()
+            address_row = (await self.conn.execute(sql, self.bind_params)).one_or_none()

 
 

-        return nres.create_from_placex_row(_get_closest_row(address_row, other_row))
+        return address_row

 
 
     async def lookup(self, coord: AnyPoint) -> Optional[nres.ReverseResult]:
         """ Look up a single coordinate. Returns the place information,
             if a place was found near the coordinates or None otherwise.
         """
 
 
     async def lookup(self, coord: AnyPoint) -> Optional[nres.ReverseResult]:
         """ Look up a single coordinate. Returns the place information,
             if a place was found near the coordinates or None otherwise.
         """

-        log().function('reverse_lookup',
-                       coord=coord, max_rank=self.max_rank,
-                       layer=self.layer, details=self.details)
+        log().function('reverse_lookup', coord=coord, params=self.params)
+

 
 

+        self.bind_params['wkt'] = f'POINT({coord[0]} {coord[1]})'

 
 

-        wkt = WKTElement(f'POINT({coord[0]} {coord[1]})', srid=4326)
+        row: Optional[SaRow] = None
+        row_func: RowFunc = nres.create_from_placex_row

 
 

-        result: Optional[ReverseResult] = None
+        if self.max_rank >= 26:
+            row, tmp_row_func = await self.lookup_street_poi()
+            if row is not None:
+                row_func = tmp_row_func
+        if row is None and self.max_rank > 4:
+            row = await self.lookup_area()
+        if row is None and self.layer_enabled(DataLayer.ADDRESS):
+            row = await self.lookup_country()

 
 

-        if max_rank >= 26:
-            result = await self.lookup_street_poi(wkt)
-        if result is None and max_rank > 4:
-            result = await self.lookup_area(wkt)
-        if result is None:
-            result = await self.lookup_country(wkt)
+        result = row_func(row, nres.ReverseResult)

         if result is not None:
         if result is not None:

-            await nres.add_result_details(self.conn, result, self.details)
+            assert row is not None
+            result.distance = row.distance
+            if hasattr(row, 'bbox'):
+                result.bbox = Bbox.from_wkb(row.bbox)
+            await nres.add_result_details(self.conn, [result], self.params)

 
         return result
 
         return result