nominatim/api/search/db_searches.py

   1 # SPDX-License-Identifier: GPL-3.0-or-later
   2 #
   3 # This file is part of Nominatim. (https://nominatim.org)
   4 #
   5 # Copyright (C) 2023 by the Nominatim developer community.
   6 # For a full list of authors see the git log.
   7 """
   8 Implementation of the acutal database accesses for forward search.
   9 """
  10 from typing import List, Tuple, AsyncIterator, Dict, Any, Callable
  11 import abc
  12
  13 import sqlalchemy as sa
  14 from sqlalchemy.dialects.postgresql import ARRAY, array_agg
  15
  16 from nominatim.typing import SaFromClause, SaScalarSelect, SaColumn, \
  17                              SaExpression, SaSelect, SaLambdaSelect, SaRow, SaBind
  18 from nominatim.api.connection import SearchConnection
  19 from nominatim.api.types import SearchDetails, DataLayer, GeometryFormat, Bbox
  20 import nominatim.api.results as nres
  21 from nominatim.api.search.db_search_fields import SearchData, WeightedCategories
  22 from nominatim.db.sqlalchemy_types import Geometry
  23
  24 #pylint: disable=singleton-comparison,not-callable
  25 #pylint: disable=too-many-branches,too-many-arguments,too-many-locals,too-many-statements
  26
  27 def _details_to_bind_params(details: SearchDetails) -> Dict[str, Any]:
  28     """ Create a dictionary from search parameters that can be used
  29         as bind parameter for SQL execute.
  30     """
  31     return {'limit': details.max_results,
  32             'min_rank': details.min_rank,
  33             'max_rank': details.max_rank,
  34             'viewbox': details.viewbox,
  35             'viewbox2': details.viewbox_x2,
  36             'near': details.near,
  37             'near_radius': details.near_radius,
  38             'excluded': details.excluded,
  39             'countries': details.countries}
  40
  41
  42 LIMIT_PARAM: SaBind = sa.bindparam('limit')
  43 MIN_RANK_PARAM: SaBind = sa.bindparam('min_rank')
  44 MAX_RANK_PARAM: SaBind = sa.bindparam('max_rank')
  45 VIEWBOX_PARAM: SaBind = sa.bindparam('viewbox', type_=Geometry)
  46 VIEWBOX2_PARAM: SaBind = sa.bindparam('viewbox2', type_=Geometry)
  47 NEAR_PARAM: SaBind = sa.bindparam('near', type_=Geometry)
  48 NEAR_RADIUS_PARAM: SaBind = sa.bindparam('near_radius')
  49 COUNTRIES_PARAM: SaBind = sa.bindparam('countries')
  50
  51 def _within_near(t: SaFromClause) -> Callable[[], SaExpression]:
  52     return lambda: t.c.geometry.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM)
  53
  54 def _exclude_places(t: SaFromClause) -> Callable[[], SaExpression]:
  55     return lambda: t.c.place_id.not_in(sa.bindparam('excluded'))
  56
  57 def _select_placex(t: SaFromClause) -> SaSelect:
  58     return sa.select(t.c.place_id, t.c.osm_type, t.c.osm_id, t.c.name,
  59                      t.c.class_, t.c.type,
  60                      t.c.address, t.c.extratags,
  61                      t.c.housenumber, t.c.postcode, t.c.country_code,
  62                      t.c.importance, t.c.wikipedia,
  63                      t.c.parent_place_id, t.c.rank_address, t.c.rank_search,
  64                      t.c.centroid,
  65                      t.c.geometry.ST_Expand(0).label('bbox'))
  66
  67
  68 def _add_geometry_columns(sql: SaLambdaSelect, col: SaColumn, details: SearchDetails) -> SaSelect:
  69     out = []
  70
  71     if details.geometry_simplification > 0.0:
  72         col = sa.func.ST_SimplifyPreserveTopology(col, details.geometry_simplification)
  73
  74     if details.geometry_output & GeometryFormat.GEOJSON:
  75         out.append(sa.func.ST_AsGeoJSON(col).label('geometry_geojson'))
  76     if details.geometry_output & GeometryFormat.TEXT:
  77         out.append(sa.func.ST_AsText(col).label('geometry_text'))
  78     if details.geometry_output & GeometryFormat.KML:
  79         out.append(sa.func.ST_AsKML(col).label('geometry_kml'))
  80     if details.geometry_output & GeometryFormat.SVG:
  81         out.append(sa.func.ST_AsSVG(col).label('geometry_svg'))
  82
  83     return sql.add_columns(*out)
  84
  85
  86 def _make_interpolation_subquery(table: SaFromClause, inner: SaFromClause,
  87                                  numerals: List[int], details: SearchDetails) -> SaScalarSelect:
  88     all_ids = array_agg(table.c.place_id) # type: ignore[no-untyped-call]
  89     sql = sa.select(all_ids).where(table.c.parent_place_id == inner.c.place_id)
  90
  91     if len(numerals) == 1:
  92         sql = sql.where(sa.between(numerals[0], table.c.startnumber, table.c.endnumber))\
  93                  .where((numerals[0] - table.c.startnumber) % table.c.step == 0)
  94     else:
  95         sql = sql.where(sa.or_(
  96                 *(sa.and_(sa.between(n, table.c.startnumber, table.c.endnumber),
  97                           (n - table.c.startnumber) % table.c.step == 0)
  98                   for n in numerals)))
  99
 100     if details.excluded:
 101         sql = sql.where(_exclude_places(table))
 102
 103     return sql.scalar_subquery()
 104
 105
 106 def _filter_by_layer(table: SaFromClause, layers: DataLayer) -> SaColumn:
 107     orexpr: List[SaExpression] = []
 108     if layers & DataLayer.ADDRESS and layers & DataLayer.POI:
 109         orexpr.append(table.c.rank_address.between(1, 30))
 110     elif layers & DataLayer.ADDRESS:
 111         orexpr.append(table.c.rank_address.between(1, 29))
 112         orexpr.append(sa.and_(table.c.rank_address == 30,
 113                               sa.or_(table.c.housenumber != None,
 114                                      table.c.address.has_key('housename'))))
 115     elif layers & DataLayer.POI:
 116         orexpr.append(sa.and_(table.c.rank_address == 30,
 117                               table.c.class_.not_in(('place', 'building'))))
 118
 119     if layers & DataLayer.MANMADE:
 120         exclude = []
 121         if not layers & DataLayer.RAILWAY:
 122             exclude.append('railway')
 123         if not layers & DataLayer.NATURAL:
 124             exclude.extend(('natural', 'water', 'waterway'))
 125         orexpr.append(sa.and_(table.c.class_.not_in(tuple(exclude)),
 126                               table.c.rank_address == 0))
 127     else:
 128         include = []
 129         if layers & DataLayer.RAILWAY:
 130             include.append('railway')
 131         if layers & DataLayer.NATURAL:
 132             include.extend(('natural', 'water', 'waterway'))
 133         orexpr.append(sa.and_(table.c.class_.in_(tuple(include)),
 134                               table.c.rank_address == 0))
 135
 136     if len(orexpr) == 1:
 137         return orexpr[0]
 138
 139     return sa.or_(*orexpr)
 140
 141
 142 def _interpolated_position(table: SaFromClause, nr: SaColumn) -> SaColumn:
 143     pos = sa.cast(nr - table.c.startnumber, sa.Float) / (table.c.endnumber - table.c.startnumber)
 144     return sa.case(
 145             (table.c.endnumber == table.c.startnumber, table.c.linegeo.ST_Centroid()),
 146             else_=table.c.linegeo.ST_LineInterpolatePoint(pos)).label('centroid')
 147
 148
 149 async def _get_placex_housenumbers(conn: SearchConnection,
 150                                    place_ids: List[int],
 151                                    details: SearchDetails) -> AsyncIterator[nres.SearchResult]:
 152     t = conn.t.placex
 153     sql = _select_placex(t).where(t.c.place_id.in_(place_ids))
 154
 155     if details.geometry_output:
 156         sql = _add_geometry_columns(sql, t.c.geometry, details)
 157
 158     for row in await conn.execute(sql):
 159         result = nres.create_from_placex_row(row, nres.SearchResult)
 160         assert result
 161         result.bbox = Bbox.from_wkb(row.bbox)
 162         yield result
 163
 164
 165 async def _get_osmline(conn: SearchConnection, place_ids: List[int],
 166                        numerals: List[int],
 167                        details: SearchDetails) -> AsyncIterator[nres.SearchResult]:
 168     t = conn.t.osmline
 169     values = sa.values(sa.Column('nr', sa.Integer()), name='housenumber')\
 170                .data([(n,) for n in numerals])
 171     sql = sa.select(t.c.place_id, t.c.osm_id,
 172                     t.c.parent_place_id, t.c.address,
 173                     values.c.nr.label('housenumber'),
 174                     _interpolated_position(t, values.c.nr),
 175                     t.c.postcode, t.c.country_code)\
 176             .where(t.c.place_id.in_(place_ids))\
 177             .join(values, values.c.nr.between(t.c.startnumber, t.c.endnumber))
 178
 179     if details.geometry_output:
 180         sub = sql.subquery()
 181         sql = _add_geometry_columns(sa.select(sub), sub.c.centroid, details)
 182
 183     for row in await conn.execute(sql):
 184         result = nres.create_from_osmline_row(row, nres.SearchResult)
 185         assert result
 186         yield result
 187
 188
 189 async def _get_tiger(conn: SearchConnection, place_ids: List[int],
 190                      numerals: List[int], osm_id: int,
 191                      details: SearchDetails) -> AsyncIterator[nres.SearchResult]:
 192     t = conn.t.tiger
 193     values = sa.values(sa.Column('nr', sa.Integer()), name='housenumber')\
 194                .data([(n,) for n in numerals])
 195     sql = sa.select(t.c.place_id, t.c.parent_place_id,
 196                     sa.literal('W').label('osm_type'),
 197                     sa.literal(osm_id).label('osm_id'),
 198                     values.c.nr.label('housenumber'),
 199                     _interpolated_position(t, values.c.nr),
 200                     t.c.postcode)\
 201             .where(t.c.place_id.in_(place_ids))\
 202             .join(values, values.c.nr.between(t.c.startnumber, t.c.endnumber))
 203
 204     if details.geometry_output:
 205         sub = sql.subquery()
 206         sql = _add_geometry_columns(sa.select(sub), sub.c.centroid, details)
 207
 208     for row in await conn.execute(sql):
 209         result = nres.create_from_tiger_row(row, nres.SearchResult)
 210         assert result
 211         yield result
 212
 213
 214 class AbstractSearch(abc.ABC):
 215     """ Encapuslation of a single lookup in the database.
 216     """
 217
 218     def __init__(self, penalty: float) -> None:
 219         self.penalty = penalty
 220
 221     @abc.abstractmethod
 222     async def lookup(self, conn: SearchConnection,
 223                      details: SearchDetails) -> nres.SearchResults:
 224         """ Find results for the search in the database.
 225         """
 226
 227
 228 class NearSearch(AbstractSearch):
 229     """ Category search of a place type near the result of another search.
 230     """
 231     def __init__(self, penalty: float, categories: WeightedCategories,
 232                  search: AbstractSearch) -> None:
 233         super().__init__(penalty)
 234         self.search = search
 235         self.categories = categories
 236
 237
 238     async def lookup(self, conn: SearchConnection,
 239                      details: SearchDetails) -> nres.SearchResults:
 240         """ Find results for the search in the database.
 241         """
 242         results = nres.SearchResults()
 243         base = await self.search.lookup(conn, details)
 244
 245         if not base:
 246             return results
 247
 248         base.sort(key=lambda r: (r.accuracy, r.rank_search))
 249         max_accuracy = base[0].accuracy + 0.5
 250         base = nres.SearchResults(r for r in base if r.source_table == nres.SourceTable.PLACEX
 251                                                      and r.accuracy <= max_accuracy
 252                                                      and r.bbox and r.bbox.area < 20)
 253
 254         if base:
 255             baseids = [b.place_id for b in base[:5] if b.place_id]
 256
 257             for category, penalty in self.categories:
 258                 await self.lookup_category(results, conn, baseids, category, penalty, details)
 259                 if len(results) >= details.max_results:
 260                     break
 261
 262         return results
 263
 264
 265     async def lookup_category(self, results: nres.SearchResults,
 266                               conn: SearchConnection, ids: List[int],
 267                               category: Tuple[str, str], penalty: float,
 268                               details: SearchDetails) -> None:
 269         """ Find places of the given category near the list of
 270             place ids and add the results to 'results'.
 271         """
 272         table = await conn.get_class_table(*category)
 273
 274         t = conn.t.placex.alias('p')
 275         tgeom = conn.t.placex.alias('pgeom')
 276
 277         sql = _select_placex(t).where(tgeom.c.place_id.in_(ids))\
 278                                .where(t.c.class_ == category[0])\
 279                                .where(t.c.type == category[1])
 280
 281         if table is None:
 282             # No classtype table available, do a simplified lookup in placex.
 283             sql = sql.join(tgeom, t.c.geometry.ST_DWithin(tgeom.c.centroid, 0.01))\
 284                      .order_by(tgeom.c.centroid.ST_Distance(t.c.centroid))
 285         else:
 286             # Use classtype table. We can afford to use a larger
 287             # radius for the lookup.
 288             sql = sql.join(table, t.c.place_id == table.c.place_id)\
 289                      .join(tgeom,
 290                            table.c.centroid.ST_CoveredBy(
 291                                sa.case((sa.and_(tgeom.c.rank_address < 9,
 292                                                 tgeom.c.geometry.is_area()),
 293                                         tgeom.c.geometry),
 294                                        else_ = tgeom.c.centroid.ST_Expand(0.05))))\
 295                      .order_by(tgeom.c.centroid.ST_Distance(table.c.centroid))
 296
 297         sql = sql.where(t.c.rank_address.between(MIN_RANK_PARAM, MAX_RANK_PARAM))
 298         if details.countries:
 299             sql = sql.where(t.c.country_code.in_(COUNTRIES_PARAM))
 300         if details.excluded:
 301             sql = sql.where(_exclude_places(t))
 302         if details.layers is not None:
 303             sql = sql.where(_filter_by_layer(t, details.layers))
 304
 305         sql = sql.limit(LIMIT_PARAM)
 306         for row in await conn.execute(sql, _details_to_bind_params(details)):
 307             result = nres.create_from_placex_row(row, nres.SearchResult)
 308             assert result
 309             result.accuracy = self.penalty + penalty
 310             result.bbox = Bbox.from_wkb(row.bbox)
 311             results.append(result)
 312
 313
 314
 315 class PoiSearch(AbstractSearch):
 316     """ Category search in a geographic area.
 317     """
 318     def __init__(self, sdata: SearchData) -> None:
 319         super().__init__(sdata.penalty)
 320         self.qualifiers = sdata.qualifiers
 321         self.countries = sdata.countries
 322
 323
 324     async def lookup(self, conn: SearchConnection,
 325                      details: SearchDetails) -> nres.SearchResults:
 326         """ Find results for the search in the database.
 327         """
 328         bind_params = _details_to_bind_params(details)
 329         t = conn.t.placex
 330
 331         rows: List[SaRow] = []
 332
 333         if details.near and details.near_radius is not None and details.near_radius < 0.2:
 334             # simply search in placex table
 335             def _base_query() -> SaSelect:
 336                 return _select_placex(t) \
 337                            .where(t.c.linked_place_id == None) \
 338                            .where(t.c.geometry.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM)) \
 339                            .order_by(t.c.centroid.ST_Distance(NEAR_PARAM)) \
 340                            .limit(LIMIT_PARAM)
 341
 342             classtype = self.qualifiers.values
 343             if len(classtype) == 1:
 344                 cclass, ctype = classtype[0]
 345                 sql: SaLambdaSelect = sa.lambda_stmt(lambda: _base_query()
 346                                                  .where(t.c.class_ == cclass)
 347                                                  .where(t.c.type == ctype))
 348             else:
 349                 sql = _base_query().where(sa.or_(*(sa.and_(t.c.class_ == cls, t.c.type == typ)
 350                                                    for cls, typ in classtype)))
 351
 352             if self.countries:
 353                 sql = sql.where(t.c.country_code.in_(self.countries.values))
 354
 355             if details.viewbox is not None and details.bounded_viewbox:
 356                 sql = sql.where(t.c.geometry.intersects(VIEWBOX_PARAM))
 357
 358             rows.extend(await conn.execute(sql, bind_params))
 359         else:
 360             # use the class type tables
 361             for category in self.qualifiers.values:
 362                 table = await conn.get_class_table(*category)
 363                 if table is not None:
 364                     sql = _select_placex(t)\
 365                                .join(table, t.c.place_id == table.c.place_id)\
 366                                .where(t.c.class_ == category[0])\
 367                                .where(t.c.type == category[1])
 368
 369                     if details.viewbox is not None and details.bounded_viewbox:
 370                         sql = sql.where(table.c.centroid.intersects(VIEWBOX_PARAM))
 371
 372                     if details.near and details.near_radius is not None:
 373                         sql = sql.order_by(table.c.centroid.ST_Distance(NEAR_PARAM))\
 374                                  .where(table.c.centroid.ST_DWithin(NEAR_PARAM,
 375                                                                     NEAR_RADIUS_PARAM))
 376
 377                     if self.countries:
 378                         sql = sql.where(t.c.country_code.in_(self.countries.values))
 379
 380                     sql = sql.limit(LIMIT_PARAM)
 381                     rows.extend(await conn.execute(sql, bind_params))
 382
 383         results = nres.SearchResults()
 384         for row in rows:
 385             result = nres.create_from_placex_row(row, nres.SearchResult)
 386             assert result
 387             result.accuracy = self.penalty + self.qualifiers.get_penalty((row.class_, row.type))
 388             result.bbox = Bbox.from_wkb(row.bbox)
 389             results.append(result)
 390
 391         return results
 392
 393
 394 class CountrySearch(AbstractSearch):
 395     """ Search for a country name or country code.
 396     """
 397     def __init__(self, sdata: SearchData) -> None:
 398         super().__init__(sdata.penalty)
 399         self.countries = sdata.countries
 400
 401
 402     async def lookup(self, conn: SearchConnection,
 403                      details: SearchDetails) -> nres.SearchResults:
 404         """ Find results for the search in the database.
 405         """
 406         t = conn.t.placex
 407
 408         ccodes = self.countries.values
 409         sql = _select_placex(t)\
 410                 .where(t.c.country_code.in_(ccodes))\
 411                 .where(t.c.rank_address == 4)
 412
 413         if details.geometry_output:
 414             sql = _add_geometry_columns(sql, t.c.geometry, details)
 415
 416         if details.excluded:
 417             sql = sql.where(_exclude_places(t))
 418
 419         if details.viewbox is not None and details.bounded_viewbox:
 420             sql = sql.where(lambda: t.c.geometry.intersects(VIEWBOX_PARAM))
 421
 422         if details.near is not None and details.near_radius is not None:
 423             sql = sql.where(_within_near(t))
 424
 425         results = nres.SearchResults()
 426         for row in await conn.execute(sql, _details_to_bind_params(details)):
 427             result = nres.create_from_placex_row(row, nres.SearchResult)
 428             assert result
 429             result.accuracy = self.penalty + self.countries.get_penalty(row.country_code, 5.0)
 430             results.append(result)
 431
 432         return results or await self.lookup_in_country_table(conn, details)
 433
 434
 435     async def lookup_in_country_table(self, conn: SearchConnection,
 436                                       details: SearchDetails) -> nres.SearchResults:
 437         """ Look up the country in the fallback country tables.
 438         """
 439         # Avoid the fallback search when this is a more search. Country results
 440         # usually are in the first batch of results and it is not possible
 441         # to exclude these fallbacks.
 442         if details.excluded:
 443             return nres.SearchResults()
 444
 445         t = conn.t.country_name
 446         tgrid = conn.t.country_grid
 447
 448         sql = sa.select(tgrid.c.country_code,
 449                         tgrid.c.geometry.ST_Centroid().ST_Collect().ST_Centroid()
 450                               .label('centroid'))\
 451                 .where(tgrid.c.country_code.in_(self.countries.values))\
 452                 .group_by(tgrid.c.country_code)
 453
 454         if details.viewbox is not None and details.bounded_viewbox:
 455             sql = sql.where(tgrid.c.geometry.intersects(VIEWBOX_PARAM))
 456         if details.near is not None and details.near_radius is not None:
 457             sql = sql.where(_within_near(tgrid))
 458
 459         sub = sql.subquery('grid')
 460
 461         sql = sa.select(t.c.country_code,
 462                         (t.c.name
 463                          + sa.func.coalesce(t.c.derived_name,
 464                                             sa.cast('', type_=conn.t.types.Composite))
 465                         ).label('name'),
 466                         sub.c.centroid)\
 467                 .join(sub, t.c.country_code == sub.c.country_code)
 468
 469         results = nres.SearchResults()
 470         for row in await conn.execute(sql, _details_to_bind_params(details)):
 471             result = nres.create_from_country_row(row, nres.SearchResult)
 472             assert result
 473             result.accuracy = self.penalty + self.countries.get_penalty(row.country_code, 5.0)
 474             results.append(result)
 475
 476         return results
 477
 478
 479
 480 class PostcodeSearch(AbstractSearch):
 481     """ Search for a postcode.
 482     """
 483     def __init__(self, extra_penalty: float, sdata: SearchData) -> None:
 484         super().__init__(sdata.penalty + extra_penalty)
 485         self.countries = sdata.countries
 486         self.postcodes = sdata.postcodes
 487         self.lookups = sdata.lookups
 488         self.rankings = sdata.rankings
 489
 490
 491     async def lookup(self, conn: SearchConnection,
 492                      details: SearchDetails) -> nres.SearchResults:
 493         """ Find results for the search in the database.
 494         """
 495         t = conn.t.postcode
 496         pcs = self.postcodes.values
 497
 498         sql = sa.select(t.c.place_id, t.c.parent_place_id,
 499                         t.c.rank_search, t.c.rank_address,
 500                         t.c.postcode, t.c.country_code,
 501                         t.c.geometry.label('centroid'))\
 502                 .where(t.c.postcode.in_(pcs))
 503
 504         if details.geometry_output:
 505             sql = _add_geometry_columns(sql, t.c.geometry, details)
 506
 507         penalty: SaExpression = sa.literal(self.penalty)
 508
 509         if details.viewbox is not None:
 510             if details.bounded_viewbox:
 511                 sql = sql.where(t.c.geometry.intersects(VIEWBOX_PARAM))
 512             else:
 513                 penalty += sa.case((t.c.geometry.intersects(VIEWBOX_PARAM), 0.0),
 514                                    (t.c.geometry.intersects(VIEWBOX2_PARAM), 1.0),
 515                                    else_=2.0)
 516
 517         if details.near is not None:
 518             if details.near_radius is not None:
 519                 sql = sql.where(_within_near(t))
 520             sql = sql.order_by(t.c.geometry.ST_Distance(NEAR_PARAM))
 521
 522         if self.countries:
 523             sql = sql.where(t.c.country_code.in_(self.countries.values))
 524
 525         if details.excluded:
 526             sql = sql.where(_exclude_places(t))
 527
 528         if self.lookups:
 529             assert len(self.lookups) == 1
 530             assert self.lookups[0].lookup_type == 'restrict'
 531             tsearch = conn.t.search_name
 532             sql = sql.where(tsearch.c.place_id == t.c.parent_place_id)\
 533                      .where(sa.func.array_cat(tsearch.c.name_vector,
 534                                               tsearch.c.nameaddress_vector,
 535                                               type_=ARRAY(sa.Integer))
 536                                     .contains(self.lookups[0].tokens))
 537
 538         for ranking in self.rankings:
 539             penalty += ranking.sql_penalty(conn.t.search_name)
 540         penalty += sa.case(*((t.c.postcode == v, p) for v, p in self.postcodes),
 541                        else_=1.0)
 542
 543
 544         sql = sql.add_columns(penalty.label('accuracy'))
 545         sql = sql.order_by('accuracy').limit(LIMIT_PARAM)
 546
 547         results = nres.SearchResults()
 548         for row in await conn.execute(sql, _details_to_bind_params(details)):
 549             result = nres.create_from_postcode_row(row, nres.SearchResult)
 550             assert result
 551             result.accuracy = row.accuracy
 552             results.append(result)
 553
 554         return results
 555
 556
 557
 558 class PlaceSearch(AbstractSearch):
 559     """ Generic search for an address or named place.
 560     """
 561     def __init__(self, extra_penalty: float, sdata: SearchData, expected_count: int) -> None:
 562         super().__init__(sdata.penalty + extra_penalty)
 563         self.countries = sdata.countries
 564         self.postcodes = sdata.postcodes
 565         self.housenumbers = sdata.housenumbers
 566         self.qualifiers = sdata.qualifiers
 567         self.lookups = sdata.lookups
 568         self.rankings = sdata.rankings
 569         self.expected_count = expected_count
 570
 571
 572     async def lookup(self, conn: SearchConnection,
 573                      details: SearchDetails) -> nres.SearchResults:
 574         """ Find results for the search in the database.
 575         """
 576         t = conn.t.placex
 577         tsearch = conn.t.search_name
 578
 579         sql: SaLambdaSelect = sa.lambda_stmt(lambda:
 580                   sa.select(t.c.place_id, t.c.osm_type, t.c.osm_id, t.c.name,
 581                             t.c.class_, t.c.type,
 582                             t.c.address, t.c.extratags,
 583                             t.c.housenumber, t.c.postcode, t.c.country_code,
 584                             t.c.wikipedia,
 585                             t.c.parent_place_id, t.c.rank_address, t.c.rank_search,
 586                             t.c.centroid,
 587                             t.c.geometry.ST_Expand(0).label('bbox'))
 588                    .where(t.c.place_id == tsearch.c.place_id))
 589
 590
 591         if details.geometry_output:
 592             sql = _add_geometry_columns(sql, t.c.geometry, details)
 593
 594         penalty: SaExpression = sa.literal(self.penalty)
 595         for ranking in self.rankings:
 596             penalty += ranking.sql_penalty(tsearch)
 597
 598         for lookup in self.lookups:
 599             sql = sql.where(lookup.sql_condition(tsearch))
 600
 601         if self.countries:
 602             sql = sql.where(tsearch.c.country_code.in_(self.countries.values))
 603
 604         if self.postcodes:
 605             # if a postcode is given, don't search for state or country level objects
 606             sql = sql.where(tsearch.c.address_rank > 9)
 607             tpc = conn.t.postcode
 608             pcs = self.postcodes.values
 609             if self.expected_count > 1000:
 610                 # Many results expected. Restrict by postcode.
 611                 sql = sql.where(sa.select(tpc.c.postcode)
 612                                   .where(tpc.c.postcode.in_(pcs))
 613                                   .where(tsearch.c.centroid.ST_DWithin(tpc.c.geometry, 0.12))
 614                                   .exists())
 615
 616             # Less results, only have a preference for close postcodes
 617             pc_near = sa.select(sa.func.min(tpc.c.geometry.ST_Distance(tsearch.c.centroid)))\
 618                       .where(tpc.c.postcode.in_(pcs))\
 619                       .scalar_subquery()
 620             penalty += sa.case((t.c.postcode.in_(pcs), 0.0),
 621                                else_=sa.func.coalesce(pc_near, 2.0))
 622
 623         if details.viewbox is not None:
 624             if details.bounded_viewbox:
 625                 if details.viewbox.area < 0.2:
 626                     sql = sql.where(tsearch.c.centroid.intersects(VIEWBOX_PARAM))
 627                 else:
 628                     sql = sql.where(tsearch.c.centroid.ST_Intersects_no_index(VIEWBOX_PARAM))
 629             else:
 630                 penalty += sa.case((t.c.geometry.intersects(VIEWBOX_PARAM), 0.0),
 631                                    (t.c.geometry.intersects(VIEWBOX2_PARAM), 1.0),
 632                                    else_=2.0)
 633
 634         if details.near is not None:
 635             if details.near_radius is not None:
 636                 if details.near_radius < 0.1:
 637                     sql = sql.where(tsearch.c.centroid.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM))
 638                 else:
 639                     sql = sql.where(tsearch.c.centroid.ST_DWithin_no_index(NEAR_PARAM,
 640                                                                            NEAR_RADIUS_PARAM))
 641             sql = sql.add_columns(-tsearch.c.centroid.ST_Distance(NEAR_PARAM)
 642                                       .label('importance'))
 643             sql = sql.order_by(sa.desc(sa.text('importance')))
 644         else:
 645             sql = sql.order_by(penalty - sa.case((tsearch.c.importance > 0, tsearch.c.importance),
 646                                   else_=0.75001-(sa.cast(tsearch.c.search_rank, sa.Float())/40)))
 647             sql = sql.add_columns(t.c.importance)
 648
 649
 650         sql = sql.add_columns(penalty.label('accuracy'))\
 651                  .order_by(sa.text('accuracy'))
 652
 653         if self.housenumbers:
 654             hnr_regexp = f"\\m({'|'.join(self.housenumbers.values)})\\M"
 655             sql = sql.where(tsearch.c.address_rank.between(16, 30))\
 656                      .where(sa.or_(tsearch.c.address_rank < 30,
 657                                    t.c.housenumber.op('~*')(hnr_regexp)))
 658
 659             # Cross check for housenumbers, need to do that on a rather large
 660             # set. Worst case there are 40.000 main streets in OSM.
 661             inner = sql.limit(10000).subquery()
 662
 663             # Housenumbers from placex
 664             thnr = conn.t.placex.alias('hnr')
 665             pid_list = array_agg(thnr.c.place_id) # type: ignore[no-untyped-call]
 666             place_sql = sa.select(pid_list)\
 667                           .where(thnr.c.parent_place_id == inner.c.place_id)\
 668                           .where(thnr.c.housenumber.op('~*')(hnr_regexp))\
 669                           .where(thnr.c.linked_place_id == None)\
 670                           .where(thnr.c.indexed_status == 0)
 671
 672             if details.excluded:
 673                 place_sql = place_sql.where(_exclude_places(thnr))
 674             if self.qualifiers:
 675                 place_sql = place_sql.where(self.qualifiers.sql_restrict(thnr))
 676
 677             numerals = [int(n) for n in self.housenumbers.values if n.isdigit()]
 678             interpol_sql: SaColumn
 679             tiger_sql: SaColumn
 680             if numerals and \
 681                (not self.qualifiers or ('place', 'house') in self.qualifiers.values):
 682                 # Housenumbers from interpolations
 683                 interpol_sql = _make_interpolation_subquery(conn.t.osmline, inner,
 684                                                             numerals, details)
 685                 # Housenumbers from Tiger
 686                 tiger_sql = sa.case((inner.c.country_code == 'us',
 687                                      _make_interpolation_subquery(conn.t.tiger, inner,
 688                                                                   numerals, details)
 689                                     ), else_=None)
 690             else:
 691                 interpol_sql = sa.null()
 692                 tiger_sql = sa.null()
 693
 694             unsort = sa.select(inner, place_sql.scalar_subquery().label('placex_hnr'),
 695                                interpol_sql.label('interpol_hnr'),
 696                                tiger_sql.label('tiger_hnr')).subquery('unsort')
 697             sql = sa.select(unsort)\
 698                     .order_by(sa.case((unsort.c.placex_hnr != None, 1),
 699                                       (unsort.c.interpol_hnr != None, 2),
 700                                       (unsort.c.tiger_hnr != None, 3),
 701                                       else_=4),
 702                               unsort.c.accuracy)
 703         else:
 704             sql = sql.where(t.c.linked_place_id == None)\
 705                      .where(t.c.indexed_status == 0)
 706             if self.qualifiers:
 707                 sql = sql.where(self.qualifiers.sql_restrict(t))
 708             if details.excluded:
 709                 sql = sql.where(_exclude_places(tsearch))
 710             if details.min_rank > 0:
 711                 sql = sql.where(sa.or_(tsearch.c.address_rank >= MIN_RANK_PARAM,
 712                                        tsearch.c.search_rank >= MIN_RANK_PARAM))
 713             if details.max_rank < 30:
 714                 sql = sql.where(sa.or_(tsearch.c.address_rank <= MAX_RANK_PARAM,
 715                                        tsearch.c.search_rank <= MAX_RANK_PARAM))
 716             if details.layers is not None:
 717                 sql = sql.where(_filter_by_layer(t, details.layers))
 718
 719         sql = sql.limit(LIMIT_PARAM)
 720
 721         results = nres.SearchResults()
 722         for row in await conn.execute(sql, _details_to_bind_params(details)):
 723             result = nres.create_from_placex_row(row, nres.SearchResult)
 724             assert result
 725             result.bbox = Bbox.from_wkb(row.bbox)
 726             result.accuracy = row.accuracy
 727             if not details.excluded or not result.place_id in details.excluded:
 728                 results.append(result)
 729
 730             if self.housenumbers and row.rank_address < 30:
 731                 if row.placex_hnr:
 732                     subs = _get_placex_housenumbers(conn, row.placex_hnr, details)
 733                 elif row.interpol_hnr:
 734                     subs = _get_osmline(conn, row.interpol_hnr, numerals, details)
 735                 elif row.tiger_hnr:
 736                     subs = _get_tiger(conn, row.tiger_hnr, numerals, row.osm_id, details)
 737                 else:
 738                     subs = None
 739
 740                 if subs is not None:
 741                     async for sub in subs:
 742                         assert sub.housenumber
 743                         sub.accuracy = result.accuracy
 744                         if not any(nr in self.housenumbers.values
 745                                    for nr in sub.housenumber.split(';')):
 746                             sub.accuracy += 0.6
 747                         results.append(sub)
 748
 749                 result.accuracy += 1.0 # penalty for missing housenumber
 750
 751         return results