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 no_index(expr: SaColumn) -> SaColumn:
  28     """ Wrap the given expression, so that the query planner will
  29         refrain from using the expression for index lookup.
  30     """
  31     return sa.func.coalesce(sa.null(), expr) # pylint: disable=not-callable
  32
  33
  34 def _details_to_bind_params(details: SearchDetails) -> Dict[str, Any]:
  35     """ Create a dictionary from search parameters that can be used
  36         as bind parameter for SQL execute.
  37     """
  38     return {'limit': details.max_results,
  39             'min_rank': details.min_rank,
  40             'max_rank': details.max_rank,
  41             'viewbox': details.viewbox,
  42             'viewbox2': details.viewbox_x2,
  43             'near': details.near,
  44             'near_radius': details.near_radius,
  45             'excluded': details.excluded,
  46             'countries': details.countries}
  47
  48
  49 LIMIT_PARAM: SaBind = sa.bindparam('limit')
  50 MIN_RANK_PARAM: SaBind = sa.bindparam('min_rank')
  51 MAX_RANK_PARAM: SaBind = sa.bindparam('max_rank')
  52 VIEWBOX_PARAM: SaBind = sa.bindparam('viewbox', type_=Geometry)
  53 VIEWBOX2_PARAM: SaBind = sa.bindparam('viewbox2', type_=Geometry)
  54 NEAR_PARAM: SaBind = sa.bindparam('near', type_=Geometry)
  55 NEAR_RADIUS_PARAM: SaBind = sa.bindparam('near_radius')
  56 COUNTRIES_PARAM: SaBind = sa.bindparam('countries')
  57
  58 def _within_near(t: SaFromClause) -> Callable[[], SaExpression]:
  59     return lambda: t.c.geometry.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM)
  60
  61 def _exclude_places(t: SaFromClause) -> Callable[[], SaExpression]:
  62     return lambda: t.c.place_id.not_in(sa.bindparam('excluded'))
  63
  64 def _select_placex(t: SaFromClause) -> SaSelect:
  65     return sa.select(t.c.place_id, t.c.osm_type, t.c.osm_id, t.c.name,
  66                      t.c.class_, t.c.type,
  67                      t.c.address, t.c.extratags,
  68                      t.c.housenumber, t.c.postcode, t.c.country_code,
  69                      t.c.importance, t.c.wikipedia,
  70                      t.c.parent_place_id, t.c.rank_address, t.c.rank_search,
  71                      t.c.linked_place_id, t.c.admin_level,
  72                      t.c.centroid,
  73                      t.c.geometry.ST_Expand(0).label('bbox'))
  74
  75
  76 def _add_geometry_columns(sql: SaLambdaSelect, col: SaColumn, details: SearchDetails) -> SaSelect:
  77     out = []
  78
  79     if details.geometry_simplification > 0.0:
  80         col = sa.func.ST_SimplifyPreserveTopology(col, details.geometry_simplification)
  81
  82     if details.geometry_output & GeometryFormat.GEOJSON:
  83         out.append(sa.func.ST_AsGeoJSON(col, 7).label('geometry_geojson'))
  84     if details.geometry_output & GeometryFormat.TEXT:
  85         out.append(sa.func.ST_AsText(col).label('geometry_text'))
  86     if details.geometry_output & GeometryFormat.KML:
  87         out.append(sa.func.ST_AsKML(col, 7).label('geometry_kml'))
  88     if details.geometry_output & GeometryFormat.SVG:
  89         out.append(sa.func.ST_AsSVG(col, 0, 7).label('geometry_svg'))
  90
  91     return sql.add_columns(*out)
  92
  93
  94 def _make_interpolation_subquery(table: SaFromClause, inner: SaFromClause,
  95                                  numerals: List[int], details: SearchDetails) -> SaScalarSelect:
  96     all_ids = array_agg(table.c.place_id) # type: ignore[no-untyped-call]
  97     sql = sa.select(all_ids).where(table.c.parent_place_id == inner.c.place_id)
  98
  99     if len(numerals) == 1:
 100         sql = sql.where(sa.between(numerals[0], table.c.startnumber, table.c.endnumber))\
 101                  .where((numerals[0] - table.c.startnumber) % table.c.step == 0)
 102     else:
 103         sql = sql.where(sa.or_(
 104                 *(sa.and_(sa.between(n, table.c.startnumber, table.c.endnumber),
 105                           (n - table.c.startnumber) % table.c.step == 0)
 106                   for n in numerals)))
 107
 108     if details.excluded:
 109         sql = sql.where(_exclude_places(table))
 110
 111     return sql.scalar_subquery()
 112
 113
 114 def _filter_by_layer(table: SaFromClause, layers: DataLayer) -> SaColumn:
 115     orexpr: List[SaExpression] = []
 116     if layers & DataLayer.ADDRESS and layers & DataLayer.POI:
 117         orexpr.append(no_index(table.c.rank_address).between(1, 30))
 118     elif layers & DataLayer.ADDRESS:
 119         orexpr.append(no_index(table.c.rank_address).between(1, 29))
 120         orexpr.append(sa.and_(no_index(table.c.rank_address) == 30,
 121                               sa.or_(table.c.housenumber != None,
 122                                      table.c.address.has_key('addr:housename'))))
 123     elif layers & DataLayer.POI:
 124         orexpr.append(sa.and_(no_index(table.c.rank_address) == 30,
 125                               table.c.class_.not_in(('place', 'building'))))
 126
 127     if layers & DataLayer.MANMADE:
 128         exclude = []
 129         if not layers & DataLayer.RAILWAY:
 130             exclude.append('railway')
 131         if not layers & DataLayer.NATURAL:
 132             exclude.extend(('natural', 'water', 'waterway'))
 133         orexpr.append(sa.and_(table.c.class_.not_in(tuple(exclude)),
 134                               no_index(table.c.rank_address) == 0))
 135     else:
 136         include = []
 137         if layers & DataLayer.RAILWAY:
 138             include.append('railway')
 139         if layers & DataLayer.NATURAL:
 140             include.extend(('natural', 'water', 'waterway'))
 141         orexpr.append(sa.and_(table.c.class_.in_(tuple(include)),
 142                               no_index(table.c.rank_address) == 0))
 143
 144     if len(orexpr) == 1:
 145         return orexpr[0]
 146
 147     return sa.or_(*orexpr)
 148
 149
 150 def _interpolated_position(table: SaFromClause, nr: SaColumn) -> SaColumn:
 151     pos = sa.cast(nr - table.c.startnumber, sa.Float) / (table.c.endnumber - table.c.startnumber)
 152     return sa.case(
 153             (table.c.endnumber == table.c.startnumber, table.c.linegeo.ST_Centroid()),
 154             else_=table.c.linegeo.ST_LineInterpolatePoint(pos)).label('centroid')
 155
 156
 157 async def _get_placex_housenumbers(conn: SearchConnection,
 158                                    place_ids: List[int],
 159                                    details: SearchDetails) -> AsyncIterator[nres.SearchResult]:
 160     t = conn.t.placex
 161     sql = _select_placex(t).where(t.c.place_id.in_(place_ids))
 162
 163     if details.geometry_output:
 164         sql = _add_geometry_columns(sql, t.c.geometry, details)
 165
 166     for row in await conn.execute(sql):
 167         result = nres.create_from_placex_row(row, nres.SearchResult)
 168         assert result
 169         result.bbox = Bbox.from_wkb(row.bbox)
 170         yield result
 171
 172
 173 async def _get_osmline(conn: SearchConnection, place_ids: List[int],
 174                        numerals: List[int],
 175                        details: SearchDetails) -> AsyncIterator[nres.SearchResult]:
 176     t = conn.t.osmline
 177     values = sa.values(sa.Column('nr', sa.Integer()), name='housenumber')\
 178                .data([(n,) for n in numerals])
 179     sql = sa.select(t.c.place_id, t.c.osm_id,
 180                     t.c.parent_place_id, t.c.address,
 181                     values.c.nr.label('housenumber'),
 182                     _interpolated_position(t, values.c.nr),
 183                     t.c.postcode, t.c.country_code)\
 184             .where(t.c.place_id.in_(place_ids))\
 185             .join(values, values.c.nr.between(t.c.startnumber, t.c.endnumber))
 186
 187     if details.geometry_output:
 188         sub = sql.subquery()
 189         sql = _add_geometry_columns(sa.select(sub), sub.c.centroid, details)
 190
 191     for row in await conn.execute(sql):
 192         result = nres.create_from_osmline_row(row, nres.SearchResult)
 193         assert result
 194         yield result
 195
 196
 197 async def _get_tiger(conn: SearchConnection, place_ids: List[int],
 198                      numerals: List[int], osm_id: int,
 199                      details: SearchDetails) -> AsyncIterator[nres.SearchResult]:
 200     t = conn.t.tiger
 201     values = sa.values(sa.Column('nr', sa.Integer()), name='housenumber')\
 202                .data([(n,) for n in numerals])
 203     sql = sa.select(t.c.place_id, t.c.parent_place_id,
 204                     sa.literal('W').label('osm_type'),
 205                     sa.literal(osm_id).label('osm_id'),
 206                     values.c.nr.label('housenumber'),
 207                     _interpolated_position(t, values.c.nr),
 208                     t.c.postcode)\
 209             .where(t.c.place_id.in_(place_ids))\
 210             .join(values, values.c.nr.between(t.c.startnumber, t.c.endnumber))
 211
 212     if details.geometry_output:
 213         sub = sql.subquery()
 214         sql = _add_geometry_columns(sa.select(sub), sub.c.centroid, details)
 215
 216     for row in await conn.execute(sql):
 217         result = nres.create_from_tiger_row(row, nres.SearchResult)
 218         assert result
 219         yield result
 220
 221
 222 class AbstractSearch(abc.ABC):
 223     """ Encapuslation of a single lookup in the database.
 224     """
 225
 226     def __init__(self, penalty: float) -> None:
 227         self.penalty = penalty
 228
 229     @abc.abstractmethod
 230     async def lookup(self, conn: SearchConnection,
 231                      details: SearchDetails) -> nres.SearchResults:
 232         """ Find results for the search in the database.
 233         """
 234
 235
 236 class NearSearch(AbstractSearch):
 237     """ Category search of a place type near the result of another search.
 238     """
 239     def __init__(self, penalty: float, categories: WeightedCategories,
 240                  search: AbstractSearch) -> None:
 241         super().__init__(penalty)
 242         self.search = search
 243         self.categories = categories
 244
 245
 246     async def lookup(self, conn: SearchConnection,
 247                      details: SearchDetails) -> nres.SearchResults:
 248         """ Find results for the search in the database.
 249         """
 250         results = nres.SearchResults()
 251         base = await self.search.lookup(conn, details)
 252
 253         if not base:
 254             return results
 255
 256         base.sort(key=lambda r: (r.accuracy, r.rank_search))
 257         max_accuracy = base[0].accuracy + 0.5
 258         base = nres.SearchResults(r for r in base if r.source_table == nres.SourceTable.PLACEX
 259                                                      and r.accuracy <= max_accuracy
 260                                                      and r.bbox and r.bbox.area < 20)
 261
 262         if base:
 263             baseids = [b.place_id for b in base[:5] if b.place_id]
 264
 265             for category, penalty in self.categories:
 266                 await self.lookup_category(results, conn, baseids, category, penalty, details)
 267                 if len(results) >= details.max_results:
 268                     break
 269
 270         return results
 271
 272
 273     async def lookup_category(self, results: nres.SearchResults,
 274                               conn: SearchConnection, ids: List[int],
 275                               category: Tuple[str, str], penalty: float,
 276                               details: SearchDetails) -> None:
 277         """ Find places of the given category near the list of
 278             place ids and add the results to 'results'.
 279         """
 280         table = await conn.get_class_table(*category)
 281
 282         t = conn.t.placex
 283         tgeom = conn.t.placex.alias('pgeom')
 284
 285         sql = _select_placex(t).where(tgeom.c.place_id.in_(ids))\
 286                                .where(t.c.class_ == category[0])\
 287                                .where(t.c.type == category[1])
 288
 289         if table is None:
 290             # No classtype table available, do a simplified lookup in placex.
 291             sql = sql.join(tgeom, t.c.geometry.ST_DWithin(tgeom.c.centroid, 0.01))\
 292                      .order_by(tgeom.c.centroid.ST_Distance(t.c.centroid))
 293         else:
 294             # Use classtype table. We can afford to use a larger
 295             # radius for the lookup.
 296             sql = sql.join(table, t.c.place_id == table.c.place_id)\
 297                      .join(tgeom,
 298                            table.c.centroid.ST_CoveredBy(
 299                                sa.case((sa.and_(tgeom.c.rank_address < 9,
 300                                                 tgeom.c.geometry.is_area()),
 301                                         tgeom.c.geometry),
 302                                        else_ = tgeom.c.centroid.ST_Expand(0.05))))\
 303                      .order_by(tgeom.c.centroid.ST_Distance(table.c.centroid))
 304
 305         sql = sql.where(no_index(t.c.rank_address).between(MIN_RANK_PARAM, MAX_RANK_PARAM))
 306         if details.countries:
 307             sql = sql.where(t.c.country_code.in_(COUNTRIES_PARAM))
 308         if details.excluded:
 309             sql = sql.where(_exclude_places(t))
 310         if details.layers is not None:
 311             sql = sql.where(_filter_by_layer(t, details.layers))
 312
 313         sql = sql.limit(LIMIT_PARAM)
 314         for row in await conn.execute(sql, _details_to_bind_params(details)):
 315             result = nres.create_from_placex_row(row, nres.SearchResult)
 316             assert result
 317             result.accuracy = self.penalty + penalty
 318             result.bbox = Bbox.from_wkb(row.bbox)
 319             results.append(result)
 320
 321
 322
 323 class PoiSearch(AbstractSearch):
 324     """ Category search in a geographic area.
 325     """
 326     def __init__(self, sdata: SearchData) -> None:
 327         super().__init__(sdata.penalty)
 328         self.qualifiers = sdata.qualifiers
 329         self.countries = sdata.countries
 330
 331
 332     async def lookup(self, conn: SearchConnection,
 333                      details: SearchDetails) -> nres.SearchResults:
 334         """ Find results for the search in the database.
 335         """
 336         bind_params = _details_to_bind_params(details)
 337         t = conn.t.placex
 338
 339         rows: List[SaRow] = []
 340
 341         if details.near and details.near_radius is not None and details.near_radius < 0.2:
 342             # simply search in placex table
 343             def _base_query() -> SaSelect:
 344                 return _select_placex(t) \
 345                            .where(t.c.linked_place_id == None) \
 346                            .where(t.c.geometry.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM)) \
 347                            .order_by(t.c.centroid.ST_Distance(NEAR_PARAM)) \
 348                            .limit(LIMIT_PARAM)
 349
 350             classtype = self.qualifiers.values
 351             if len(classtype) == 1:
 352                 cclass, ctype = classtype[0]
 353                 sql: SaLambdaSelect = sa.lambda_stmt(lambda: _base_query()
 354                                                  .where(t.c.class_ == cclass)
 355                                                  .where(t.c.type == ctype))
 356             else:
 357                 sql = _base_query().where(sa.or_(*(sa.and_(t.c.class_ == cls, t.c.type == typ)
 358                                                    for cls, typ in classtype)))
 359
 360             if self.countries:
 361                 sql = sql.where(t.c.country_code.in_(self.countries.values))
 362
 363             if details.viewbox is not None and details.bounded_viewbox:
 364                 sql = sql.where(t.c.geometry.intersects(VIEWBOX_PARAM))
 365
 366             rows.extend(await conn.execute(sql, bind_params))
 367         else:
 368             # use the class type tables
 369             for category in self.qualifiers.values:
 370                 table = await conn.get_class_table(*category)
 371                 if table is not None:
 372                     sql = _select_placex(t)\
 373                                .join(table, t.c.place_id == table.c.place_id)\
 374                                .where(t.c.class_ == category[0])\
 375                                .where(t.c.type == category[1])
 376
 377                     if details.viewbox is not None and details.bounded_viewbox:
 378                         sql = sql.where(table.c.centroid.intersects(VIEWBOX_PARAM))
 379
 380                     if details.near and details.near_radius is not None:
 381                         sql = sql.order_by(table.c.centroid.ST_Distance(NEAR_PARAM))\
 382                                  .where(table.c.centroid.ST_DWithin(NEAR_PARAM,
 383                                                                     NEAR_RADIUS_PARAM))
 384
 385                     if self.countries:
 386                         sql = sql.where(t.c.country_code.in_(self.countries.values))
 387
 388                     sql = sql.limit(LIMIT_PARAM)
 389                     rows.extend(await conn.execute(sql, bind_params))
 390
 391         results = nres.SearchResults()
 392         for row in rows:
 393             result = nres.create_from_placex_row(row, nres.SearchResult)
 394             assert result
 395             result.accuracy = self.penalty + self.qualifiers.get_penalty((row.class_, row.type))
 396             result.bbox = Bbox.from_wkb(row.bbox)
 397             results.append(result)
 398
 399         return results
 400
 401
 402 class CountrySearch(AbstractSearch):
 403     """ Search for a country name or country code.
 404     """
 405     def __init__(self, sdata: SearchData) -> None:
 406         super().__init__(sdata.penalty)
 407         self.countries = sdata.countries
 408
 409
 410     async def lookup(self, conn: SearchConnection,
 411                      details: SearchDetails) -> nres.SearchResults:
 412         """ Find results for the search in the database.
 413         """
 414         t = conn.t.placex
 415
 416         ccodes = self.countries.values
 417         sql = _select_placex(t)\
 418                 .where(t.c.country_code.in_(ccodes))\
 419                 .where(t.c.rank_address == 4)
 420
 421         if details.geometry_output:
 422             sql = _add_geometry_columns(sql, t.c.geometry, details)
 423
 424         if details.excluded:
 425             sql = sql.where(_exclude_places(t))
 426
 427         if details.viewbox is not None and details.bounded_viewbox:
 428             sql = sql.where(lambda: t.c.geometry.intersects(VIEWBOX_PARAM))
 429
 430         if details.near is not None and details.near_radius is not None:
 431             sql = sql.where(_within_near(t))
 432
 433         results = nres.SearchResults()
 434         for row in await conn.execute(sql, _details_to_bind_params(details)):
 435             result = nres.create_from_placex_row(row, nres.SearchResult)
 436             assert result
 437             result.accuracy = self.penalty + self.countries.get_penalty(row.country_code, 5.0)
 438             result.bbox = Bbox.from_wkb(row.bbox)
 439             results.append(result)
 440
 441         return results or await self.lookup_in_country_table(conn, details)
 442
 443
 444     async def lookup_in_country_table(self, conn: SearchConnection,
 445                                       details: SearchDetails) -> nres.SearchResults:
 446         """ Look up the country in the fallback country tables.
 447         """
 448         # Avoid the fallback search when this is a more search. Country results
 449         # usually are in the first batch of results and it is not possible
 450         # to exclude these fallbacks.
 451         if details.excluded:
 452             return nres.SearchResults()
 453
 454         t = conn.t.country_name
 455         tgrid = conn.t.country_grid
 456
 457         sql = sa.select(tgrid.c.country_code,
 458                         tgrid.c.geometry.ST_Centroid().ST_Collect().ST_Centroid()
 459                               .label('centroid'),
 460                         tgrid.c.geometry.ST_Collect().ST_Expand(0).label('bbox'))\
 461                 .where(tgrid.c.country_code.in_(self.countries.values))\
 462                 .group_by(tgrid.c.country_code)
 463
 464         if details.viewbox is not None and details.bounded_viewbox:
 465             sql = sql.where(tgrid.c.geometry.intersects(VIEWBOX_PARAM))
 466         if details.near is not None and details.near_radius is not None:
 467             sql = sql.where(_within_near(tgrid))
 468
 469         sub = sql.subquery('grid')
 470
 471         sql = sa.select(t.c.country_code,
 472                         (t.c.name
 473                          + sa.func.coalesce(t.c.derived_name,
 474                                             sa.cast('', type_=conn.t.types.Composite))
 475                         ).label('name'),
 476                         sub.c.centroid, sub.c.bbox)\
 477                 .join(sub, t.c.country_code == sub.c.country_code)
 478
 479         if details.geometry_output:
 480             sql = _add_geometry_columns(sql, sub.c.centroid, details)
 481
 482         results = nres.SearchResults()
 483         for row in await conn.execute(sql, _details_to_bind_params(details)):
 484             result = nres.create_from_country_row(row, nres.SearchResult)
 485             assert result
 486             result.bbox = Bbox.from_wkb(row.bbox)
 487             result.accuracy = self.penalty + self.countries.get_penalty(row.country_code, 5.0)
 488             results.append(result)
 489
 490         return results
 491
 492
 493
 494 class PostcodeSearch(AbstractSearch):
 495     """ Search for a postcode.
 496     """
 497     def __init__(self, extra_penalty: float, sdata: SearchData) -> None:
 498         super().__init__(sdata.penalty + extra_penalty)
 499         self.countries = sdata.countries
 500         self.postcodes = sdata.postcodes
 501         self.lookups = sdata.lookups
 502         self.rankings = sdata.rankings
 503
 504
 505     async def lookup(self, conn: SearchConnection,
 506                      details: SearchDetails) -> nres.SearchResults:
 507         """ Find results for the search in the database.
 508         """
 509         t = conn.t.postcode
 510         pcs = self.postcodes.values
 511
 512         sql = sa.select(t.c.place_id, t.c.parent_place_id,
 513                         t.c.rank_search, t.c.rank_address,
 514                         t.c.postcode, t.c.country_code,
 515                         t.c.geometry.label('centroid'))\
 516                 .where(t.c.postcode.in_(pcs))
 517
 518         if details.geometry_output:
 519             sql = _add_geometry_columns(sql, t.c.geometry, details)
 520
 521         penalty: SaExpression = sa.literal(self.penalty)
 522
 523         if details.viewbox is not None:
 524             if details.bounded_viewbox:
 525                 sql = sql.where(t.c.geometry.intersects(VIEWBOX_PARAM))
 526             else:
 527                 penalty += sa.case((t.c.geometry.intersects(VIEWBOX_PARAM), 0.0),
 528                                    (t.c.geometry.intersects(VIEWBOX2_PARAM), 0.5),
 529                                    else_=1.0)
 530
 531         if details.near is not None:
 532             if details.near_radius is not None:
 533                 sql = sql.where(_within_near(t))
 534             sql = sql.order_by(t.c.geometry.ST_Distance(NEAR_PARAM))
 535
 536         if self.countries:
 537             sql = sql.where(t.c.country_code.in_(self.countries.values))
 538
 539         if details.excluded:
 540             sql = sql.where(_exclude_places(t))
 541
 542         if self.lookups:
 543             assert len(self.lookups) == 1
 544             assert self.lookups[0].lookup_type == 'restrict'
 545             tsearch = conn.t.search_name
 546             sql = sql.where(tsearch.c.place_id == t.c.parent_place_id)\
 547                      .where(sa.func.array_cat(tsearch.c.name_vector,
 548                                               tsearch.c.nameaddress_vector,
 549                                               type_=ARRAY(sa.Integer))
 550                                     .contains(self.lookups[0].tokens))
 551
 552         for ranking in self.rankings:
 553             penalty += ranking.sql_penalty(conn.t.search_name)
 554         penalty += sa.case(*((t.c.postcode == v, p) for v, p in self.postcodes),
 555                        else_=1.0)
 556
 557
 558         sql = sql.add_columns(penalty.label('accuracy'))
 559         sql = sql.order_by('accuracy').limit(LIMIT_PARAM)
 560
 561         results = nres.SearchResults()
 562         for row in await conn.execute(sql, _details_to_bind_params(details)):
 563             result = nres.create_from_postcode_row(row, nres.SearchResult)
 564             assert result
 565             result.accuracy = row.accuracy
 566             results.append(result)
 567
 568         return results
 569
 570
 571
 572 class PlaceSearch(AbstractSearch):
 573     """ Generic search for an address or named place.
 574     """
 575     def __init__(self, extra_penalty: float, sdata: SearchData, expected_count: int) -> None:
 576         super().__init__(sdata.penalty + extra_penalty)
 577         self.countries = sdata.countries
 578         self.postcodes = sdata.postcodes
 579         self.housenumbers = sdata.housenumbers
 580         self.qualifiers = sdata.qualifiers
 581         self.lookups = sdata.lookups
 582         self.rankings = sdata.rankings
 583         self.expected_count = expected_count
 584
 585
 586     async def lookup(self, conn: SearchConnection,
 587                      details: SearchDetails) -> nres.SearchResults:
 588         """ Find results for the search in the database.
 589         """
 590         t = conn.t.placex
 591         tsearch = conn.t.search_name
 592
 593         sql: SaLambdaSelect = sa.lambda_stmt(lambda:
 594                   sa.select(t.c.place_id, t.c.osm_type, t.c.osm_id, t.c.name,
 595                             t.c.class_, t.c.type,
 596                             t.c.address, t.c.extratags, t.c.admin_level,
 597                             t.c.housenumber, t.c.postcode, t.c.country_code,
 598                             t.c.wikipedia,
 599                             t.c.parent_place_id, t.c.rank_address, t.c.rank_search,
 600                             t.c.centroid,
 601                             t.c.geometry.ST_Expand(0).label('bbox'))
 602                    .where(t.c.place_id == tsearch.c.place_id))
 603
 604
 605         if details.geometry_output:
 606             sql = _add_geometry_columns(sql, t.c.geometry, details)
 607
 608         penalty: SaExpression = sa.literal(self.penalty)
 609         for ranking in self.rankings:
 610             penalty += ranking.sql_penalty(tsearch)
 611
 612         for lookup in self.lookups:
 613             sql = sql.where(lookup.sql_condition(tsearch))
 614
 615         if self.countries:
 616             sql = sql.where(tsearch.c.country_code.in_(self.countries.values))
 617
 618         if self.postcodes:
 619             # if a postcode is given, don't search for state or country level objects
 620             sql = sql.where(tsearch.c.address_rank > 9)
 621             tpc = conn.t.postcode
 622             pcs = self.postcodes.values
 623             if self.expected_count > 1000:
 624                 # Many results expected. Restrict by postcode.
 625                 sql = sql.where(sa.select(tpc.c.postcode)
 626                                   .where(tpc.c.postcode.in_(pcs))
 627                                   .where(tsearch.c.centroid.ST_DWithin(tpc.c.geometry, 0.12))
 628                                   .exists())
 629
 630             # Less results, only have a preference for close postcodes
 631             pc_near = sa.select(sa.func.min(tpc.c.geometry.ST_Distance(tsearch.c.centroid)))\
 632                       .where(tpc.c.postcode.in_(pcs))\
 633                       .scalar_subquery()
 634             penalty += sa.case((t.c.postcode.in_(pcs), 0.0),
 635                                else_=sa.func.coalesce(pc_near, 2.0))
 636
 637         if details.viewbox is not None:
 638             if details.bounded_viewbox:
 639                 if details.viewbox.area < 0.2:
 640                     sql = sql.where(tsearch.c.centroid.intersects(VIEWBOX_PARAM))
 641                 else:
 642                     sql = sql.where(tsearch.c.centroid.ST_Intersects_no_index(VIEWBOX_PARAM))
 643             elif self.expected_count >= 10000:
 644                 if details.viewbox.area < 0.5:
 645                     sql = sql.where(tsearch.c.centroid.intersects(VIEWBOX2_PARAM))
 646                 else:
 647                     sql = sql.where(tsearch.c.centroid.ST_Intersects_no_index(VIEWBOX2_PARAM))
 648             else:
 649                 penalty += sa.case((t.c.geometry.intersects(VIEWBOX_PARAM), 0.0),
 650                                    (t.c.geometry.intersects(VIEWBOX2_PARAM), 0.5),
 651                                    else_=1.0)
 652
 653         if details.near is not None:
 654             if details.near_radius is not None:
 655                 if details.near_radius < 0.1:
 656                     sql = sql.where(tsearch.c.centroid.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM))
 657                 else:
 658                     sql = sql.where(tsearch.c.centroid.ST_DWithin_no_index(NEAR_PARAM,
 659                                                                            NEAR_RADIUS_PARAM))
 660             sql = sql.add_columns((-tsearch.c.centroid.ST_Distance(NEAR_PARAM))
 661                                       .label('importance'))
 662             sql = sql.order_by(sa.desc(sa.text('importance')))
 663         else:
 664             if self.expected_count < 10000\
 665                or (details.viewbox is not None and details.viewbox.area < 0.5):
 666                 sql = sql.order_by(
 667                         penalty - sa.case((tsearch.c.importance > 0, tsearch.c.importance),
 668                                     else_=0.75001-(sa.cast(tsearch.c.search_rank, sa.Float())/40)))
 669             sql = sql.add_columns(t.c.importance)
 670
 671
 672         sql = sql.add_columns(penalty.label('accuracy'))
 673
 674         if self.expected_count < 10000:
 675             sql = sql.order_by(sa.text('accuracy'))
 676
 677         if self.housenumbers:
 678             hnr_regexp = f"\\m({'|'.join(self.housenumbers.values)})\\M"
 679             sql = sql.where(tsearch.c.address_rank.between(16, 30))\
 680                      .where(sa.or_(tsearch.c.address_rank < 30,
 681                                    t.c.housenumber.op('~*')(hnr_regexp)))
 682
 683             # Cross check for housenumbers, need to do that on a rather large
 684             # set. Worst case there are 40.000 main streets in OSM.
 685             inner = sql.limit(10000).subquery()
 686
 687             # Housenumbers from placex
 688             thnr = conn.t.placex.alias('hnr')
 689             pid_list = array_agg(thnr.c.place_id) # type: ignore[no-untyped-call]
 690             place_sql = sa.select(pid_list)\
 691                           .where(thnr.c.parent_place_id == inner.c.place_id)\
 692                           .where(thnr.c.housenumber.op('~*')(hnr_regexp))\
 693                           .where(thnr.c.linked_place_id == None)\
 694                           .where(thnr.c.indexed_status == 0)
 695
 696             if details.excluded:
 697                 place_sql = place_sql.where(thnr.c.place_id.not_in(sa.bindparam('excluded')))
 698             if self.qualifiers:
 699                 place_sql = place_sql.where(self.qualifiers.sql_restrict(thnr))
 700
 701             numerals = [int(n) for n in self.housenumbers.values
 702                         if n.isdigit() and len(n) < 8]
 703             interpol_sql: SaColumn
 704             tiger_sql: SaColumn
 705             if numerals and \
 706                (not self.qualifiers or ('place', 'house') in self.qualifiers.values):
 707                 # Housenumbers from interpolations
 708                 interpol_sql = _make_interpolation_subquery(conn.t.osmline, inner,
 709                                                             numerals, details)
 710                 # Housenumbers from Tiger
 711                 tiger_sql = sa.case((inner.c.country_code == 'us',
 712                                      _make_interpolation_subquery(conn.t.tiger, inner,
 713                                                                   numerals, details)
 714                                     ), else_=None)
 715             else:
 716                 interpol_sql = sa.null()
 717                 tiger_sql = sa.null()
 718
 719             unsort = sa.select(inner, place_sql.scalar_subquery().label('placex_hnr'),
 720                                interpol_sql.label('interpol_hnr'),
 721                                tiger_sql.label('tiger_hnr')).subquery('unsort')
 722             sql = sa.select(unsort)\
 723                     .order_by(sa.case((unsort.c.placex_hnr != None, 1),
 724                                       (unsort.c.interpol_hnr != None, 2),
 725                                       (unsort.c.tiger_hnr != None, 3),
 726                                       else_=4),
 727                               unsort.c.accuracy)
 728         else:
 729             sql = sql.where(t.c.linked_place_id == None)\
 730                      .where(t.c.indexed_status == 0)
 731             if self.qualifiers:
 732                 sql = sql.where(self.qualifiers.sql_restrict(t))
 733             if details.excluded:
 734                 sql = sql.where(_exclude_places(tsearch))
 735             if details.min_rank > 0:
 736                 sql = sql.where(sa.or_(tsearch.c.address_rank >= MIN_RANK_PARAM,
 737                                        tsearch.c.search_rank >= MIN_RANK_PARAM))
 738             if details.max_rank < 30:
 739                 sql = sql.where(sa.or_(tsearch.c.address_rank <= MAX_RANK_PARAM,
 740                                        tsearch.c.search_rank <= MAX_RANK_PARAM))
 741             if details.layers is not None:
 742                 sql = sql.where(_filter_by_layer(t, details.layers))
 743
 744         sql = sql.limit(LIMIT_PARAM)
 745
 746         results = nres.SearchResults()
 747         for row in await conn.execute(sql, _details_to_bind_params(details)):
 748             result = nres.create_from_placex_row(row, nres.SearchResult)
 749             assert result
 750             result.bbox = Bbox.from_wkb(row.bbox)
 751             result.accuracy = row.accuracy
 752             if not details.excluded or not result.place_id in details.excluded:
 753                 results.append(result)
 754
 755             if self.housenumbers and row.rank_address < 30:
 756                 if row.placex_hnr:
 757                     subs = _get_placex_housenumbers(conn, row.placex_hnr, details)
 758                 elif row.interpol_hnr:
 759                     subs = _get_osmline(conn, row.interpol_hnr, numerals, details)
 760                 elif row.tiger_hnr:
 761                     subs = _get_tiger(conn, row.tiger_hnr, numerals, row.osm_id, details)
 762                 else:
 763                     subs = None
 764
 765                 if subs is not None:
 766                     async for sub in subs:
 767                         assert sub.housenumber
 768                         sub.accuracy = result.accuracy
 769                         if not any(nr in self.housenumbers.values
 770                                    for nr in sub.housenumber.split(';')):
 771                             sub.accuracy += 0.6
 772                         results.append(sub)
 773
 774                 result.accuracy += 1.0 # penalty for missing housenumber
 775
 776         return results