# Copyright (C) 2023 by the Nominatim developer community.
# For a full list of authors see the git log.
"""
-Convertion from token assignment to an abstract DB search.
+Conversion from token assignment to an abstract DB search.
"""
-from typing import Optional, List, Tuple, Iterator
+from typing import Optional, List, Tuple, Iterator, Dict
import heapq
from nominatim.api.types import SearchDetails, DataLayer
from nominatim.api.search.token_assignment import TokenAssignment
import nominatim.api.search.db_search_fields as dbf
import nominatim.api.search.db_searches as dbs
+import nominatim.api.search.db_search_lookups as lookups
def wrap_near_search(categories: List[Tuple[str, str]],
if sdata is None:
return
- categories = self.get_search_categories(assignment)
+ near_items = self.get_near_items(assignment)
+ if near_items is not None and not near_items:
+ return # impossible compbination of near items and category parameter
if assignment.name is None:
- if categories and not sdata.postcodes:
- sdata.qualifiers = categories
- categories = None
+ if near_items and not sdata.postcodes:
+ sdata.qualifiers = near_items
+ near_items = None
builder = self.build_poi_search(sdata)
elif assignment.housenumber:
hnr_tokens = self.query.get_tokens(assignment.housenumber,
builder = self.build_housenumber_search(sdata, hnr_tokens, assignment.address)
else:
builder = self.build_special_search(sdata, assignment.address,
- bool(categories))
+ bool(near_items))
else:
builder = self.build_name_search(sdata, assignment.name, assignment.address,
- bool(categories))
+ bool(near_items))
- if categories:
- penalty = min(categories.penalties)
- categories.penalties = [p - penalty for p in categories.penalties]
+ if near_items:
+ penalty = min(near_items.penalties)
+ near_items.penalties = [p - penalty for p in near_items.penalties]
for search in builder:
- yield dbs.NearSearch(penalty + assignment.penalty, categories, search)
+ search_penalty = search.penalty
+ search.penalty = 0.0
+ yield dbs.NearSearch(penalty + assignment.penalty + search_penalty,
+ near_items, search)
else:
for search in builder:
search.penalty += assignment.penalty
sdata.lookups = [dbf.FieldLookup('nameaddress_vector',
[t.token for r in address
for t in self.query.get_partials_list(r)],
- 'restrict')]
+ lookups.Restrict)]
penalty += 0.2
yield dbs.PostcodeSearch(penalty, sdata)
""" Build a simple address search for special entries where the
housenumber is the main name token.
"""
- sdata.lookups = [dbf.FieldLookup('name_vector', [t.token for t in hnrs], 'lookup_any')]
+ sdata.lookups = [dbf.FieldLookup('name_vector', [t.token for t in hnrs], lookups.LookupAny)]
+ expected_count = sum(t.count for t in hnrs)
- partials = [t for trange in address
- for t in self.query.get_partials_list(trange)]
+ partials = {t.token: t.addr_count for trange in address
+ for t in self.query.get_partials_list(trange)}
- if len(partials) != 1 or partials[0].count < 10000:
+ if expected_count < 8000:
sdata.lookups.append(dbf.FieldLookup('nameaddress_vector',
- [t.token for t in partials], 'lookup_all'))
+ list(partials), lookups.Restrict))
+ elif len(partials) != 1 or list(partials.values())[0] < 10000:
+ sdata.lookups.append(dbf.FieldLookup('nameaddress_vector',
+ list(partials), lookups.LookupAll))
else:
+ addr_fulls = [t.token for t
+ in self.query.get_tokens(address[0], TokenType.WORD)]
+ if len(addr_fulls) > 5:
+ return
sdata.lookups.append(
- dbf.FieldLookup('nameaddress_vector',
- [t.token for t
- in self.query.get_tokens(address[0], TokenType.WORD)],
- 'lookup_any'))
+ dbf.FieldLookup('nameaddress_vector', addr_fulls, lookups.LookupAny))
sdata.housenumbers = dbf.WeightedStrings([], [])
- yield dbs.PlaceSearch(0.05, sdata, sum(t.count for t in hnrs))
+ yield dbs.PlaceSearch(0.05, sdata, expected_count)
def build_name_search(self, sdata: dbf.SearchData,
are and tries to find a lookup that optimizes index use.
"""
penalty = 0.0 # extra penalty
- name_partials = self.query.get_partials_list(name)
- name_tokens = [t.token for t in name_partials]
+ name_partials = {t.token: t for t in self.query.get_partials_list(name)}
addr_partials = [t for r in address for t in self.query.get_partials_list(r)]
- addr_tokens = [t.token for t in addr_partials]
+ addr_tokens = list({t.token for t in addr_partials})
- partials_indexed = all(t.is_indexed for t in name_partials) \
+ partials_indexed = all(t.is_indexed for t in name_partials.values()) \
and all(t.is_indexed for t in addr_partials)
- exp_count = min(t.count for t in name_partials)
+ exp_count = min(t.count for t in name_partials.values()) / (2**(len(name_partials) - 1))
- if (len(name_partials) > 3 or exp_count < 1000) and partials_indexed:
- yield penalty, exp_count, dbf.lookup_by_names(name_tokens, addr_tokens)
+ if (len(name_partials) > 3 or exp_count < 8000) and partials_indexed:
+ yield penalty, exp_count, dbf.lookup_by_names(list(name_partials.keys()), addr_tokens)
return
- exp_count = exp_count / (2**len(addr_partials)) if addr_partials else exp_count
-
+ addr_count = min(t.addr_count for t in addr_partials) if addr_partials else 30000
# Partial term to frequent. Try looking up by rare full names first.
name_fulls = self.query.get_tokens(name, TokenType.WORD)
- rare_names = list(filter(lambda t: t.count < 10000, name_fulls))
- # At this point drop unindexed partials from the address.
- # This might yield wrong results, nothing we can do about that.
- if not partials_indexed:
- addr_tokens = [t.token for t in addr_partials if t.is_indexed]
- penalty += 1.2 * sum(t.penalty for t in addr_partials if not t.is_indexed)
- if rare_names:
- # Any of the full names applies with all of the partials from the address
- yield penalty, sum(t.count for t in rare_names),\
- dbf.lookup_by_any_name([t.token for t in rare_names], addr_tokens)
+ if name_fulls:
+ fulls_count = sum(t.count for t in name_fulls)
+ if partials_indexed:
+ penalty += 1.2 * sum(t.penalty for t in addr_partials if not t.is_indexed)
+
+ if fulls_count < 50000 or addr_count < 30000:
+ yield penalty,fulls_count / (2**len(addr_tokens)), \
+ self.get_full_name_ranking(name_fulls, addr_partials,
+ fulls_count > 30000 / max(1, len(addr_tokens)))
# To catch remaining results, lookup by name and address
# We only do this if there is a reasonable number of results expected.
- if exp_count < 10000:
- if all(t.is_indexed for t in name_partials):
- lookup = [dbf.FieldLookup('name_vector', name_tokens, 'lookup_all')]
- else:
- # we don't have the partials, try with the non-rare names
- non_rare_names = [t.token for t in name_fulls if t.count >= 10000]
- if not non_rare_names:
- return
- lookup = [dbf.FieldLookup('name_vector', non_rare_names, 'lookup_any')]
- if addr_tokens:
- lookup.append(dbf.FieldLookup('nameaddress_vector', addr_tokens, 'lookup_all'))
- penalty += 0.1 * max(0, 5 - len(name_partials) - len(addr_tokens))
- if len(rare_names) == len(name_fulls):
- # if there already was a search for all full tokens,
- # avoid this if anything has been found
- penalty += 0.25
- yield penalty, exp_count, lookup
-
-
- def get_name_ranking(self, trange: TokenRange) -> dbf.FieldRanking:
+ exp_count = exp_count / (2**len(addr_tokens)) if addr_tokens else exp_count
+ if exp_count < 10000 and addr_count < 20000\
+ and all(t.is_indexed for t in name_partials.values()):
+ penalty += 0.35 * max(1 if name_fulls else 0.1,
+ 5 - len(name_partials) - len(addr_tokens))
+ yield penalty, exp_count,\
+ self.get_name_address_ranking(list(name_partials.keys()), addr_partials)
+
+
+ def get_name_address_ranking(self, name_tokens: List[int],
+ addr_partials: List[Token]) -> List[dbf.FieldLookup]:
+ """ Create a ranking expression looking up by name and address.
+ """
+ lookup = [dbf.FieldLookup('name_vector', name_tokens, lookups.LookupAll)]
+
+ addr_restrict_tokens = []
+ addr_lookup_tokens = []
+ for t in addr_partials:
+ if t.is_indexed:
+ if t.addr_count > 20000:
+ addr_restrict_tokens.append(t.token)
+ else:
+ addr_lookup_tokens.append(t.token)
+
+ if addr_restrict_tokens:
+ lookup.append(dbf.FieldLookup('nameaddress_vector',
+ addr_restrict_tokens, lookups.Restrict))
+ if addr_lookup_tokens:
+ lookup.append(dbf.FieldLookup('nameaddress_vector',
+ addr_lookup_tokens, lookups.LookupAll))
+
+ return lookup
+
+
+ def get_full_name_ranking(self, name_fulls: List[Token], addr_partials: List[Token],
+ use_lookup: bool) -> List[dbf.FieldLookup]:
+ """ Create a ranking expression with full name terms and
+ additional address lookup. When 'use_lookup' is true, then
+ address lookups will use the index, when the occurences are not
+ too many.
+ """
+ # At this point drop unindexed partials from the address.
+ # This might yield wrong results, nothing we can do about that.
+ if use_lookup:
+ addr_restrict_tokens = []
+ addr_lookup_tokens = []
+ for t in addr_partials:
+ if t.is_indexed:
+ if t.addr_count > 20000:
+ addr_restrict_tokens.append(t.token)
+ else:
+ addr_lookup_tokens.append(t.token)
+ else:
+ addr_restrict_tokens = [t.token for t in addr_partials if t.is_indexed]
+ addr_lookup_tokens = []
+
+ return dbf.lookup_by_any_name([t.token for t in name_fulls],
+ addr_restrict_tokens, addr_lookup_tokens)
+
+
+ def get_name_ranking(self, trange: TokenRange,
+ db_field: str = 'name_vector') -> dbf.FieldRanking:
""" Create a ranking expression for a name term in the given range.
"""
name_fulls = self.query.get_tokens(trange, TokenType.WORD)
# Fallback, sum of penalty for partials
name_partials = self.query.get_partials_list(trange)
default = sum(t.penalty for t in name_partials) + 0.2
- return dbf.FieldRanking('name_vector', default, ranks)
+ return dbf.FieldRanking(db_field, default, ranks)
def get_addr_ranking(self, trange: TokenRange) -> dbf.FieldRanking:
sdata = dbf.SearchData()
sdata.penalty = assignment.penalty
if assignment.country:
- tokens = self.query.get_tokens(assignment.country, TokenType.COUNTRY)
- if self.details.countries:
- tokens = [t for t in tokens if t.lookup_word in self.details.countries]
- if not tokens:
- return None
+ tokens = self.get_country_tokens(assignment.country)
+ if not tokens:
+ return None
sdata.set_strings('countries', tokens)
elif self.details.countries:
sdata.countries = dbf.WeightedStrings(self.details.countries,
self.query.get_tokens(assignment.postcode,
TokenType.POSTCODE))
if assignment.qualifier:
- sdata.set_qualifiers(self.query.get_tokens(assignment.qualifier,
- TokenType.QUALIFIER))
+ tokens = self.get_qualifier_tokens(assignment.qualifier)
+ if not tokens:
+ return None
+ sdata.set_qualifiers(tokens)
+ elif self.details.categories:
+ sdata.qualifiers = dbf.WeightedCategories(self.details.categories,
+ [0.0] * len(self.details.categories))
if assignment.address:
- sdata.set_ranking([self.get_addr_ranking(r) for r in assignment.address])
+ if not assignment.name and assignment.housenumber:
+ # housenumber search: the first item needs to be handled like
+ # a name in ranking or penalties are not comparable with
+ # normal searches.
+ sdata.set_ranking([self.get_name_ranking(assignment.address[0],
+ db_field='nameaddress_vector')]
+ + [self.get_addr_ranking(r) for r in assignment.address[1:]])
+ else:
+ sdata.set_ranking([self.get_addr_ranking(r) for r in assignment.address])
else:
sdata.rankings = []
return sdata
- def get_search_categories(self,
- assignment: TokenAssignment) -> Optional[dbf.WeightedCategories]:
- """ Collect tokens for category search or use the categories
- requested per parameter.
- Returns None if no category search is requested.
+ def get_country_tokens(self, trange: TokenRange) -> List[Token]:
+ """ Return the list of country tokens for the given range,
+ optionally filtered by the country list from the details
+ parameters.
"""
- if assignment.category:
- tokens = [t for t in self.query.get_tokens(assignment.category,
- TokenType.CATEGORY)
- if not self.details.categories
- or t.get_category() in self.details.categories]
- return dbf.WeightedCategories([t.get_category() for t in tokens],
- [t.penalty for t in tokens])
+ tokens = self.query.get_tokens(trange, TokenType.COUNTRY)
+ if self.details.countries:
+ tokens = [t for t in tokens if t.lookup_word in self.details.countries]
+ return tokens
+
+
+ def get_qualifier_tokens(self, trange: TokenRange) -> List[Token]:
+ """ Return the list of qualifier tokens for the given range,
+ optionally filtered by the qualifier list from the details
+ parameters.
+ """
+ tokens = self.query.get_tokens(trange, TokenType.QUALIFIER)
if self.details.categories:
- return dbf.WeightedCategories(self.details.categories,
- [0.0] * len(self.details.categories))
+ tokens = [t for t in tokens if t.get_category() in self.details.categories]
+
+ return tokens
+
+
+ def get_near_items(self, assignment: TokenAssignment) -> Optional[dbf.WeightedCategories]:
+ """ Collect tokens for near items search or use the categories
+ requested per parameter.
+ Returns None if no category search is requested.
+ """
+ if assignment.near_item:
+ tokens: Dict[Tuple[str, str], float] = {}
+ for t in self.query.get_tokens(assignment.near_item, TokenType.NEAR_ITEM):
+ cat = t.get_category()
+ # The category of a near search will be that of near_item.
+ # Thus, if search is restricted to a category parameter,
+ # the two sets must intersect.
+ if (not self.details.categories or cat in self.details.categories)\
+ and t.penalty < tokens.get(cat, 1000.0):
+ tokens[cat] = t.penalty
+ return dbf.WeightedCategories(list(tokens.keys()), list(tokens.values()))
return None
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