Merge pull request #3422 from lonvia/drop-non-parented-interpolations

[nominatim.git] / nominatim / tokenizer / icu_tokenizer.py

diff --git a/nominatim/tokenizer/icu_tokenizer.py b/nominatim/tokenizer/icu_tokenizer.py
index 2ece10f2ccd28aecb3a181ceafabeb86c9f289a7..4b9dac69e18eb63760c07ff71a981f1343ab6ac3 100644 (file)
--- a/nominatim/tokenizer/icu_tokenizer.py
+++ b/nominatim/tokenizer/icu_tokenizer.py
@@ -1,46 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2022 by the Nominatim developer community.
+# For a full list of authors see the git log.

 """
 Tokenizer implementing normalisation as used before Nominatim 4 but using
 libICU instead of the PostgreSQL module.
 """
 """
 Tokenizer implementing normalisation as used before Nominatim 4 but using
 libICU instead of the PostgreSQL module.
 """

-from collections import Counter
+from typing import Optional, Sequence, List, Tuple, Mapping, Any, cast, \
+                   Dict, Set, Iterable

 import itertools
 import json
 import logging
 import itertools
 import json
 import logging

-import re
+from pathlib import Path

 from textwrap import dedent
 
 from textwrap import dedent
 

-from nominatim.db.connection import connect
-from nominatim.db.properties import set_property, get_property
+from nominatim.db.connection import connect, Connection, Cursor
+from nominatim.config import Configuration

 from nominatim.db.utils import CopyBuffer
 from nominatim.db.sql_preprocessor import SQLPreprocessor
 from nominatim.db.utils import CopyBuffer
 from nominatim.db.sql_preprocessor import SQLPreprocessor

-from nominatim.indexer.place_info import PlaceInfo
+from nominatim.data.place_info import PlaceInfo

 from nominatim.tokenizer.icu_rule_loader import ICURuleLoader
 from nominatim.tokenizer.icu_rule_loader import ICURuleLoader

+from nominatim.tokenizer.place_sanitizer import PlaceSanitizer
+from nominatim.data.place_name import PlaceName
+from nominatim.tokenizer.icu_token_analysis import ICUTokenAnalysis

 from nominatim.tokenizer.base import AbstractAnalyzer, AbstractTokenizer
 
 DBCFG_TERM_NORMALIZATION = "tokenizer_term_normalization"
 
 LOG = logging.getLogger()
 
 from nominatim.tokenizer.base import AbstractAnalyzer, AbstractTokenizer
 
 DBCFG_TERM_NORMALIZATION = "tokenizer_term_normalization"
 
 LOG = logging.getLogger()
 

-def create(dsn, data_dir):
+WORD_TYPES =(('country_names', 'C'),
+             ('postcodes', 'P'),
+             ('full_word', 'W'),
+             ('housenumbers', 'H'))
+
+def create(dsn: str, data_dir: Path) -> 'ICUTokenizer':

     """ Create a new instance of the tokenizer provided by this module.
     """
     """ Create a new instance of the tokenizer provided by this module.
     """

-    return LegacyICUTokenizer(dsn, data_dir)
+    return ICUTokenizer(dsn, data_dir)

 
 
 
 

-class LegacyICUTokenizer(AbstractTokenizer):
-    """ This tokenizer uses libICU to covert names and queries to ASCII.
+class ICUTokenizer(AbstractTokenizer):
+    """ This tokenizer uses libICU to convert names and queries to ASCII.

         Otherwise it uses the same algorithms and data structures as the
         normalization routines in Nominatim 3.
     """
 
         Otherwise it uses the same algorithms and data structures as the
         normalization routines in Nominatim 3.
     """
 

-    def __init__(self, dsn, data_dir):
+    def __init__(self, dsn: str, data_dir: Path) -> None:

         self.dsn = dsn
         self.data_dir = data_dir
         self.dsn = dsn
         self.data_dir = data_dir

-        self.loader = None
-        self.term_normalization = None
+        self.loader: Optional[ICURuleLoader] = None

 
 
 
 

-    def init_new_db(self, config, init_db=True):
+    def init_new_db(self, config: Configuration, init_db: bool = True) -> None:

         """ Set up a new tokenizer for the database.
 
             This copies all necessary data in the project directory to make
         """ Set up a new tokenizer for the database.
 
             This copies all necessary data in the project directory to make


@@ -48,33 +62,34 @@ class LegacyICUTokenizer(AbstractTokenizer):
         """
         self.loader = ICURuleLoader(config)
 
         """
         self.loader = ICURuleLoader(config)
 

-        self.term_normalization = config.TERM_NORMALIZATION
-
-        self._install_php(config.lib_dir.php)
+        self._install_php(config.lib_dir.php, overwrite=True)

         self._save_config()
 
         if init_db:
             self.update_sql_functions(config)
         self._save_config()
 
         if init_db:
             self.update_sql_functions(config)

-            self._init_db_tables(config)
+            self._setup_db_tables(config)
+            self._create_base_indices(config, 'word')

 
 
 
 

-    def init_from_project(self, config):
+    def init_from_project(self, config: Configuration) -> None:

         """ Initialise the tokenizer from the project directory.
         """
         self.loader = ICURuleLoader(config)
 
         with connect(self.dsn) as conn:
             self.loader.load_config_from_db(conn)
         """ Initialise the tokenizer from the project directory.
         """
         self.loader = ICURuleLoader(config)
 
         with connect(self.dsn) as conn:
             self.loader.load_config_from_db(conn)

-            self.term_normalization = get_property(conn, DBCFG_TERM_NORMALIZATION)

 
 

+        self._install_php(config.lib_dir.php, overwrite=False)

 
 

-    def finalize_import(self, _):
+
+    def finalize_import(self, config: Configuration) -> None:

         """ Do any required postprocessing to make the tokenizer data ready
             for use.
         """
         """ Do any required postprocessing to make the tokenizer data ready
             for use.
         """

+        self._create_lookup_indices(config, 'word')

 
 
 
 

-    def update_sql_functions(self, config):
+    def update_sql_functions(self, config: Configuration) -> None:

         """ Reimport the SQL functions for this tokenizer.
         """
         with connect(self.dsn) as conn:
         """ Reimport the SQL functions for this tokenizer.
         """
         with connect(self.dsn) as conn:


@@ -82,18 +97,159 @@ class LegacyICUTokenizer(AbstractTokenizer):
             sqlp.run_sql_file(conn, 'tokenizer/icu_tokenizer.sql')
 
 
             sqlp.run_sql_file(conn, 'tokenizer/icu_tokenizer.sql')
 
 

-    def check_database(self, config):
+    def check_database(self, config: Configuration) -> None:

         """ Check that the tokenizer is set up correctly.
         """
         """ Check that the tokenizer is set up correctly.
         """

+        # Will throw an error if there is an issue.

         self.init_from_project(config)
 
         self.init_from_project(config)
 

-        if self.term_normalization is None:
-            return "Configuration for tokenizer 'icu' are missing."

 
 

-        return None
+    def update_statistics(self, config: Configuration, threads: int = 2) -> None:
+        """ Recompute frequencies for all name words.
+        """
+        with connect(self.dsn) as conn:
+            if not conn.table_exists('search_name'):
+                return
+
+            with conn.cursor() as cur:
+                cur.execute('ANALYSE search_name')
+                if threads > 1:
+                    cur.execute('SET max_parallel_workers_per_gather TO %s',
+                                (min(threads, 6),))
+
+                if conn.server_version_tuple() < (12, 0):
+                    LOG.info('Computing word frequencies')
+                    cur.drop_table('word_frequencies')
+                    cur.drop_table('addressword_frequencies')
+                    cur.execute("""CREATE TEMP TABLE word_frequencies AS
+                                     SELECT unnest(name_vector) as id, count(*)
+                                     FROM search_name GROUP BY id""")
+                    cur.execute('CREATE INDEX ON word_frequencies(id)')
+                    cur.execute("""CREATE TEMP TABLE addressword_frequencies AS
+                                     SELECT unnest(nameaddress_vector) as id, count(*)
+                                     FROM search_name GROUP BY id""")
+                    cur.execute('CREATE INDEX ON addressword_frequencies(id)')
+                    cur.execute("""CREATE OR REPLACE FUNCTION word_freq_update(wid INTEGER,
+                                                                               INOUT info JSONB)
+                                   AS $$
+                                   DECLARE rec RECORD;
+                                   BEGIN
+                                   IF info is null THEN
+                                     info = '{}'::jsonb;
+                                   END IF;
+                                   FOR rec IN SELECT count FROM word_frequencies WHERE id = wid
+                                   LOOP
+                                     info = info || jsonb_build_object('count', rec.count);
+                                   END LOOP;
+                                   FOR rec IN SELECT count FROM addressword_frequencies WHERE id = wid
+                                   LOOP
+                                     info = info || jsonb_build_object('addr_count', rec.count);
+                                   END LOOP;
+                                   IF info = '{}'::jsonb THEN
+                                     info = null;
+                                   END IF;
+                                   END;
+                                   $$ LANGUAGE plpgsql IMMUTABLE;
+                                """)
+                    LOG.info('Update word table with recomputed frequencies')
+                    cur.drop_table('tmp_word')
+                    cur.execute("""CREATE TABLE tmp_word AS
+                                    SELECT word_id, word_token, type, word,
+                                           word_freq_update(word_id, info) as info
+                                    FROM word
+                                """)
+                    cur.drop_table('word_frequencies')
+                    cur.drop_table('addressword_frequencies')
+                else:
+                    LOG.info('Computing word frequencies')
+                    cur.drop_table('word_frequencies')
+                    cur.execute("""
+                      CREATE TEMP TABLE word_frequencies AS
+                      WITH word_freq AS MATERIALIZED (
+                               SELECT unnest(name_vector) as id, count(*)
+                                     FROM search_name GROUP BY id),
+                           addr_freq AS MATERIALIZED (
+                               SELECT unnest(nameaddress_vector) as id, count(*)
+                                     FROM search_name GROUP BY id)
+                      SELECT coalesce(a.id, w.id) as id,
+                             (CASE WHEN w.count is null THEN '{}'::JSONB
+                                  ELSE jsonb_build_object('count', w.count) END
+                              ||
+                              CASE WHEN a.count is null THEN '{}'::JSONB
+                                  ELSE jsonb_build_object('addr_count', a.count) END) as info
+                      FROM word_freq w FULL JOIN addr_freq a ON a.id = w.id;
+                      """)
+                    cur.execute('CREATE UNIQUE INDEX ON word_frequencies(id) INCLUDE(info)')
+                    cur.execute('ANALYSE word_frequencies')
+                    LOG.info('Update word table with recomputed frequencies')
+                    cur.drop_table('tmp_word')
+                    cur.execute("""CREATE TABLE tmp_word AS
+                                    SELECT word_id, word_token, type, word,
+                                           (CASE WHEN wf.info is null THEN word.info
+                                            ELSE coalesce(word.info, '{}'::jsonb) || wf.info
+                                            END) as info
+                                    FROM word LEFT JOIN word_frequencies wf
+                                         ON word.word_id = wf.id
+                                """)
+                    cur.drop_table('word_frequencies')
+
+            with conn.cursor() as cur:
+                cur.execute('SET max_parallel_workers_per_gather TO 0')
+
+            sqlp = SQLPreprocessor(conn, config)
+            sqlp.run_string(conn,
+                            'GRANT SELECT ON tmp_word TO "{{config.DATABASE_WEBUSER}}"')
+            conn.commit()
+        self._create_base_indices(config, 'tmp_word')
+        self._create_lookup_indices(config, 'tmp_word')
+        self._move_temporary_word_table('tmp_word')
+

 
 
 
 

-    def name_analyzer(self):
+    def _cleanup_housenumbers(self) -> None:
+        """ Remove unused house numbers.
+        """
+        with connect(self.dsn) as conn:
+            if not conn.table_exists('search_name'):
+                return
+            with conn.cursor(name="hnr_counter") as cur:
+                cur.execute("""SELECT DISTINCT word_id, coalesce(info->>'lookup', word_token)
+                               FROM word
+                               WHERE type = 'H'
+                                 AND NOT EXISTS(SELECT * FROM search_name
+                                                WHERE ARRAY[word.word_id] && name_vector)
+                                 AND (char_length(coalesce(word, word_token)) > 6
+                                      OR coalesce(word, word_token) not similar to '\\d+')
+                            """)
+                candidates = {token: wid for wid, token in cur}
+            with conn.cursor(name="hnr_counter") as cur:
+                cur.execute("""SELECT housenumber FROM placex
+                               WHERE housenumber is not null
+                                     AND (char_length(housenumber) > 6
+                                          OR housenumber not similar to '\\d+')
+                            """)
+                for row in cur:
+                    for hnr in row[0].split(';'):
+                        candidates.pop(hnr, None)
+            LOG.info("There are %s outdated housenumbers.", len(candidates))
+            LOG.debug("Outdated housenumbers: %s", candidates.keys())
+            if candidates:
+                with conn.cursor() as cur:
+                    cur.execute("""DELETE FROM word WHERE word_id = any(%s)""",
+                                (list(candidates.values()), ))
+                conn.commit()
+
+
+
+    def update_word_tokens(self) -> None:
+        """ Remove unused tokens.
+        """
+        LOG.warning("Cleaning up housenumber tokens.")
+        self._cleanup_housenumbers()
+        LOG.warning("Tokenizer house-keeping done.")
+
+
+    def name_analyzer(self) -> 'ICUNameAnalyzer':

         """ Create a new analyzer for tokenizing names and queries
             using this tokinzer. Analyzers are context managers and should
             be used accordingly:
         """ Create a new analyzer for tokenizing names and queries
             using this tokinzer. Analyzers are context managers and should
             be used accordingly:


@@ -108,89 +264,136 @@ class LegacyICUTokenizer(AbstractTokenizer):
 
             Analyzers are not thread-safe. You need to instantiate one per thread.
         """
 
             Analyzers are not thread-safe. You need to instantiate one per thread.
         """

-        return LegacyICUNameAnalyzer(self.dsn, self.loader.make_sanitizer(),
-                                     self.loader.make_token_analysis())
+        assert self.loader is not None
+        return ICUNameAnalyzer(self.dsn, self.loader.make_sanitizer(),
+                               self.loader.make_token_analysis())
+
+
+    def most_frequent_words(self, conn: Connection, num: int) -> List[str]:
+        """ Return a list of the `num` most frequent full words
+            in the database.
+        """
+        with conn.cursor() as cur:
+            cur.execute("""SELECT word, sum((info->>'count')::int) as count
+                             FROM word WHERE type = 'W'
+                             GROUP BY word
+                             ORDER BY count DESC LIMIT %s""", (num,))
+            return list(s[0].split('@')[0] for s in cur)

 
 
 
 

-    def _install_php(self, phpdir):
+    def _install_php(self, phpdir: Optional[Path], overwrite: bool = True) -> None:

         """ Install the php script for the tokenizer.
         """
         """ Install the php script for the tokenizer.
         """

-        php_file = self.data_dir / "tokenizer.php"
-        php_file.write_text(dedent(f"""\
-            <?php
-            @define('CONST_Max_Word_Frequency', 10000000);
-            @define('CONST_Term_Normalization_Rules', "{self.term_normalization}");
-            @define('CONST_Transliteration', "{self.loader.get_search_rules()}");
-            require_once('{phpdir}/tokenizer/icu_tokenizer.php');"""))
+        if phpdir is not None:
+            assert self.loader is not None
+            php_file = self.data_dir / "tokenizer.php"

 
 

+            if not php_file.exists() or overwrite:
+                php_file.write_text(dedent(f"""\
+                    <?php
+                    @define('CONST_Max_Word_Frequency', 10000000);
+                    @define('CONST_Term_Normalization_Rules', "{self.loader.normalization_rules}");
+                    @define('CONST_Transliteration', "{self.loader.get_search_rules()}");
+                    require_once('{phpdir}/tokenizer/icu_tokenizer.php');"""), encoding='utf-8')

 
 

-    def _save_config(self):
+
+    def _save_config(self) -> None:

         """ Save the configuration that needs to remain stable for the given
             database as database properties.
         """
         """ Save the configuration that needs to remain stable for the given
             database as database properties.
         """

+        assert self.loader is not None

         with connect(self.dsn) as conn:
             self.loader.save_config_to_db(conn)
         with connect(self.dsn) as conn:
             self.loader.save_config_to_db(conn)

-            set_property(conn, DBCFG_TERM_NORMALIZATION, self.term_normalization)

 
 
 
 

-    def _init_db_tables(self, config):
+    def _setup_db_tables(self, config: Configuration) -> None:

         """ Set up the word table and fill it with pre-computed word
             frequencies.
         """
         with connect(self.dsn) as conn:
         """ Set up the word table and fill it with pre-computed word
             frequencies.
         """
         with connect(self.dsn) as conn:

+            with conn.cursor() as cur:
+                cur.drop_table('word')

             sqlp = SQLPreprocessor(conn, config)
             sqlp = SQLPreprocessor(conn, config)

-            sqlp.run_sql_file(conn, 'tokenizer/icu_tokenizer_tables.sql')
+            sqlp.run_string(conn, """
+                CREATE TABLE word (
+                      word_id INTEGER,
+                      word_token text NOT NULL,
+                      type text NOT NULL,
+                      word text,
+                      info jsonb
+                    ) {{db.tablespace.search_data}};
+                GRANT SELECT ON word TO "{{config.DATABASE_WEBUSER}}";
+
+                DROP SEQUENCE IF EXISTS seq_word;
+                CREATE SEQUENCE seq_word start 1;
+                GRANT SELECT ON seq_word to "{{config.DATABASE_WEBUSER}}";
+            """)

             conn.commit()
 
             conn.commit()
 

-            LOG.warning("Precomputing word tokens")
-
-            # get partial words and their frequencies
-            words = self._count_partial_terms(conn)

 
 

-            # copy them back into the word table
-            with CopyBuffer() as copystr:
-                for term, cnt in words.items():
-                    copystr.add('w', term, json.dumps({'count': cnt}))
+    def _create_base_indices(self, config: Configuration, table_name: str) -> None:
+        """ Set up the word table and fill it with pre-computed word
+            frequencies.
+        """
+        with connect(self.dsn) as conn:
+            sqlp = SQLPreprocessor(conn, config)
+            sqlp.run_string(conn,
+                            """CREATE INDEX idx_{{table_name}}_word_token ON {{table_name}}
+                               USING BTREE (word_token) {{db.tablespace.search_index}}""",
+                            table_name=table_name)
+            for name, ctype in WORD_TYPES:
+                sqlp.run_string(conn,
+                                """CREATE INDEX idx_{{table_name}}_{{idx_name}} ON {{table_name}}
+                                   USING BTREE (word) {{db.tablespace.address_index}}
+                                   WHERE type = '{{column_type}}'
+                                """,
+                                table_name=table_name, idx_name=name,
+                                column_type=ctype)
+            conn.commit()

 
 

-                with conn.cursor() as cur:
-                    copystr.copy_out(cur, 'word',
-                                     columns=['type', 'word_token', 'info'])
-                    cur.execute("""UPDATE word SET word_id = nextval('seq_word')
-                                   WHERE word_id is null and type = 'w'""")

 
 

+    def _create_lookup_indices(self, config: Configuration, table_name: str) -> None:
+        """ Create additional indexes used when running the API.
+        """
+        with connect(self.dsn) as conn:
+            sqlp = SQLPreprocessor(conn, config)
+            # Index required for details lookup.
+            sqlp.run_string(conn, """
+                CREATE INDEX IF NOT EXISTS idx_{{table_name}}_word_id
+                  ON {{table_name}} USING BTREE (word_id) {{db.tablespace.search_index}}
+            """,
+            table_name=table_name)

             conn.commit()
 
             conn.commit()
 

-    def _count_partial_terms(self, conn):
-        """ Count the partial terms from the names in the place table.
-        """
-        words = Counter()
-        name_proc = self.loader.make_token_analysis()

 
 

-        with conn.cursor(name="words") as cur:
-            cur.execute(""" SELECT v, count(*) FROM
-                              (SELECT svals(name) as v FROM place)x
-                            WHERE length(v) < 75 GROUP BY v""")
+    def _move_temporary_word_table(self, old: str) -> None:
+        """ Rename all tables and indexes used by the tokenizer.
+        """
+        with connect(self.dsn) as conn:
+            with conn.cursor() as cur:
+                cur.drop_table('word')
+                cur.execute(f"ALTER TABLE {old} RENAME TO word")
+                for idx in ('word_token', 'word_id'):
+                    cur.execute(f"""ALTER INDEX idx_{old}_{idx}
+                                      RENAME TO idx_word_{idx}""")
+                for name, _ in WORD_TYPES:
+                    cur.execute(f"""ALTER INDEX idx_{old}_{name}
+                                    RENAME TO idx_word_{name}""")
+            conn.commit()

 
 

-            for name, cnt in cur:
-                terms = set()
-                for word in name_proc.get_variants_ascii(name_proc.get_normalized(name)):
-                    if ' ' in word:
-                        terms.update(word.split())
-                for term in terms:
-                    words[term] += cnt

 
 

-        return words

 
 
 
 

-class LegacyICUNameAnalyzer(AbstractAnalyzer):
-    """ The legacy analyzer uses the ICU library for splitting names.
+class ICUNameAnalyzer(AbstractAnalyzer):
+    """ The ICU analyzer uses the ICU library for splitting names.

 
         Each instance opens a connection to the database to request the
         normalization.
     """
 
 
         Each instance opens a connection to the database to request the
         normalization.
     """
 

-    def __init__(self, dsn, sanitizer, token_analysis):
-        self.conn = connect(dsn).connection
+    def __init__(self, dsn: str, sanitizer: PlaceSanitizer,
+                 token_analysis: ICUTokenAnalysis) -> None:
+        self.conn: Optional[Connection] = connect(dsn).connection

         self.conn.autocommit = True
         self.sanitizer = sanitizer
         self.token_analysis = token_analysis
         self.conn.autocommit = True
         self.sanitizer = sanitizer
         self.token_analysis = token_analysis


@@ -198,7 +401,7 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         self._cache = _TokenCache()
 
 
         self._cache = _TokenCache()
 
 

-    def close(self):
+    def close(self) -> None:

         """ Free all resources used by the analyzer.
         """
         if self.conn:
         """ Free all resources used by the analyzer.
         """
         if self.conn:


@@ -206,20 +409,20 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
             self.conn = None
 
 
             self.conn = None
 
 

-    def _search_normalized(self, name):
+    def _search_normalized(self, name: str) -> str:

         """ Return the search token transliteration of the given name.
         """
         """ Return the search token transliteration of the given name.
         """

-        return self.token_analysis.get_search_normalized(name)
+        return cast(str, self.token_analysis.search.transliterate(name)).strip()

 
 
 
 

-    def _normalized(self, name):
+    def _normalized(self, name: str) -> str:

         """ Return the normalized version of the given name with all
             non-relevant information removed.
         """
         """ Return the normalized version of the given name with all
             non-relevant information removed.
         """

-        return self.token_analysis.get_normalized(name)
+        return cast(str, self.token_analysis.normalizer.transliterate(name)).strip()

 
 
 
 

-    def get_word_token_info(self, words):
+    def get_word_token_info(self, words: Sequence[str]) -> List[Tuple[str, str, int]]:

         """ Return token information for the given list of words.
             If a word starts with # it is assumed to be a full name
             otherwise is a partial name.
         """ Return token information for the given list of words.
             If a word starts with # it is assumed to be a full name
             otherwise is a partial name.


@@ -230,6 +433,7 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
             The function is used for testing and debugging only
             and not necessarily efficient.
         """
             The function is used for testing and debugging only
             and not necessarily efficient.
         """

+        assert self.conn is not None

         full_tokens = {}
         partial_tokens = {}
         for word in words:
         full_tokens = {}
         partial_tokens = {}
         for word in words:


@@ -252,8 +456,7 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
                + [(k, v, part_ids.get(v, None)) for k, v in partial_tokens.items()]
 
 
                + [(k, v, part_ids.get(v, None)) for k, v in partial_tokens.items()]
 
 

-    @staticmethod
-    def normalize_postcode(postcode):
+    def normalize_postcode(self, postcode: str) -> str:

         """ Convert the postcode to a standardized form.
 
             This function must yield exactly the same result as the SQL function
         """ Convert the postcode to a standardized form.
 
             This function must yield exactly the same result as the SQL function


@@ -262,52 +465,91 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         return postcode.strip().upper()
 
 
         return postcode.strip().upper()
 
 

-    def _make_standard_hnr(self, hnr):
-        """ Create a normalised version of a housenumber.
-
-            This function takes minor shortcuts on transliteration.
-        """
-        return self._search_normalized(hnr)
-
-    def update_postcodes_from_db(self):
+    def update_postcodes_from_db(self) -> None:

         """ Update postcode tokens in the word table from the location_postcode
             table.
         """
         """ Update postcode tokens in the word table from the location_postcode
             table.
         """

-        to_delete = []
+        assert self.conn is not None
+        analyzer = self.token_analysis.analysis.get('@postcode')
+

         with self.conn.cursor() as cur:
         with self.conn.cursor() as cur:

-            # This finds us the rows in location_postcode and word that are
-            # missing in the other table.
-            cur.execute("""SELECT * FROM
-                            (SELECT pc, word FROM
-                              (SELECT distinct(postcode) as pc FROM location_postcode) p
-                              FULL JOIN
-                              (SELECT word FROM word WHERE type = 'P') w
-                              ON pc = word) x
-                           WHERE pc is null or word is null""")
-
-            with CopyBuffer() as copystr:
-                for postcode, word in cur:
-                    if postcode is None:
-                        to_delete.append(word)
-                    else:
-                        copystr.add(self._search_normalized(postcode),
-                                    'P', postcode)
-
-                if to_delete:
-                    cur.execute("""DELETE FROM WORD
-                                   WHERE type ='P' and word = any(%s)
-                                """, (to_delete, ))
-
-                copystr.copy_out(cur, 'word',
-                                 columns=['word_token', 'type', 'word'])
-
-
-    def update_special_phrases(self, phrases, should_replace):
+            # First get all postcode names currently in the word table.
+            cur.execute("SELECT DISTINCT word FROM word WHERE type = 'P'")
+            word_entries = set((entry[0] for entry in cur))
+
+            # Then compute the required postcode names from the postcode table.
+            needed_entries = set()
+            cur.execute("SELECT country_code, postcode FROM location_postcode")
+            for cc, postcode in cur:
+                info = PlaceInfo({'country_code': cc,
+                                  'class': 'place', 'type': 'postcode',
+                                  'address': {'postcode': postcode}})
+                address = self.sanitizer.process_names(info)[1]
+                for place in address:
+                    if place.kind == 'postcode':
+                        if analyzer is None:
+                            postcode_name = place.name.strip().upper()
+                            variant_base = None
+                        else:
+                            postcode_name = analyzer.get_canonical_id(place)
+                            variant_base = place.get_attr("variant")
+
+                        if variant_base:
+                            needed_entries.add(f'{postcode_name}@{variant_base}')
+                        else:
+                            needed_entries.add(postcode_name)
+                        break
+
+        # Now update the word table.
+        self._delete_unused_postcode_words(word_entries - needed_entries)
+        self._add_missing_postcode_words(needed_entries - word_entries)
+
+    def _delete_unused_postcode_words(self, tokens: Iterable[str]) -> None:
+        assert self.conn is not None
+        if tokens:
+            with self.conn.cursor() as cur:
+                cur.execute("DELETE FROM word WHERE type = 'P' and word = any(%s)",
+                            (list(tokens), ))
+
+    def _add_missing_postcode_words(self, tokens: Iterable[str]) -> None:
+        assert self.conn is not None
+        if not tokens:
+            return
+
+        analyzer = self.token_analysis.analysis.get('@postcode')
+        terms = []
+
+        for postcode_name in tokens:
+            if '@' in postcode_name:
+                term, variant = postcode_name.split('@', 2)
+                term = self._search_normalized(term)
+                if analyzer is None:
+                    variants = [term]
+                else:
+                    variants = analyzer.compute_variants(variant)
+                    if term not in variants:
+                        variants.append(term)
+            else:
+                variants = [self._search_normalized(postcode_name)]
+            terms.append((postcode_name, variants))
+
+        if terms:
+            with self.conn.cursor() as cur:
+                cur.execute_values("""SELECT create_postcode_word(pc, var)
+                                      FROM (VALUES %s) AS v(pc, var)""",
+                                   terms)
+
+
+
+
+    def update_special_phrases(self, phrases: Iterable[Tuple[str, str, str, str]],
+                               should_replace: bool) -> None:

         """ Replace the search index for special phrases with the new phrases.
             If `should_replace` is True, then the previous set of will be
             completely replaced. Otherwise the phrases are added to the
             already existing ones.
         """
         """ Replace the search index for special phrases with the new phrases.
             If `should_replace` is True, then the previous set of will be
             completely replaced. Otherwise the phrases are added to the
             already existing ones.
         """

+        assert self.conn is not None

         norm_phrases = set(((self._normalized(p[0]), p[1], p[2], p[3])
                             for p in phrases))
 
         norm_phrases = set(((self._normalized(p[0]), p[1], p[2], p[3])
                             for p in phrases))
 


@@ -330,7 +572,9 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
                  len(norm_phrases), added, deleted)
 
 
                  len(norm_phrases), added, deleted)
 
 

-    def _add_special_phrases(self, cursor, new_phrases, existing_phrases):
+    def _add_special_phrases(self, cursor: Cursor,
+                             new_phrases: Set[Tuple[str, str, str, str]],
+                             existing_phrases: Set[Tuple[str, str, str, str]]) -> int:

         """ Add all phrases to the database that are not yet there.
         """
         to_add = new_phrases - existing_phrases
         """ Add all phrases to the database that are not yet there.
         """
         to_add = new_phrases - existing_phrases


@@ -351,9 +595,10 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         return added
 
 
         return added
 
 

-    @staticmethod
-    def _remove_special_phrases(cursor, new_phrases, existing_phrases):
-        """ Remove all phrases from the databse that are no longer in the
+    def _remove_special_phrases(self, cursor: Cursor,
+                             new_phrases: Set[Tuple[str, str, str, str]],
+                             existing_phrases: Set[Tuple[str, str, str, str]]) -> int:
+        """ Remove all phrases from the database that are no longer in the

             new phrase list.
         """
         to_delete = existing_phrases - new_phrases
             new phrase list.
         """
         to_delete = existing_phrases - new_phrases


@@ -369,21 +614,24 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         return len(to_delete)
 
 
         return len(to_delete)
 
 

-    def add_country_names(self, country_code, names):
-        """ Add names for the given country to the search index.
+    def add_country_names(self, country_code: str, names: Mapping[str, str]) -> None:
+        """ Add default names for the given country to the search index.

         """
         # Make sure any name preprocessing for country names applies.
         info = PlaceInfo({'name': names, 'country_code': country_code,
                           'rank_address': 4, 'class': 'boundary',
                           'type': 'administrative'})
         self._add_country_full_names(country_code,
         """
         # Make sure any name preprocessing for country names applies.
         info = PlaceInfo({'name': names, 'country_code': country_code,
                           'rank_address': 4, 'class': 'boundary',
                           'type': 'administrative'})
         self._add_country_full_names(country_code,

-                                     self.sanitizer.process_names(info)[0])
+                                     self.sanitizer.process_names(info)[0],
+                                     internal=True)

 
 
 
 

-    def _add_country_full_names(self, country_code, names):
+    def _add_country_full_names(self, country_code: str, names: Sequence[PlaceName],
+                                internal: bool = False) -> None:

         """ Add names for the given country from an already sanitized
             name list.
         """
         """ Add names for the given country from an already sanitized
             name list.
         """

+        assert self.conn is not None

         word_tokens = set()
         for name in names:
             norm_name = self._search_normalized(name.name)
         word_tokens = set()
         for name in names:
             norm_name = self._search_normalized(name.name)


@@ -392,119 +640,175 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
 
         with self.conn.cursor() as cur:
             # Get existing names
 
         with self.conn.cursor() as cur:
             # Get existing names

-            cur.execute("""SELECT word_token FROM word
-                            WHERE type = 'C' and word = %s""",
+            cur.execute("""SELECT word_token, coalesce(info ? 'internal', false) as is_internal
+                             FROM word
+                             WHERE type = 'C' and word = %s""",

                         (country_code, ))
                         (country_code, ))

-            word_tokens.difference_update((t[0] for t in cur))
+            # internal/external names
+            existing_tokens: Dict[bool, Set[str]] = {True: set(), False: set()}
+            for word in cur:
+                existing_tokens[word[1]].add(word[0])
+
+            # Delete names that no longer exist.
+            gone_tokens = existing_tokens[internal] - word_tokens
+            if internal:
+                gone_tokens.update(existing_tokens[False] & word_tokens)
+            if gone_tokens:
+                cur.execute("""DELETE FROM word
+                               USING unnest(%s) as token
+                               WHERE type = 'C' and word = %s
+                                     and word_token = token""",
+                            (list(gone_tokens), country_code))

 
             # Only add those names that are not yet in the list.
 
             # Only add those names that are not yet in the list.

-            if word_tokens:
-                cur.execute("""INSERT INTO word (word_token, type, word)
-                               (SELECT token, 'C', %s
-                                FROM unnest(%s) as token)
-                            """, (country_code, list(word_tokens)))
-
-            # No names are deleted at the moment.
-            # If deletion is made possible, then the static names from the
-            # initial 'country_name' table should be kept.
-
-
-    def process_place(self, place):
+            new_tokens = word_tokens - existing_tokens[True]
+            if not internal:
+                new_tokens -= existing_tokens[False]
+            if new_tokens:
+                if internal:
+                    sql = """INSERT INTO word (word_token, type, word, info)
+                               (SELECT token, 'C', %s, '{"internal": "yes"}'
+                                  FROM unnest(%s) as token)
+                           """
+                else:
+                    sql = """INSERT INTO word (word_token, type, word)
+                                   (SELECT token, 'C', %s
+                                    FROM unnest(%s) as token)
+                          """
+                cur.execute(sql, (country_code, list(new_tokens)))
+
+
+    def process_place(self, place: PlaceInfo) -> Mapping[str, Any]:

         """ Determine tokenizer information about the given place.
 
             Returns a JSON-serializable structure that will be handed into
             the database via the token_info field.
         """
         """ Determine tokenizer information about the given place.
 
             Returns a JSON-serializable structure that will be handed into
             the database via the token_info field.
         """

-        token_info = _TokenInfo(self._cache)
+        token_info = _TokenInfo()

 
         names, address = self.sanitizer.process_names(place)
 
         if names:
 
         names, address = self.sanitizer.process_names(place)
 
         if names:

-            fulls, partials = self._compute_name_tokens(names)
-
-            token_info.add_names(fulls, partials)
+            token_info.set_names(*self._compute_name_tokens(names))

 
             if place.is_country():
 
             if place.is_country():

+                assert place.country_code is not None

                 self._add_country_full_names(place.country_code, names)
 
         if address:
             self._process_place_address(token_info, address)
 
                 self._add_country_full_names(place.country_code, names)
 
         if address:
             self._process_place_address(token_info, address)
 

-        return token_info.data
+        return token_info.to_dict()

 
 
 
 

-    def _process_place_address(self, token_info, address):
-        hnrs = []
-        addr_terms = []
+    def _process_place_address(self, token_info: '_TokenInfo',
+                               address: Sequence[PlaceName]) -> None:

         for item in address:
             if item.kind == 'postcode':
         for item in address:
             if item.kind == 'postcode':

-                self._add_postcode(item.name)
-            elif item.kind in ('housenumber', 'streetnumber', 'conscriptionnumber'):
-                hnrs.append(item.name)
+                token_info.set_postcode(self._add_postcode(item))
+            elif item.kind == 'housenumber':
+                token_info.add_housenumber(*self._compute_housenumber_token(item))

             elif item.kind == 'street':
             elif item.kind == 'street':

-                token_info.add_street(self._compute_partial_tokens(item.name))
+                token_info.add_street(self._retrieve_full_tokens(item.name))

             elif item.kind == 'place':
             elif item.kind == 'place':

-                token_info.add_place(self._compute_partial_tokens(item.name))
-            elif not item.kind.startswith('_') and \
-                 item.kind not in ('country', 'full'):
-                addr_terms.append((item.kind, self._compute_partial_tokens(item.name)))
-
-        if hnrs:
-            hnrs = self._split_housenumbers(hnrs)
-            token_info.add_housenumbers(self.conn, [self._make_standard_hnr(n) for n in hnrs])
+                if not item.suffix:
+                    token_info.add_place(itertools.chain(*self._compute_name_tokens([item])))
+            elif not item.kind.startswith('_') and not item.suffix and \
+                 item.kind not in ('country', 'full', 'inclusion'):
+                token_info.add_address_term(item.kind,
+                                            itertools.chain(*self._compute_name_tokens([item])))

 
 

-        if addr_terms:
-            token_info.add_address_terms(addr_terms)

 
 

-    def _compute_partial_tokens(self, name):
-        """ Normalize the given term, split it into partial words and return
-            then token list for them.
+    def _compute_housenumber_token(self, hnr: PlaceName) -> Tuple[Optional[int], Optional[str]]:
+        """ Normalize the housenumber and return the word token and the
+            canonical form.

         """
         """

+        assert self.conn is not None
+        analyzer = self.token_analysis.analysis.get('@housenumber')
+        result: Tuple[Optional[int], Optional[str]] = (None, None)
+
+        if analyzer is None:
+            # When no custom analyzer is set, simply normalize and transliterate
+            norm_name = self._search_normalized(hnr.name)
+            if norm_name:
+                result = self._cache.housenumbers.get(norm_name, result)
+                if result[0] is None:
+                    with self.conn.cursor() as cur:
+                        hid = cur.scalar("SELECT getorcreate_hnr_id(%s)", (norm_name, ))
+
+                        result = hid, norm_name
+                        self._cache.housenumbers[norm_name] = result
+        else:
+            # Otherwise use the analyzer to determine the canonical name.
+            # Per convention we use the first variant as the 'lookup name', the
+            # name that gets saved in the housenumber field of the place.
+            word_id = analyzer.get_canonical_id(hnr)
+            if word_id:
+                result = self._cache.housenumbers.get(word_id, result)
+                if result[0] is None:
+                    variants = analyzer.compute_variants(word_id)
+                    if variants:
+                        with self.conn.cursor() as cur:
+                            hid = cur.scalar("SELECT create_analyzed_hnr_id(%s, %s)",
+                                             (word_id, list(variants)))
+                            result = hid, variants[0]
+                            self._cache.housenumbers[word_id] = result
+
+        return result
+
+
+    def _retrieve_full_tokens(self, name: str) -> List[int]:
+        """ Get the full name token for the given name, if it exists.
+            The name is only retrieved for the standard analyser.
+        """
+        assert self.conn is not None

         norm_name = self._search_normalized(name)
 
         norm_name = self._search_normalized(name)
 

-        tokens = []
-        need_lookup = []
-        for partial in norm_name.split():
-            token = self._cache.partials.get(partial)
-            if token:
-                tokens.append(token)
-            else:
-                need_lookup.append(partial)
+        # return cached if possible
+        if norm_name in self._cache.fulls:
+            return self._cache.fulls[norm_name]

 
 

-        if need_lookup:
-            with self.conn.cursor() as cur:
-                cur.execute("""SELECT word, getorcreate_partial_word(word)
-                               FROM unnest(%s) word""",
-                            (need_lookup, ))
+        with self.conn.cursor() as cur:
+            cur.execute("SELECT word_id FROM word WHERE word_token = %s and type = 'W'",
+                        (norm_name, ))
+            full = [row[0] for row in cur]

 
 

-                for partial, token in cur:
-                    tokens.append(token)
-                    self._cache.partials[partial] = token
+        self._cache.fulls[norm_name] = full

 
 

-        return tokens
+        return full

 
 
 
 

-    def _compute_name_tokens(self, names):
+    def _compute_name_tokens(self, names: Sequence[PlaceName]) -> Tuple[Set[int], Set[int]]:

         """ Computes the full name and partial name tokens for the given
             dictionary of names.
         """
         """ Computes the full name and partial name tokens for the given
             dictionary of names.
         """

-        full_tokens = set()
-        partial_tokens = set()
+        assert self.conn is not None
+        full_tokens: Set[int] = set()
+        partial_tokens: Set[int] = set()

 
         for name in names:
 
         for name in names:

-            norm_name = self._normalized(name.name)
-            full, part = self._cache.names.get(norm_name, (None, None))
+            analyzer_id = name.get_attr('analyzer')
+            analyzer = self.token_analysis.get_analyzer(analyzer_id)
+            word_id = analyzer.get_canonical_id(name)
+            if analyzer_id is None:
+                token_id = word_id
+            else:
+                token_id = f'{word_id}@{analyzer_id}'
+
+            full, part = self._cache.names.get(token_id, (None, None))

             if full is None:
             if full is None:

-                variants = self.token_analysis.get_variants_ascii(norm_name)
+                variants = analyzer.compute_variants(word_id)

                 if not variants:
                     continue
 
                 with self.conn.cursor() as cur:
                 if not variants:
                     continue
 
                 with self.conn.cursor() as cur:

-                    cur.execute("SELECT (getorcreate_full_word(%s, %s)).*",
-                                (norm_name, variants))
-                    full, part = cur.fetchone()
+                    cur.execute("SELECT * FROM getorcreate_full_word(%s, %s)",
+                                (token_id, variants))
+                    full, part = cast(Tuple[int, List[int]], cur.fetchone())
+
+                self._cache.names[token_id] = (full, part)

 
 

-                self._cache.names[norm_name] = (full, part)
+            assert part is not None

 
             full_tokens.add(full)
             partial_tokens.update(part)
 
             full_tokens.add(full)
             partial_tokens.update(part)


@@ -512,94 +816,126 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         return full_tokens, partial_tokens
 
 
         return full_tokens, partial_tokens
 
 

-    def _add_postcode(self, postcode):
+    def _add_postcode(self, item: PlaceName) -> Optional[str]:

         """ Make sure the normalized postcode is present in the word table.
         """
         """ Make sure the normalized postcode is present in the word table.
         """

-        if re.search(r'[:,;]', postcode) is None:
-            postcode = self.normalize_postcode(postcode)
+        assert self.conn is not None
+        analyzer = self.token_analysis.analysis.get('@postcode')

 
 

-            if postcode not in self._cache.postcodes:
-                term = self._search_normalized(postcode)
-                if not term:
-                    return
+        if analyzer is None:
+            postcode_name = item.name.strip().upper()
+            variant_base = None
+        else:
+            postcode_name = analyzer.get_canonical_id(item)
+            variant_base = item.get_attr("variant")

 
 

-                with self.conn.cursor() as cur:
-                    # no word_id needed for postcodes
-                    cur.execute("""INSERT INTO word (word_token, type, word)
-                                   (SELECT %s, 'P', pc FROM (VALUES (%s)) as v(pc)
-                                    WHERE NOT EXISTS
-                                     (SELECT * FROM word
-                                      WHERE type = 'P' and word = pc))
-                                """, (term, postcode))
-                self._cache.postcodes.add(postcode)
-
-
-    @staticmethod
-    def _split_housenumbers(hnrs):
-        if len(hnrs) > 1 or ',' in hnrs[0] or ';' in hnrs[0]:
-            # split numbers if necessary
-            simple_list = []
-            for hnr in hnrs:
-                simple_list.extend((x.strip() for x in re.split(r'[;,]', hnr)))
-
-            if len(simple_list) > 1:
-                hnrs = list(set(simple_list))
-            else:
-                hnrs = simple_list
+        if variant_base:
+            postcode = f'{postcode_name}@{variant_base}'
+        else:
+            postcode = postcode_name
+
+        if postcode not in self._cache.postcodes:
+            term = self._search_normalized(postcode_name)
+            if not term:
+                return None

 
 

-        return hnrs
+            variants = {term}
+            if analyzer is not None and variant_base:
+                variants.update(analyzer.compute_variants(variant_base))

 
 

+            with self.conn.cursor() as cur:
+                cur.execute("SELECT create_postcode_word(%s, %s)",
+                            (postcode, list(variants)))
+            self._cache.postcodes.add(postcode)

 
 

+        return postcode_name

 
 
 class _TokenInfo:
     """ Collect token information to be sent back to the database.
     """
 
 
 class _TokenInfo:
     """ Collect token information to be sent back to the database.
     """

-    def __init__(self, cache):
-        self._cache = cache
-        self.data = {}
+    def __init__(self) -> None:
+        self.names: Optional[str] = None
+        self.housenumbers: Set[str] = set()
+        self.housenumber_tokens: Set[int] = set()
+        self.street_tokens: Optional[Set[int]] = None
+        self.place_tokens: Set[int] = set()
+        self.address_tokens: Dict[str, str] = {}
+        self.postcode: Optional[str] = None

 
 

-    @staticmethod
-    def _mk_array(tokens):
-        return '{%s}' % ','.join((str(s) for s in tokens))

 
 

+    def _mk_array(self, tokens: Iterable[Any]) -> str:
+        return f"{{{','.join((str(s) for s in tokens))}}}"

 
 

-    def add_names(self, fulls, partials):
+
+    def to_dict(self) -> Dict[str, Any]:
+        """ Return the token information in database importable format.
+        """
+        out: Dict[str, Any] = {}
+
+        if self.names:
+            out['names'] = self.names
+
+        if self.housenumbers:
+            out['hnr'] = ';'.join(self.housenumbers)
+            out['hnr_tokens'] = self._mk_array(self.housenumber_tokens)
+
+        if self.street_tokens is not None:
+            out['street'] = self._mk_array(self.street_tokens)
+
+        if self.place_tokens:
+            out['place'] = self._mk_array(self.place_tokens)
+
+        if self.address_tokens:
+            out['addr'] = self.address_tokens
+
+        if self.postcode:
+            out['postcode'] = self.postcode
+
+        return out
+
+
+    def set_names(self, fulls: Iterable[int], partials: Iterable[int]) -> None:

         """ Adds token information for the normalised names.
         """
         """ Adds token information for the normalised names.
         """

-        self.data['names'] = self._mk_array(itertools.chain(fulls, partials))
+        self.names = self._mk_array(itertools.chain(fulls, partials))

 
 
 
 

-    def add_housenumbers(self, conn, hnrs):
+    def add_housenumber(self, token: Optional[int], hnr: Optional[str]) -> None:

         """ Extract housenumber information from a list of normalised
             housenumbers.
         """
         """ Extract housenumber information from a list of normalised
             housenumbers.
         """

-        self.data['hnr_tokens'] = self._mk_array(self._cache.get_hnr_tokens(conn, hnrs))
-        self.data['hnr'] = ';'.join(hnrs)
+        if token:
+            assert hnr is not None
+            self.housenumbers.add(hnr)
+            self.housenumber_tokens.add(token)

 
 
 
 

-    def add_street(self, tokens):
+    def add_street(self, tokens: Iterable[int]) -> None:

         """ Add addr:street match terms.
         """
         """ Add addr:street match terms.
         """

-        if tokens:
-            self.data['street'] = self._mk_array(tokens)
+        if self.street_tokens is None:
+            self.street_tokens = set()
+        self.street_tokens.update(tokens)

 
 
 
 

-    def add_place(self, tokens):
+    def add_place(self, tokens: Iterable[int]) -> None:

         """ Add addr:place search and match terms.
         """
         """ Add addr:place search and match terms.
         """

-        if tokens:
-            self.data['place'] = self._mk_array(tokens)
+        self.place_tokens.update(tokens)

 
 
 
 

-    def add_address_terms(self, terms):
+    def add_address_term(self, key: str, partials: Iterable[int]) -> None:

         """ Add additional address terms.
         """
         """ Add additional address terms.
         """

-        tokens = {key: self._mk_array(partials)
-                  for key, partials in terms if partials}
+        array = self._mk_array(partials)
+        if len(array) > 2:
+            self.address_tokens[key] = array

 
 

-        if tokens:
-            self.data['addr'] = tokens
+    def set_postcode(self, postcode: Optional[str]) -> None:
+        """ Set the postcode to the given one.
+        """
+        self.postcode = postcode

 
 
 class _TokenCache:
 
 
 class _TokenCache:


@@ -608,34 +944,9 @@ class _TokenCache:
         This cache is not thread-safe and needs to be instantiated per
         analyzer.
     """
         This cache is not thread-safe and needs to be instantiated per
         analyzer.
     """

-    def __init__(self):
-        self.names = {}
-        self.partials = {}
-        self.postcodes = set()
-        self.housenumbers = {}
-
-
-    def get_hnr_tokens(self, conn, terms):
-        """ Get token ids for a list of housenumbers, looking them up in the
-            database if necessary. `terms` is an iterable of normalized
-            housenumbers.
-        """
-        tokens = []
-        askdb = []
-
-        for term in terms:
-            token = self.housenumbers.get(term)
-            if token is None:
-                askdb.append(term)
-            else:
-                tokens.append(token)
-
-        if askdb:
-            with conn.cursor() as cur:
-                cur.execute("SELECT nr, getorcreate_hnr_id(nr) FROM unnest(%s) as nr",
-                            (askdb, ))
-                for term, tid in cur:
-                    self.housenumbers[term] = tid
-                    tokens.append(tid)
-
-        return tokens
+    def __init__(self) -> None:
+        self.names: Dict[str, Tuple[int, List[int]]] = {}
+        self.partials: Dict[str, int] = {}
+        self.fulls: Dict[str, List[int]] = {}
+        self.postcodes: Set[str] = set()
+        self.housenumbers: Dict[str, Tuple[Optional[int], Optional[str]]] = {}