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do not rerank address by full match in postcode search

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The reranking result will not be completely correct because
the address of a postcode refer to the address _and_ name
of the parent and reranking was only done against the
address. We assume here that the postcode is precise enough
as to not require a penalty to to partial matches.
This commit is contained in:
Sarah Hoffmann
2025-02-20 10:15:03 +01:00
parent 97ed168996
commit add9244a2f
1 changed files with 6 additions and 2 deletions
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8
src/nominatim_api/search/db_searches.py
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@@ -581,9 +581,13 @@ class PostcodeSearch(AbstractSearch):
.where((tsearch.c.name_vector + tsearch.c.nameaddress_vector) .where((tsearch.c.name_vector + tsearch.c.nameaddress_vector)
.contains(sa.type_coerce(self.lookups[0].tokens, .contains(sa.type_coerce(self.lookups[0].tokens,
IntArray))) IntArray)))
# Do NOT add rerank penalties based on the address terms.
# The standard rerank penalty only checks the address vector
# while terms may appear in name and address vector. This would
# lead to overly high penalties.
# We assume that a postcode is precise enough to not require
# additional full name matches.
for ranking in self.rankings:
penalty += ranking.sql_penalty(conn.t.search_name)
penalty += sa.case(*((t.c.postcode == v, p) for v, p in self.postcodes), penalty += sa.case(*((t.c.postcode == v, p) for v, p in self.postcodes),
else_=1.0) else_=1.0)