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avoid LookupAny with address and too many name tokens

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The index for nameaddress_vector has grown so large that PostgreSQL
will resort to a sequential scan if there are too many items
in the LookupAny list.
This commit is contained in:
Sarah Hoffmann 2024-01-29 16:52:14 +01:00
parent 76eadc562c
commit 33c0f249b1
1 changed files with 5 additions and 4 deletions
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9
nominatim/api/search/db_search_builder.py
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@ -176,11 +176,12 @@ class SearchBuilder:
sdata.lookups.append(dbf.FieldLookup('nameaddress_vector', sdata.lookups.append(dbf.FieldLookup('nameaddress_vector',
list(partials), lookups.LookupAll)) list(partials), lookups.LookupAll))
else: 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( sdata.lookups.append(
dbf.FieldLookup('nameaddress_vector', dbf.FieldLookup('nameaddress_vector', addr_fulls, lookups.LookupAny))
[t.token for t
in self.query.get_tokens(address[0], TokenType.WORD)],
lookups.LookupAny))
sdata.housenumbers = dbf.WeightedStrings([], []) sdata.housenumbers = dbf.WeightedStrings([], [])
yield dbs.PlaceSearch(0.05, sdata, expected_count) yield dbs.PlaceSearch(0.05, sdata, expected_count)