From: Sarah Hoffmann <lonvia@denofr.de>
Date: Tue, 4 Jul 2023 14:54:42 +0000 (+0200)
Subject: add a small penalty to lookups in address vectors
X-Git-Tag: v4.3.0~56^2~5
X-Git-Url: https://git.openstreetmap.org./nominatim.git/commitdiff_plain/3266daa8fde98acc1fe4c9929cb5be3aed662add?hp=ce17b0eecaa7add29e4eb04e06b2580daa656bf2

add a small penalty to lookups in address vectors
---

diff --git a/nominatim/api/search/db_search_builder.py b/nominatim/api/search/db_search_builder.py
index 9ff8c03c..67db3247 100644
--- a/nominatim/api/search/db_search_builder.py
+++ b/nominatim/api/search/db_search_builder.py
@@ -210,7 +210,9 @@ class SearchBuilder:
         exp_addr_count = min(t.count for t in addr_partials) if addr_partials else exp_name_count
         if exp_addr_count < 1000 and partials_indexed:
             # Lookup by address partials and restrict results through name terms.
-            yield penalty, exp_addr_count,\
+            # Give this a small penalty because lookups in the address index are
+            # more expensive
+            yield penalty + exp_addr_count/5000, exp_addr_count,\
                   [dbf.FieldLookup('name_vector', [t.token for t in name_partials], 'restrict'),
                    dbf.FieldLookup('nameaddress_vector', addr_tokens, 'lookup_all')]
             return