do not use index when searching in large areas

[nominatim.git] / nominatim / api / search / db_searches.py

diff --git a/nominatim/api/search/db_searches.py b/nominatim/api/search/db_searches.py
index 77d9f848b77231f065141c33883e1bc1c6b3676c..02a45e7c2d4d9f7db707dc3d69f8cc6051691199 100644 (file)
--- a/nominatim/api/search/db_searches.py
+++ b/nominatim/api/search/db_searches.py
@@ -622,7 +622,10 @@ class PlaceSearch(AbstractSearch):
 
         if details.viewbox is not None:
             if details.bounded_viewbox:
-                sql = sql.where(tsearch.c.centroid.intersects(VIEWBOX_PARAM))
+                if details.viewbox.area < 0.2:
+                    sql = sql.where(tsearch.c.centroid.intersects(VIEWBOX_PARAM))
+                else:
+                    sql = sql.where(tsearch.c.centroid.ST_Intersects_no_index(VIEWBOX_PARAM))
             else:
                 penalty += sa.case((t.c.geometry.intersects(VIEWBOX_PARAM), 0.0),
                                    (t.c.geometry.intersects(VIEWBOX2_PARAM), 1.0),
@@ -630,7 +633,11 @@ class PlaceSearch(AbstractSearch):
 
         if details.near is not None:
             if details.near_radius is not None:
-                sql = sql.where(tsearch.c.centroid.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM))
+                if details.near_radius < 0.1:
+                    sql = sql.where(tsearch.c.centroid.ST_DWithin(NEAR_PARAM, NEAR_RADIUS_PARAM))
+                else:
+                    sql = sql.where(tsearch.c.centroid.ST_DWithin_no_index(NEAR_PARAM,
+                                                                           NEAR_RADIUS_PARAM))
             sql = sql.add_columns(-tsearch.c.centroid.ST_Distance(NEAR_PARAM)
                                       .label('importance'))
             sql = sql.order_by(sa.desc(sa.text('importance')))