update licenses and discussion links

[nominatim.git] / lib-sql / functions / ranking.sql

diff --git a/lib-sql/functions/ranking.sql b/lib-sql/functions/ranking.sql
index 1f2362114c322077a281f4d59f029181341e3913..97a0cde38e2b6aa6ef8aebf63af2611894502fbd 100644 (file)
--- a/lib-sql/functions/ranking.sql
+++ b/lib-sql/functions/ranking.sql
@@ -1,3 +1,10 @@
+-- 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.
+
 -- Functions related to search and address ranks
 
 -- Return an approximate search radius according to the search rank.
@@ -277,3 +284,24 @@ BEGIN
 END;
 $$
 LANGUAGE plpgsql IMMUTABLE;
+
+
+CREATE OR REPLACE FUNCTION weigh_search(search_vector INT[],
+                                        rankings TEXT,
+                                        def_weight FLOAT)
+  RETURNS FLOAT
+  AS $$
+DECLARE
+  rank JSON;
+BEGIN
+  FOR rank IN
+    SELECT * FROM json_array_elements(rankings::JSON)
+  LOOP
+    IF true = ALL(SELECT x::int = ANY(search_vector) FROM json_array_elements_text(rank->1) as x) THEN
+      RETURN (rank->>0)::float;
+    END IF;
+  END LOOP;
+  RETURN def_weight;
+END;
+$$
+LANGUAGE plpgsql IMMUTABLE;