Fix city search word order

Word ordering affects the text index so keep the word ordering in location_city_words the same as the order of words in the location columns

migrations/1628163172-location_city_search_word_order.sql

@@ -0,0 +1,37 @@
+-- migrations/1628163172-location_city_search_word_order.sql
+-- :up
+
+create or replace function location_city_words(l locations) returns text as $$
+begin
+    return (select string_agg(word, ' ' order by rn)
+        from (select word, min(rn) as rn
+            from regexp_split_to_table(
+                        lower(
+                            coalesce(l.long_city, '') || ' ' || coalesce(l.short_city, '') || ' ' || 
+                            coalesce(l.long_state, '') || ' ' || coalesce(l.short_state, '') || ' ' ||
+                            coalesce(l.long_country, '') || ' ' || coalesce(l.short_country, '') || ' '                            
+                        ) , '\s'
+                     ) with ordinality x(word, rn) where length(word) >= 3
+            group by word) x);
+end;
+$$ language plpgsql;
+
+update locations set search_city = location_city_words(locations::locations);
+
+-- :down
+
+create or replace function location_words(l locations) returns text as $$
+begin
+    return (select string_agg(distinct word, ' ')
+            from regexp_split_to_table(
+                    lower(
+                        coalesce(l.long_city, '') || ' ' || coalesce(l.short_city, '') || ' ' ||
+                        coalesce(l.long_state, '') || ' ' || coalesce(l.short_state, '') || ' ' ||
+                        coalesce(l.long_country, '') || ' ' || coalesce(l.short_country, '') || ' ' ||
+                        coalesce(l.long_street, '') || ' ' || coalesce(l.short_street, '')
+                    ) , '\s'
+                 ) as word where length(word) >= 3);
+end;
+$$ language plpgsql;
+
+update locations set search_city = location_city_words(locations::locations);