Trek

postgresql-entrypoint-initdb.d/09_json.sql

@@ -3,9 +3,40 @@ create table item (
   data jsonb
 );
 
-CREATE INDEX idx_item_data
-  ON item USING gin (data jsonb_path_ops);
+create index idx_item_data
+  on item using gin (data jsonb_path_ops);
 
+alter table item
+add column description_tsv tsvector generated always as (
+  to_tsvector('french', data->>'description')
+) stored;
+
+create index idx_item_description_tsv
+  on item
+  using gin (description_tsv);
+
+alter table item
+add column search_tsv tsvector generated always as (
+  setweight(to_tsvector('french', coalesce(data->>'description', '')), 'A') ||
+  setweight(to_tsvector('french', coalesce(data->>'nom', '')), 'B') ||
+  setweight(to_tsvector('french', coalesce(data->>'categorie', '')), 'C')
+) STORED;
+
+
+CREATE INDEX idx_item_search_tsv
+  ON item
+  USING gin (search_tsv);
+
+/*
+SELECT
+  id,
+  ts_rank(search_tsv, plainto_tsquery('french', 'miel lavande')) AS rank
+FROM item
+WHERE search_tsv @@ plainto_tsquery('french', 'miel lavande')
+ORDER BY rank DESC;
+*/
+
+truncate table item;
 
 DO $$
 DECLARE