CREATE TABLE memos (
  id integer,
  content varchar(256)
);

INSERT INTO memos VALUES (1, 'PostgreSQL is a RDBMS.');
INSERT INTO memos VALUES (2, 'Groonga is fast full text search engine.');
INSERT INTO memos VALUES (3, 'PGroonga is a PostgreSQL extension that uses Groonga.');

CREATE INDEX pgrn_index ON memos
 USING pgroonga (content pgroonga.varchar_full_text_search_ops_v2);

SET enable_seqscan = off;
SET enable_indexscan = off;
SET enable_bitmapscan = on;

EXPLAIN (COSTS OFF)
SELECT id, content
  FROM memos
 WHERE content &@~| Array['rdbms', 'groonga engine']::varchar[];

SELECT id, content
  FROM memos
 WHERE content &@~| Array['rdbms', 'groonga engine']::varchar[];

DROP TABLE memos;
