CREATE TABLE memos (
  id integer,
  content text
);

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');
INSERT INTO memos VALUES (4, 'groonga command is provided');

CREATE INDEX grnindex ON memos USING pgroonga (content pgroonga_text_regexp_ops);

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

SELECT id, content
  FROM memos
 WHERE content ILIKE '%GROONGA';

DROP TABLE memos;
