text: CREATE TABLE memos (
    id integer,
    title text,
    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.');
  
  CREATE INDEX grnindex ON memos USING pgroonga (title, content);
  
  SET enable_seqscan = off;
  SET enable_indexscan = off;
  SET enable_bitmapscan = on;
  
  SELECT id, title, content
    FROM memos
   WHERE title %% 'Groonga';
  
  SELECT id, title, content
    FROM memos
   WHERE content %% 'Groonga';
  
  DROP TABLE memos;
  