text: CREATE TABLE logs (
    id int,
    record jsonb
  );
  
  INSERT INTO logs VALUES (1, '{"message": "Hello World"}');
  INSERT INTO logs VALUES (2, '{"message": "This is a pen"}');
  INSERT INTO logs VALUES (3, '{"message": "Good-by World"}');
  
  CREATE INDEX pgroonga_index ON logs
    USING pgroonga (record pgroonga_jsonb_ops);
  
  SET enable_seqscan = off;
  SET enable_indexscan = on;
  SET enable_bitmapscan = off;
  
  SELECT id, record
    FROM logs
   WHERE record @@ 'string @ "world"'
   ORDER BY id;
  
  DROP TABLE logs;
  