text: CREATE TABLE logs (
    id int,
    record jsonb
  );
  
  INSERT INTO logs VALUES (1, '{"message": {"code": 100, "content": "hello"}}');
  INSERT INTO logs VALUES (1, '{"message": "hello"}');
  INSERT INTO logs VALUES (1, '{"message": ["hello", "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 &` 'paths @ ".message" && type == "object"'
   ORDER BY id;
  
  DROP TABLE logs;
  