text: CREATE TABLE fruits (
    id int,
    items jsonb
  );
  
  INSERT INTO fruits VALUES (1, '{"name": "apple"}');
  INSERT INTO fruits VALUES (2, '{"type": "apple"}');
  INSERT INTO fruits VALUES (3, '{"name": "peach"}');
  
  CREATE INDEX pgroonga_index ON fruits
    USING pgroonga (items pgroonga_jsonb_ops);
  
  SET enable_seqscan = off;
  SET enable_indexscan = on;
  SET enable_bitmapscan = off;
  
  SELECT id, items
    FROM fruits
   WHERE items &` 'string == "apple"'
   ORDER BY id;
  
  DROP TABLE fruits;
  