CREATE TABLE fruits (
  id int,
  items jsonb
);

INSERT INTO fruits VALUES (1, '["apple"]');
INSERT INTO fruits VALUES (2, '["banana", "apple"]');
INSERT INTO fruits VALUES (3, '["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;
