text: CREATE TABLE memos (
    id integer,
    user_name text,
    record jsonb
  );
  
  CREATE USER alice NOLOGIN;
  GRANT ALL ON TABLE memos TO alice;
  
  INSERT INTO memos VALUES
    (1,
     'nonexistent',
     '{"title": "PostgreSQL", "content": "PostgreSQL is a RDBMS."}');
  INSERT INTO memos VALUES
    (2,
     'alice',
     '{"title": "Groonga", "content": "Groonga is fast full text search engine."}');
  INSERT INTO memos VALUES
    (3,
     'alice',
     '{"title": "PGroonga", "content": "PGroonga is a PostgreSQL extension that uses Groonga."}');
  
  ALTER TABLE memos ENABLE ROW LEVEL SECURITY;
  CREATE POLICY memos_myself ON memos USING (user_name = current_user);
  
  CREATE INDEX pgrn_index ON memos
   USING pgroonga (record pgroonga_jsonb_full_text_search_ops_v2);
  
  SET enable_seqscan = off;
  SET enable_indexscan = off;
  SET enable_bitmapscan = on;
  
  SET SESSION AUTHORIZATION alice;
  \pset format unaligned
  EXPLAIN (COSTS OFF)
  SELECT id, record
    FROM memos
   WHERE record &@ 'groonga'
  \g |sed -r -e "s/\(CURRENT_USER\)::text/CURRENT_USER/g"
  \pset format aligned
  
  SELECT id, record
    FROM memos
   WHERE record &@ 'groonga';
  RESET SESSION AUTHORIZATION;
  
  DROP TABLE memos;
  
  DROP USER alice;
  