CriteriaQuery<Tuple> criteria = cb.createTupleQuery();
Root<Item> i = criteria.from(Item.class);
i.alias("i");
criteria.multiselect(
    i.get("id").alias("itemId"),
    i.get("name").alias("name"),
    i.get("auctionEnd").alias("auctionEnd")
);

Query query = em.createQuery(criteria);
org.hibernate.Query hibernateQuery = ((HibernateQuery)query).getHibernateQuery();

assertEquals(
    hibernateQuery.getQueryString(),
    "select i.id as itemId, i.name as name, i.auctionEnd as auctionEnd from Item as i"
);
// Actual: select i.id, i.name, i.auctionEnd from Item as i

assertEquals(
    hibernateQuery.getReturnAliases(),
    new String[] {"itemId", "name", "auctionEnd"}
);
// Actual: 0, 1, 2