code: func (s *Store) Query(qr *QueryRequest) (*QueryResponse, error) {
  	return s.query(nil, qr)
  }
docs: // Query executes queries that return rows, and do not modify the database.
  // The queries are made using the database connection built-in to the Store.
  // Depending on the read consistency requested, it may or may not need to be
  // called on the leader.