code: func (stub *MockStub) GetQueryResult(query string) (StateQueryIteratorInterface, error) {
  	// Not implemented since the mock engine does not have a query engine.
  	// However, a very simple query engine that supports string matching
  	// could be implemented to test that the framework supports queries
  	return nil, errors.New("not implemented")
  }
docs: // GetQueryResult function can be invoked by a chaincode to perform a
  // rich query against state database.  Only supported by state database implementations
  // that support rich query.  The query string is in the syntax of the underlying
  // state database. An iterator is returned which can be used to iterate (next) over
  // the query result set