def executeAndWait(self, query, clientCtx):
    """
    run a query synchronously and return a handle (QueryHandle).

    Parameters:
     - query
     - clientCtx
    """
    self.send_executeAndWait(query, clientCtx)
    return self.recv_executeAndWait()
run a query synchronously and return a handle (QueryHandle).

    Parameters:
     - query
     - clientCtx