<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _parse_vrf_query(self, query_str):
 """ Parse a smart search query for VRFs This is a helper function to smart_search_vrf for easier unit testing of the parser. """

        sp = smart_parsing.VrfSmartParser()
        query = sp.parse(query_str)
        return query