code: def _filter_startswith(self, term, field_name, field_type, is_not):
          
          if field_type == 'text':
              if len(term.split()) == 1:
                  term = '^ %s*' % term
                  query = self.backend.parse_query(term)
              else:
                  term = '^ %s' % term
                  query = self._phrase_query(term.split(), field_name, field_type)
          else:
              term = '^%s*' % term
              query = self.backend.parse_query(term)
  
          if is_not:
              return xapian.Query(xapian.Query.OP_AND_NOT, self._all_query(), query)
          return query
docs: Returns a startswith query on the un-stemmed term.
  
          Assumes term is not a list.