Builds the query for this quick filter.
        
        :return     <orb.Query>

def query(self):
        """
        Builds the query for this quick filter.
        
        :return     <orb.Query>
        """
        output = Query()
        for column, op, plugin, editor in self._plugins:
            query = Query(column)
            if plugin.setupQuery(query, op, editor):
                output &= query
        return output