Gather the tags for this row of the table (index) based on the
        results (all the results from the query).
        index_tags and column_tags are the tags to gather.
         - Those specified in index_tags contain the tag_group name and the
           index of the value we want to extract from the index tuple.
           cf. 1 for ipVersion in the IP-MIB::ipSystemStatsTable for example
         - Those specified in column_tags contain the name of a column, which
           could be a potential result, to use as a tage
           cf. ifDescr in the IF-MIB::ifTable for example

def get_index_tags(self, index, results, index_tags, column_tags):
        '''
        Gather the tags for this row of the table (index) based on the
        results (all the results from the query).
        index_tags and column_tags are the tags to gather.
         - Those specified in index_tags contain the tag_group name and the
           index of the value we want to extract from the index tuple.
           cf. 1 for ipVersion in the IP-MIB::ipSystemStatsTable for example
         - Those specified in column_tags contain the name of a column, which
           could be a potential result, to use as a tage
           cf. ifDescr in the IF-MIB::ifTable for example
        '''
        tags = []
        for idx_tag in index_tags:
            tag_group = idx_tag[0]
            try:
                tag_value = index[idx_tag[1] - 1].prettyPrint()
            except IndexError:
                self.log.warning("Not enough indexes, skipping this tag")
                continue
            tags.append("{}:{}".format(tag_group, tag_value))
        for col_tag in column_tags:
            tag_group = col_tag[0]
            try:
                tag_value = results[col_tag[1]][index]
            except KeyError:
                self.log.warning("Column %s not present in the table, skipping this tag", col_tag[1])
                continue
            if reply_invalid(tag_value):
                self.log.warning("Can't deduct tag from column for tag %s", tag_group)
                continue
            tag_value = tag_value.prettyPrint()
            tags.append("{}:{}".format(tag_group, tag_value))
        return tags