def filter_count_predicate(self, qs: QuerySet) -> CustomCountQuerySet:
inner_query = stringify_queryset(qs)
qs = CustomCountQuerySet.wrap(qs) # type: CustomCountQuerySet
full_query = f'SELECT COUNT(text_unit_id) FROM ({inner_query} LIMIT {self.LIMIT_QUERY}) AS temp;'
qs.set_optional_count_query(full_query)
return qs
