## Bug description

When calculating Trends results with an aggregated (e.g. single output, like big number) display type, WAU/MAU don't work. This is because we have an `ACTIVE_USERS_SQL` query for time series display types, but we don't have a version of this for aggregated display types. (See ZEN-1043.)

## How to reproduce

1. Create an insight with a single WAU or MAU series.
2. Switch display type to "Number".
3. Open the "Debug ClickHouse queries" modal from the command palette.
4. See `COUNT(*)` instead of `COUNT(DISTINCT person_id)`.

#### *Thank you* for your bug report – we love squashing them!

posthog/queries/person_query.py
HAVING max(is_deleted) = 0
            {grouped_person_filters} {search_clause} {distinct_id_clause} {email_clause}
            {"ORDER BY max(created_at) DESC, id" if paginate else ""}
            {limit_offset}
        """
            if person_filters
            else f"""
            SELECT {fields}
            FROM person
            {cohort_query}
            WHERE team_id = %(team_id)s
            GROUP BY id
            HAVING max(is_deleted) = 0
            {grouped_person_filters} {search_clause} {distinct_id_clause} {email_clause}
            {"ORDER BY max(created_at) DESC, id" if paginate else ""}
            {limit_offset}
        """,
            {
                **person_params,
                **grouped_person_params,
                **cohort_params,
                **limit_params,
                **search_params,
                **distinct_id_params,
                **email_params,
                "team_id": self._team_id,
            },
        )
    @property
    def fields(self) -> List[ColumnName]: