## 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/trends/total_volume.py
enumerate_time_range,
    parse_response,
    process_math,
)
from posthog.queries.util import TIME_IN_SECONDS, get_interval_func_ch, get_trunc_func_ch, start_of_week_fix
from posthog.utils import encode_get_request_params
class TrendsTotalVolume:
    def _total_volume_query(self, entity: Entity, filter: Filter, team: Team) -> Tuple[str, Dict, Callable]:
        trunc_func = get_trunc_func_ch(filter.interval)
        interval_func = get_interval_func_ch(filter.interval)
        aggregate_operation, join_condition, math_params = process_math(entity, team, person_id_alias="person_id")
        trend_event_query = TrendsEventQuery(
            filter=filter,
            entity=entity,
            team=team,
            should_join_distinct_ids=True
            if join_condition != ""
            or (entity.math in [WEEKLY_ACTIVE, MONTHLY_ACTIVE] and not team.aggregate_users_by_distinct_id)
            else False,
            using_person_on_events=team.actor_on_events_querying_enabled,
        )
        event_query, event_query_params = trend_event_query.get_query()
        content_sql_params = {
            "aggregate_operation": aggregate_operation,
            "timestamp": "e.timestamp",
            "interval": trunc_func,
            "interval_func": interval_func,
        }
        params: Dict = {"team_id": team.id, "timezone": team.timezone}
        params = {**params, **math_params, **event_query_params}