Metabase Query with ABS function throw error with Pivot table

Hi!

Based on docs, Cube supports ABS in projections (e.g., SELECT).
But when we use a pivot table in Metabase, it generates a query like this, and then Cube throws an error.

Error:
```
Error executing query: ERROR: Error during rewrite: Can't detect Cube query and it may be not supported yet. Please check logs for additional information.
```

Query:
```sql
select
"source"."calendar_retention_by_day" as "calendar_retention_by_day",
"source"."pivot-grouping" as "pivot-grouping",
sum("source"."measure__af_ad_revenue") as "sum_2"
from
(
select
"public"."cohort_analysis"."measure__af_ad_revenue"
as "measure__af_ad_revenue",
"public"."cohort_analysis"."cohort_date" as "cohort_date",
"public"."cohort_analysis"."calendar_retention_by_day"
as "calendar_retention_by_day",
abs(0) as "pivot-grouping"
from "public"."cohort_analysis"
where
(
"public"."cohort_analysis"."cohort_date"
>= cast(cast((now() + interval '-7 day') as date) as timestamp)
)
and (
"public"."cohort_analysis"."cohort_date"
< cast(cast(now() as date) as timestamp)
)
) as "source"
group by "source"."calendar_retention_by_day", "source"."pivot-grouping"
order by "source"."calendar_retention_by_day" asc, "source"."pivot-grouping" asc
```

Can you add abs function support?

cube: v1.2.9 (push_dowh = false)
metabase: v0.53.5