tableau - Cannot use calculated offset in BigQuery's DATE_ADD function -


i'm trying create custom query in tableau use on google's bigquery. goal have offset parameter in tableau changes offsets used in date based clause.

in tableau this:

  select date_add(utc_usec_to_month(current_date()),<parameters.offset>-1,"month") month_index, count(distinct user_id, 1000000) distinct_count   [orders]   order_date >= date_add(utc_usec_to_month(current_date()),<parameters.offset>-12,"month")   , order_date < date_add(utc_usec_to_month(current_date()),<parameters.offset>-1,"month")

however, bigquery returns error:

error: date_add 2nd argument must have int32 type.

when try same query in bigquery editor using simple arithmetic fails same error.

select date_add(utc_usec_to_month(current_date()),5-3,"month") month_index,   [orders]

any workaround this? option far make multiple offsets in tableau, seems.

thanks help!

i acknowledge hole in functionality of date_add. can fixed, take time until fix rolled production.


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