Snowflake SQL UDF - Unsupported Subquery Error

Question

I am creating a Snowflake SQL UDF. I keep running into SQL compilation error: Unsupported subquery type cannot be evaluated. I have tried to do several things to go around the issue, this being my latest try.

How can I make this break out of the subquery'ing error?

The UDF should allow one to input their preferred year. Thinking to create a solution by if a year is not provided, the default would be the present year.

create or replace function new_value(PRICE float, TYPE varchar, YR_CREATED int, YEAR int)

returns float

as
$$

 
with AGE_OF_PRODUCT as (
    select any_value((YEAR - YR_CREATED)) as AGE ),



  FORMULA as (
    select any_value(AGE) as AGE,
    any_value(case
        when AGE <= 1 then 1
        else 2
    end) as FUNCTION
    from AGE_OF_PRODUCT

  )
  
  select
     any_value(case
        when F.FUNCTION = 1 then (PRICE - (PRICE * R.R1))
        else (PRICE * (1 - (R.R1))) * pow((1-(R.R2)), ((F.AGE - YR_CREATED)-1))
    end) as VALUE
  from FORMULA as F, RATES as R
  where TYPE = R.TYPE_OF_PRODUCT

  
                                      
$$;

Answer 1

So the main problem is you are likely using the function like:

select v.*,
    new_value(v.price, v.type, v.yr_create, v.year) as awesome
from table_with_values as v

also your UDF can be rewritten as it stands as:

create or replace function new_value(
    PRICE float, 
    TYPE varchar, 
    YR_CREATED int, 
    YEAR int)
returns float
as
$$

    select
        YEAR - YR_CREATED as age,
        case age <= 1
            when true then (PRICE - (PRICE * r.r1))
            else (PRICE * (1 - (r.r1))) * pow((1-(r.r2)), ((age - YR_CREATED)-1))
        end as value
    from rates as r
    where TYPE = r.type_of_product
                      
$$;

but if we move the join to rates outside the UDF

create or replace function new_value(
    PRICE float, 
    YR_CREATED int, 
    YEAR int,
    rate1 float,
    rate2 float)
returns float
as
$$
    select
        case (YEAR - YR_CREATED) <= 1
            when true then (PRICE - (PRICE * r.r1))
            else (PRICE * (1 - (rate1))) * pow((1-(rate2)), (((YEAR - YR_CREATED) - YR_CREATED)-1))
        end as value;                     
$$;

then we can call it like:

select v.*,
    new_value(v.price, v.yr_create, v.year, r.r1, r.r2) as awesome
from table_with_values as v
join rates as r 
    on v.type = r.type_of_product