> them in the order they are currently stored in that variable. So take
> 
> for example this foreign application variable:
> 
>    ids = "3,2,5,1,4"


kludgy, but:

1. store your ids in a pg array
2. select from the array
3. on order by, write a function that takes the row.id and array as
parameters, returning the id offset into the array



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