Обсуждение: doubts about toast_flatten_tuple_attribute/heap_form_tuple

I'm trying write tuple conversion function and now I'm hit problem with 
composite data types. Composite data types can contain inner composite 
data types. Is there any limit? And I found that heap_form_tuple calls  toast_flatten_tuple_attribute only one level
compositetype. Is it bug?
 

Thanks Zdenek

Zdenek Kotala <Zdenek.Kotala@Sun.COM> writes:
> I'm trying write tuple conversion function and now I'm hit problem with 
> composite data types. Composite data types can contain inner composite 
> data types. Is there any limit?

No.

> And I found that heap_form_tuple calls 
>   toast_flatten_tuple_attribute only one level composite type. Is it bug?

No, because any composite value that's being presented for inclusion in
the new tuple was already flattened when it was formed.
        regards, tom lane