doubts about toast_flatten_tuple_attribute/heap_form_tuple

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