Define recursive composite types

Is it possible to define recursive composite types in Postgres 13?

create type "t" as (
  "a" int,
  "b" t
);

I am aware that I can use a table with a parent-child relationship. The only disadvantage is that I will need to query each nested level instead of directly accessing the nested data.

I am also aware that I can use jsonb, but I am not sure if it can access the nested data directly without querying each nested level?

What are the other alternatives using PL/pgSQL only?

I need to access each nested level separately.

Asked by user1192 (301 )
May 15, 2021 at 20:58