Re: [WIP] UNNEST(REFCURSOR): allowing SELECT to consume data from a REFCURSOR

Dent John wrote:

> It’s crashing when it’s checking that the returned tuple matches the
> declared return type in rsinfo->setDesc. Seems rsinfo->setDesc gets
> overwritten. So I think I have a memory management problem.

What is the expected result anyway? A single column with a "record"
type? FWIW I notice that with plpgsql, this is not allowed to happen:

CREATE FUNCTION cursor_unnest(x refcursor) returns setof record
as $$
declare
r record;
begin
loop
fetch x into r;
exit when not found;
return next r;
end loop;
end $$ language plpgsql;

begin;

declare c cursor for select oid::int as i, relname::text as r from pg_class;

select cursor_unnest('c');

ERROR: set-valued function called in context that cannot accept a set
CONTEXT: PL/pgSQL function cursor_unnest(refcursor) line 8 at RETURN NEXT

Best regards,
--
Daniel Vérité
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