create table a(i int);
insert into a values (1);

create table a1() inherits(a);
insert into a1 values (1);

-- Only the parent table is copied, as the documentation claims.
copy a to stdout;

alter table a enable row level security;
create role u;
create policy pol_perm on a as permissive for select to u using (true);
grant select on table a to u;
set role u;

-- Both "a" and "a1" appears in the output.
copy a to stdout;