Dump-restore loosing 'attnotnull' bit for DEFERRABLE PRIMARY KEY column(s).

Hi,

On the latest master head, I can see a $subject bug that seems to be related
commit #b0e96f311985:

Here is the table definition:
create table foo(i int, j int, CONSTRAINT pk PRIMARY KEY(i) DEFERRABLE);

And after restore from the dump, it shows a descriptor where column 'i' not
marked NOT NULL:

=# \d foo
Table "public.foo"
Column | Type | Collation | Nullable | Default
--------+---------+-----------+----------+---------
i | integer | | |
j | integer | | |
Indexes:
"pk" PRIMARY KEY, btree (i) DEFERRABLE

The pg_attribute entry:

=# select attname, attnotnull from pg_attribute
where attrelid = 'foo'::regclass and attnum > 0;

attname | attnotnull
---------+------------
i | f
j | f
(2 rows)

--
Regards,
Amul Sul
EDB: http://www.enterprisedb.com