Re: not null constraints, again

CREATE TABLE a (aa TEXT);
CREATE TEMP TABLE z (b TEXT, UNIQUE(aa, b)) inherits (a);

\d+ z
Table "pg_temp_0.z"
Column | Type | Collation | Nullable | Default | Storage |
Compression | Stats target | Description
--------+------+-----------+----------+---------+----------+-------------+--------------+-------------
aa | text | | not null | | extended |
| |
b | text | | | | extended |
| |
Indexes:
"z_aa_b_key" UNIQUE CONSTRAINT, btree (aa, b)
Not-null constraints:
"z_aa_not_null" NOT NULL "aa"
Inherits: a
Access method: heap

that means in transformIndexConstraint,
the following part only apply to CONSTR_PRIMARY

if (strcmp(key, inhname) == 0)
{
found = true;
typid = inhattr->atttypid;
cxt->nnconstraints =
lappend(cxt->nnconstraints,

makeNotNullConstraint(makeString(pstrdup(inhname))));
break;
}