BUG #17464: Domain type. If the value field(CREATE DOMAIN) is set to null, errors cannot be intercepted.

The following bug has been logged on the website:

Bug reference:      17464
Logged by:          Domain type. If the value field(CREATE DOMAIN) is set to null, errors cannot
be intercepted.
Email address:      dafoer_x@163.com
PostgreSQL version: 13.2
Operating system:   centos7.6 x86
Description:

Domain type. If the value field(CREATE DOMAIN) is set to null, errors cannot
be intercepted.
Because texteq cannot accept null input parameters,
op->d.domainCheck.checknull is set to the wrong value .

detail:
postgres=# call f3_basic('男');
NOTICE:  a_xb = 男
CALL
postgres=# call  f3_basic('她');
NOTICE:  a_xb = 她
CALL


eg.
drop domain xb;
CREATE DOMAIN xb AS TEXT CHECK
(
   VALUE = '男'
   OR VALUE ='女'
   OR VALUE = null
 );
drop procedure if exists f3_basic(a_xb xb);
CREATE OR REPLACE procedure f3_basic (a_xb xb)  AS
$$
BEGIN
 RAISE NOTICE 'a_xb = %',a_xb;
END;
$$
LANGUAGE PLPGSQL;
-- success
call f3_basic('男');
-- expected error
call  f3_basic('她');
drop procedure if exists f3_basic(a_xb xb);
drop domain xb;