【标题】(请简要描述下实现的内容)
建表时使用not null约束
【实现内容】:
create table table_name of type_name可以直接使用not null约束或者default，兼容pg。
【根因分析】:

【修改方案】:

  1. xxx
  2. xxx

【关联issue】:
#I55D36:create table table_name of type_name 使用not null约束，建表失败
【开发自验报告】:

  1. 请附上自验结果(内容或者截图)
============== shutting down postmaster               ==============
stop postmaster now!

=======================
 All 719 tests passed.
 Total Time: 974.833746s
=======================

openGauss=# create type person_type as(id int, name text);
CREATE TYPE
openGauss=# create table person3 of person_type(primary key(id), name not null default '');
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "person3_pkey" for table "person3"
CREATE TABLE
openGauss=# create table person5 of person_type(primary key(id), name not null);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "person5_pkey" for table "person5"
CREATE TABLE
openGauss=# create table person6 of person_type(primary key(id), name default '');
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "person6_pkey" for table "person6"
CREATE TABLE
openGauss=# \d person3
    Table "public.person3"
 Column |  Type   | Modifiers
--------+---------+-----------
 id     | integer | not null
 name   | text    | not null
Indexes:
    "person3_pkey" PRIMARY KEY, btree (id) TABLESPACE pg_default
Typed table of type: person_type

openGauss=# \d person6
    Table "public.person6"
 Column |  Type   | Modifiers
--------+---------+-----------
 id     | integer | not null
 name   | text    |
Indexes:
    "person6_pkey" PRIMARY KEY, btree (id) TABLESPACE pg_default
Typed table of type: person_type

openGauss=# insert into person6 values(1);
INSERT 0 1
openGauss=# select * from person6;
 id | name
----+------
  1 |
(1 row)

openGauss=# create table person7 of person_type(primary key(id), name default 'default');
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "person7_pkey" for table "person7"
CREATE TABLE
openGauss=# insert into person7 values(1);
INSERT 0 1
openGauss=# select * from person7;
 id |  name
----+---------
  1 | default
(1 row)

openGauss=# \d person7
           Table "public.person7"
 Column |  Type   |        Modifiers
--------+---------+-------------------------
 id     | integer | not null
 name   | text    | default 'default'::text
Indexes:
    "person7_pkey" PRIMARY KEY, btree (id) TABLESPACE pg_default
Typed table of type: person_type
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