executor: update auto_increment position when executing "show create table"

[zimulala]

What problem does this PR solve?

create table show_auto_increment (id int key auto_increment) comment 'xxx', auto_increment=4;
show create table show_auto_increment;

Before this PR:

+---------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table               | Create Table                                                                                                                                                                                 |
+---------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| show_auto_increment | CREATE TABLE `show_auto_increment` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin AUTO_INCREMENT=4 COMMENT='xxx' |
+---------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

After this PR:

+---------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table               | Create Table                                                                                                                                                                                 |
+---------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| show_auto_increment | CREATE TABLE `show_auto_increment` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin COMMENT='xxx' |
+---------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

What is changed and how it works?

Update auto_increment position in ShowExec.

Check List

Tests

• Unit test

[sre-bot]

Thanks for your PR.
This PR will be closed by bot because you already had 2 opened PRs, close or merge them before submitting a new one.
#11625 , #11739