ddl: enable the ddl notifier by default

[Rustin170506]

What problem does this PR solve?

Issue Number: ref #55722

Problem Summary:

What changed and how does it work?

Enable the DDL notifier by default.
I added the DDLNotifierTableVersion to init the DDL notifier table.

Check List

Tests

• Unit test
• Integration test
• Manual test See: ddl: enable the ddl notifier by default #56864 (comment)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[codecov]

Codecov Report

Attention: Patch coverage is 75.67568% with 9 lines in your changes missing coverage. Please review.

Project coverage is 57.2836%. Comparing base (c550aae) to head (d2a718b).
Report is 8 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56864         +/-   ##
=================================================
- Coverage   73.3393%   57.2836%   -16.0558%     
=================================================
  Files          1636       1791        +155     
  Lines        453658     641845     +188187     
=================================================
+ Hits         332710     367672      +34962     
- Misses       100561     249028     +148467     
- Partials      20387      25145       +4758     

Flag	Coverage Δ
integration	39.5924% <67.5675%> (?)
unit	72.7377% <75.6756%> (+0.1860%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	63.2030% <ø> (+17.2263%)	⬆️

[Rustin170506]

🔢 Self-check (PR reviewed by myself and ready for feedback.)

[Rustin170506]

Tested locally:

1. Create the TiDB cluster: tiup playground v8.2.0 --db.binpath /Users/rustin/code/tidb/bin/tidb-server
2. Check the table:

mysql> use test
Database changed
mysql> select * from mysql.tidb_ddl_notifier;
Empty set (0.00 sec)

3. Create a new table and check it again:

mysql> create table a(a int);
Query OK, 0 rows affected (0.02 sec)

mysql> select * from mysql.tidb_ddl_notifier;
Empty set (0.00 sec)

mysql> ALTER TABLE a ADD INDEX index_name (a);
Query OK, 0 rows affected (0.10 sec)

mysql> select * from mysql.tidb_ddl_notifier;
Empty set (0.00 sec)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fzzf678, lance6716

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Needs approval from an approver in each of these files:

• OWNERS [lance6716]
• pkg/ddl/OWNERS [lance6716]
• pkg/domain/OWNERS [lance6716]
• pkg/meta/OWNERS [lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-28 09:32:13.618562314 +0000 UTC m=+255846.457717853: ☑️ agreed by lance6716.
• 2024-10-28 10:06:06.000094477 +0000 UTC m=+257878.839250039: ☑️ agreed by fzzf678.

[Rustin170506]

/retest