variable: fix information_schema.VARIABLES_INFO DEFAULT_VALUE not right problem (#49524)

[ti-chi-bot]

This is an automated cherry-pick of #49524

What problem does this PR solve?

Issue Number: close #49461, close #49968, close #50155

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Without this pr, deploy a cluster:

mysql> select VARIABLE_NAME, VARIABLE_SCOPE, DEFAULT_VALUE, CURRENT_VALUE from information_schema.VARIABLES_INFO where DEFAULT_VALUE != CURRENT_VALUE and variable_name in ('tidb_txn_mode', 'tidb_enable_async_commit','tidb_enable_1pc', 'tidb_mem_oom_action', 'tidb_enable_auto_analyze', 'tidb_row_format_version', 'tidb_txn_assertion_level', 'tidb_enable_mutation_checker', 'tidb_pessimistic_txn_fair_locking');
+-----------------------------------+----------------+---------------+---------------+
| VARIABLE_NAME                     | VARIABLE_SCOPE | DEFAULT_VALUE | CURRENT_VALUE |
+-----------------------------------+----------------+---------------+---------------+
| tidb_row_format_version           | SESSION,GLOBAL | 1             | 2             |
| tidb_pessimistic_txn_fair_locking | SESSION,GLOBAL | OFF           | ON            |
| tidb_enable_async_commit          | SESSION,GLOBAL | OFF           | ON            |
| tidb_enable_mutation_checker      | SESSION,GLOBAL | OFF           | ON            |
| tidb_txn_mode                     | SESSION,GLOBAL |               | pessimistic   |
| tidb_txn_assertion_level          | SESSION,GLOBAL | OFF           | FAST          |
| tidb_enable_1pc                   | SESSION,GLOBAL | OFF           | ON            |
+-----------------------------------+----------------+---------------+---------------+
7 rows in set (0.07 sec)

With this pr:

mysql> select VARIABLE_NAME, VARIABLE_SCOPE, DEFAULT_VALUE, CURRENT_VALUE from information_schema.VARIABLES_INFO where DEFAULT_VALUE != CURRENT_VALUE and variable_name in ('tidb_txn_mode', 'tidb_enable_async_commit','tidb_enable_1pc', 'tidb_mem_oom_action', 'tidb_enable_auto_analyze', 'tidb_row_format_version', 'tidb_txn_assertion_level', 'tidb_enable_mutation_checker', 'tidb_pessimistic_txn_fair_locking');
Empty set (0.01 sec)


mysql> select VARIABLE_NAME, VARIABLE_SCOPE, DEFAULT_VALUE, CURRENT_VALUE from information_schema.VARIABLES_INFO where variable_name in ('tidb_txn_mode', 'tidb_enable_async_commit','tidb_enable_1pc', 'tidb_mem_oom_action', 'tidb_enable_auto_analyze', 'tidb_row_format_version', 'tidb_txn_assertion_level', 'tidb_enable_mutation_checker', 'tidb_pessimistic_txn_fair_locking');
+-----------------------------------+----------------+---------------+---------------+
| VARIABLE_NAME                     | VARIABLE_SCOPE | DEFAULT_VALUE | CURRENT_VALUE |
+-----------------------------------+----------------+---------------+---------------+
| tidb_mem_oom_action               | GLOBAL         | CANCEL        | CANCEL        |
| tidb_enable_1pc                   | SESSION,GLOBAL | ON            | ON            |
| tidb_enable_async_commit          | SESSION,GLOBAL | ON            | ON            |
| tidb_enable_auto_analyze          | GLOBAL         | ON            | ON            |
| tidb_row_format_version           | SESSION,GLOBAL | 2             | 2             |
| tidb_txn_mode                     | SESSION,GLOBAL | pessimistic   | pessimistic   |
| tidb_pessimistic_txn_fair_locking | SESSION,GLOBAL | ON            | ON            |
| tidb_txn_assertion_level          | SESSION,GLOBAL | FAST          | FAST          |
| tidb_enable_mutation_checker      | SESSION,GLOBAL | ON            | ON            |
+-----------------------------------+----------------+---------------+---------------+
9 rows in set (0.01 sec)

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.

fix the behavior to show the right default value for some variables

[ti-chi-bot]

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/build	e32922c	link	true	/test build
idc-jenkins-ci-tidb/check_dev	e32922c	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	e32922c	link	true	/test check-dev2
idc-jenkins-ci-tidb/mysql-test	e32922c	link	true	/test mysql-test
idc-jenkins-ci-tidb/unit-test	e32922c	link	true	/test unit-test

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