ddl: Move placement to special comment for ddl sql in binlog

[lcwangchao]

What problem does this PR solve?

Issue Number: close #31453

Problem Summary:

Move placement to special comment for ddl sql in binlog

What is changed and how it works?

See the tests in the PR. To make a compatibility with mysql, we must move the placement options which are unsupported by mysql to special comments in binlog. Includes:

• CREATE/ALTER/DROP placement policy should move the entire statement to comment.
• ALTER DATABASE: If all options are placement options. We should move the entire statement to comment. Otherwise move the placement options to comment.
• ALTER PARTITION OPTIONS: Now only placement policies are supported, so move the entire statement to comment

Check List

Tests

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

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

Placement options are moved to special comments in binlog

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• bb7133
• xhebox

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/0059a5064a8d50ea4282745e65afea670f5765f7

[lcwangchao]

/run-mysql-test

[lcwangchao]

/run-unit-test

[bb7133]

LGTM

[xhebox]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 3362128

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