Fix commands are filtered without no post_exec to catch

[CalvinNeo]

Signed-off-by: CalvinNeo calvinneo1995@gmail.com

What problem does this PR solve?

Issue Number: close tiflash#5445

Problem Summary:

The problem is when a command is filtered by pre_exec, it should also be replicated to TiFlash to push forward apply index. A post_exec will do so, however, it has not been merged yet, so we use a workaround for this.

What is changed and how it works?

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

None