br: reduce workload in unit test

[Leavrth]

What problem does this PR solve?

Issue Number: ref #48301

Problem Summary:
the unit test has a heavy workload

What changed and how does it work?

reduce the number of tables to be created.

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.

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

[tiprow]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-05 04:13:54.185022848 +0000 UTC m=+140461.207269236: ☑️ agreed by 3pointer.
• 2024-03-05 05:04:51.255154065 +0000 UTC m=+143518.277400448: ☑️ agreed by hawkingrei.

[codecov]

Codecov Report

Merging #51493 (070ac4d) into master (ac057eb) will increase coverage by 1.9426%.
Report is 10 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51493        +/-   ##
================================================
+ Coverage   70.7350%   72.6777%   +1.9426%     
================================================
  Files          1462       1462                
  Lines        435268     436530      +1262     
================================================
+ Hits         307887     317260      +9373     
+ Misses       108112      99310      -8802     
- Partials      19269      19960       +691     

Flag	Coverage Δ
integration	48.7923% <ø> (?)
unit	70.4657% <ø> (-0.0715%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	50.8477% <ø> (+4.9857%)	⬆️

[hawkingrei]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #51518.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #51519.