extension: fix some wrong code for extension test

[lcwangchao]

What problem does this PR solve?

Issue Number: ref #38788

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

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

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CbcWestwolf, hawkingrei

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• OWNERS [CbcWestwolf,hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-07-28 08:30:24.85319971 +0000 UTC m=+515967.447730700: ☑️ agreed by CbcWestwolf.
• 2023-07-28 08:32:08.475032029 +0000 UTC m=+516071.069563016: ☑️ agreed by hawkingrei.

[codecov]

Codecov Report

Merging #45656 (9a737ab) into master (ac0c90e) will decrease coverage by 0.0010%.
Report is 9 commits behind head on master.
The diff coverage is 0.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #45656        +/-   ##
================================================
- Coverage   73.2228%   73.2219%   -0.0010%     
================================================
  Files          1273       1276         +3     
  Lines        390068     390745       +677     
================================================
+ Hits         285619     286111       +492     
- Misses        86148      86287       +139     
- Partials      18301      18347        +46     

Flag	Coverage Δ
integration	78.1388% <ø> (?)
unit	73.2133% <0.0000%> (-0.0095%)	⬇️

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

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	85.0417% <ø> (-0.0109%)	⬇️
br	52.1520% <0.0000%> (+0.0021%)	⬆️