variable: fix data race in GetTemporaryTable

[lcwangchao]

What problem does this PR solve?

Issue Number: close #55337

What changed and how does it work?

fix data race for TxnCtx.GetTemporaryTable

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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[easonn7]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: djshow832, easonn7, tiancaiamao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-09 13:53:23.680075395 +0000 UTC m=+619333.547174480: ☑️ agreed by tiancaiamao.
• 2024-08-09 13:58:51.686831842 +0000 UTC m=+619661.553930930: ☑️ agreed by djshow832.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.9780%. Comparing base (240702e) to head (80fc056).
Report is 1 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55338        +/-   ##
================================================
+ Coverage   72.8938%   73.9780%   +1.0841%     
================================================
  Files          1571       1571                
  Lines        439731     439771        +40     
================================================
+ Hits         320537     325334      +4797     
+ Misses        99471      94535      -4936     
- Partials      19723      19902       +179     

Flag	Coverage Δ
integration	46.3401% <100.0000%> (?)
unit	71.7915% <100.0000%> (-0.1386%)	⬇️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	46.1492% <ø> (+0.2704%)	⬆️

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #55339.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #55340.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #55341.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #55342.