*: remove the variable txn_scope

[ekexium]

What problem does this PR solve?

Issue Number: ref #58838

Problem Summary:

What changed and how does it work?

Remove the variable txn_scope

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]

Hi @ekexium. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.1141%. Comparing base (b22555b) to head (3e8e5c0).
Report is 17 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58839        +/-   ##
================================================
+ Coverage   73.1419%   75.1141%   +1.9722%     
================================================
  Files          1677       1723        +46     
  Lines        463823     474282     +10459     
================================================
+ Hits         339249     356253     +17004     
+ Misses       103716      95804      -7912     
- Partials      20858      22225      +1367     

Flag	Coverage Δ
integration	48.9844% <ø> (?)
unit	72.4802% <ø> (+0.1390%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	61.6494% <ø> (+15.9313%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-13 02:04:24.643833377 +0000 UTC m=+751207.932665083: ☑️ agreed by cfzjywxk.
• 2025-01-13 03:43:25.289604243 +0000 UTC m=+757148.578435947: ☑️ agreed by crazycs520.

[ekexium]

/retest

[tiprow]

@ekexium: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/retest

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[hawkingrei]

/ok-to-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: cfzjywxk, crazycs520, joey-yez, tangenta
Once this PR has been reviewed and has the lgtm label, please assign xuhuaiyu, yudongusa for approval, ensuring that each of them provides their approval before proceeding. For more information see the Code Review Process.

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Needs approval from an approver in each of these files:

• OWNERS [cfzjywxk,crazycs520,tangenta]
• pkg/ddl/OWNERS [tangenta]
• pkg/expression/OWNERS
• pkg/sessionctx/variable/OWNERS

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[ti-chi-bot]

@joey-yez: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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