*: tiny cleanup LogSlowQuery

[zimulala]

What problem does this PR solve?

Issue Number: close #62988

Problem Summary:

What changed and how does it work?

• Remove several SlowQueryLogItems fields that get their values directly from sessVars
• Remove GetEncodedPlan

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 @zimulala. Thanks for your PR.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.3214%. Comparing base (b529ae5) to head (23a03c1).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #62989        +/-   ##
================================================
+ Coverage   72.7928%   73.3214%   +0.5285%     
================================================
  Files          1796       1801         +5     
  Lines        487916     494026      +6110     
================================================
+ Hits         355168     362227      +7059     
+ Misses       111114     109937      -1177     
- Partials      21634      21862       +228     

Flag	Coverage Δ
integration	42.2476% <85.0000%> (?)
unit	72.1648% <100.0000%> (-0.0123%)	⬇️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	46.3450% <ø> (+0.0367%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-08-14 07:58:42.98661893 +0000 UTC m=+513522.021202168: ☑️ agreed by hawkingrei.

[zimulala]

/retest

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[zimulala]

/retest

[tiprow]

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

In response to this:

/retest

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