planner: make pkg integration tests ignore plan-id with explain format as brief

[lostcache]

What problem does this PR solve?

Issue Number: ref #60940

Problem Summary: Some explain-test cases will record the plan ID in the result file, which will be a burden when some optimization flow is changed, since plan ID allocation is sequential according to the allocation order or space.

What changed and how does it work?

Made pkg integration tests ignore plan-id with explain format as brief

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

[ti-chi-bot]

Hi @lostcache. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[tiprow]

Hi @lostcache. Thanks for your PR.

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[lance6716]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.6667%. Comparing base (38fdd1b) to head (7e260cb).
⚠️ Report is 12 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65990        +/-   ##
================================================
- Coverage   77.7655%   77.6667%   -0.0989%     
================================================
  Files          2001       1923        -78     
  Lines        545901     537369      -8532     
================================================
- Hits         424523     417357      -7166     
- Misses       119716     120004       +288     
+ Partials       1662          8      -1654     

Flag	Coverage Δ
integration	41.9097% <ø> (-6.2538%)	⬇️
unit	76.8909% <ø> (+0.4973%)	⬆️

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

Components	Coverage Δ
dumpling	56.7974% <ø> (ø)
parser	∅ <ø> (∅)
br	48.8888% <ø> (-12.0949%)	⬇️

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[terry1purcell]

/retest-required

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: terry1purcell, winoros

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Details

Needs approval from an approver in each of these files:

• pkg/planner/OWNERS [terry1purcell,winoros]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-02-03 14:32:30.009153967 +0000 UTC m=+191021.110552689: ☑️ agreed by terry1purcell.
• 2026-02-03 14:36:22.698809172 +0000 UTC m=+191253.800207893: ☑️ agreed by winoros.