br: fix table filter nil pointer issue

[Tristan1900]

What problem does this PR solve?

Issue Number: close #61226

Problem Summary:

What changed and how does it work?

Need to take into account of multiple segments of PiTR.

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]

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[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 75.0991%. Comparing base (802eb47) to head (ae4020e).
Report is 17 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61225        +/-   ##
================================================
+ Coverage   73.1437%   75.0991%   +1.9554%     
================================================
  Files          1726       1726                
  Lines        478033     483193      +5160     
================================================
+ Hits         349651     362874     +13223     
+ Misses       106948      98188      -8760     
- Partials      21434      22131       +697     

Flag	Coverage Δ
integration	46.3903% <70.0000%> (?)
unit	72.6291% <0.0000%> (+0.2423%)	⬆️

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Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	63.5104% <70.0000%> (+15.9462%)	⬆️

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[wuhuizuo]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456.

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Tests

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📖 For more info, you can check the "Contribute Code" section in the development guide.

@Tristan1900 Are these tests stable and can pass in local? Please check the check list in PR description.

[wuhuizuo]

/cc @BornChanger

[Tristan1900]

@wuhuizuo yes, these can be passed local and on CI stably, but accidentally commented out during merge yesterday

[Tristan1900]

/hold
might piggyback some fixes using this PR

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, Leavrth

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-05-22 10:47:37.366901812 +0000 UTC m=+89361.783961375: ☑️ agreed by Leavrth.
• 2025-05-22 11:57:48.185515901 +0000 UTC m=+93572.602575461: ☑️ agreed by BornChanger.

[Tristan1900]

/unhold