ddl: refine range validation after scaning regions

[tangenta]

What problem does this PR solve?

Issue Number: close #59701

Problem Summary:

If there is no leader in the first/last few regions, it can pass the check from validateAndFillRanges, which is not expected.

What changed and how does it work?

• Add a check for the first & last range.
• Add split region error into the reorg retryable error list.

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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.8660%. Comparing base (a95824d) to head (0a828e9).
Report is 20 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59767        +/-   ##
================================================
+ Coverage   72.9579%   74.8660%   +1.9081%     
================================================
  Files          1697       1745        +48     
  Lines        468958     481595     +12637     
================================================
+ Hits         342142     360551     +18409     
+ Misses       105741      98321      -7420     
- Partials      21075      22723      +1648     

Flag	Coverage Δ
integration	48.8460% <12.5000%> (?)
unit	72.1556% <100.0000%> (-0.0125%)	⬇️

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	61.3309% <ø> (+16.2258%)	⬆️

[tangenta]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-27 03:06:51.531661637 +0000 UTC m=+497959.484819902: ☑️ agreed by zimulala.
• 2025-02-27 03:57:03.015797652 +0000 UTC m=+500970.968955919: ☑️ agreed by D3Hunter.

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, D3Hunter, wjhuang2016, zimulala

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• OWNERS [Benjamin2037,D3Hunter,wjhuang2016,zimulala]
• pkg/ddl/OWNERS [Benjamin2037,D3Hunter,wjhuang2016]

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[Benjamin2037]

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[tangenta]

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[tangenta]

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[tangenta]

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[tangenta]

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