br: reduce memory usage when get incomplete ranges

[Leavrth]

What problem does this PR solve?

Issue Number: close #53529

Problem Summary:
it preallocates too much items and uses too much memory.

What changed and how does it work?

reduce the number of preallocated items

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 @Leavrth. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.0464%. Comparing base (b522e98) to head (82ad6cd).
Report is 49 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #57192         +/-   ##
=================================================
- Coverage   73.0639%   58.0464%   -15.0175%     
=================================================
  Files          1659       1822        +163     
  Lines        458021     656531     +198510     
=================================================
+ Hits         334648     381093      +46445     
- Misses       102834     250190     +147356     
- Partials      20539      25248       +4709     

Flag	Coverage Δ
integration	40.0598% <100.0000%> (?)
unit	73.3062% <100.0000%> (+0.9655%)	⬆️

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

Components	Coverage Δ
dumpling	55.2602% <ø> (+2.3124%)	⬆️
parser	∅ <ø> (∅)
br	64.4899% <100.0000%> (+18.7823%)	⬆️

[BornChanger]

/retest

[tiprow]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, YuJuncen

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• br/OWNERS [3pointer,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-11 03:10:03.81029536 +0000 UTC m=+239366.001164356: ☑️ agreed by 3pointer.
• 2024-11-11 03:11:17.912841498 +0000 UTC m=+239440.103710491: ☑️ agreed by YuJuncen.

[Leavrth]

/retest

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[Leavrth]

/retest

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[Leavrth]

/retest

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

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[purelind]

/test all

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[Leavrth]

/ok-to-test

[tiprow]

@Leavrth: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	82ad6cd	link	true	/test fast_test_tiprow

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #57342.