ddl: support pre-split index regions before creating index

[tangenta]

What problem does this PR solve?

Issue Number: close #57552, close #57551

Problem Summary:

What changed and how does it work?

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 @tangenta. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 25.18519% with 303 lines in your changes missing coverage. Please review.

Project coverage is 74.6266%. Comparing base (fe1b9ed) to head (abd295c).
Report is 13 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57553        +/-   ##
================================================
+ Coverage   72.8112%   74.6266%   +1.8153%     
================================================
  Files          1676       1724        +48     
  Lines        463677     474170     +10493     
================================================
+ Hits         337609     353857     +16248     
+ Misses       105228      98094      -7134     
- Partials      20840      22219      +1379     

Flag	Coverage Δ
integration	49.0965% <17.0940%> (?)
unit	72.1565% <25.1851%> (-0.0556%)	⬇️

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

Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	60.6250% <ø> (+15.1660%)	⬆️

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• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles

[ti-chi-bot]

@tangenta: 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
pull-br-integration-test	c96e2e3	link	true	/test pull-br-integration-test

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: D3Hunter
Once this PR has been reviewed and has the lgtm label, please ask for approval from tangenta and additionally assign bb7133, bornchanger, d3hunter, yudongusa for approval(Please ensuring that each of them provides their approval before proceeding). For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS [D3Hunter]
• pkg/ddl/OWNERS [D3Hunter]
• pkg/meta/OWNERS [D3Hunter]
• pkg/parser/OWNERS [D3Hunter]

  Need more approvers for rest parts.

Approvers can indicate their approval by writing /approve in a comment
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-25 08:21:19.905921193 +0000 UTC m=+451867.525575708: ☑️ agreed by D3Hunter.