ddl: Fix vector index for high dimensional vectors (#58717)

[ti-chi-bot]

This is an automated cherry-pick of #58717

What problem does this PR solve?

Issue Number: Close #58836

Problem Summary:

What changed and how does it work?

Fix Txn: KeyTooLong error when using vector index. It is caused by TiDB writes not only vector data but also vector keys, but TiDB shouldn't, as vector indexes are TiFlash local indexes and there is no need to write vector keys.

In this PR, the vector_long cluster integration test is just using the same test case as TestVectorLong unit test, simply run over the whole cluster to ensure everything works.

This is a cherry-pick of upstream PR: https://github.com/tidbcloud/tidb-cse/pull/1464

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

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.5@587a810). Learn more about missing BASE report.

Additional details and impacted files

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Flag	Coverage Δ
integration	36.9267% <10.5263%> (?)
unit	72.7465% <78.9473%> (?)

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

Components	Coverage Δ
dumpling	52.8711% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.2966% <0.0000%> (?)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, XuHuaiyu

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Needs approval from an approver in each of these files:

• pkg/ddl/OWNERS [tangenta]
• pkg/expression/OWNERS [XuHuaiyu]
• pkg/meta/OWNERS [tangenta]
• pkg/table/OWNERS [tangenta]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-09 11:44:00.250337406 +0000 UTC m=+440383.539169123: ☑️ agreed by tangenta.
• 2025-01-10 02:20:50.726547313 +0000 UTC m=+492994.015379015: ☑️ agreed by XuHuaiyu.

[breezewish]

/test pull-unit-test-ddlv1

[tiprow]

@breezewish: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test pull-unit-test-ddlv1

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