parser: make HNSW as vector index default type

[zimulala]

What problem does this PR solve?

Issue Number: close #56428

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 @zimulala. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 7.69231% with 12 lines in your changes missing coverage. Please review.

Project coverage is 74.7868%. Comparing base (cd33d79) to head (a46d476).
Report is 3 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #56429        +/-   ##
================================================
+ Coverage   73.3833%   74.7868%   +1.4034%     
================================================
  Files          1623       1623                
  Lines        447927     449146      +1219     
================================================
+ Hits         328704     335902      +7198     
+ Misses        99078      92620      -6458     
- Partials      20145      20624       +479     

Flag	Coverage Δ
integration	29.0414% <7.6923%> (?)

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

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	52.1814% <ø> (+6.6651%)	⬆️

[ti-chi-bot]

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

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev	a46d476	link	true	/test check-dev
idc-jenkins-ci-tidb/unit-test	a46d476	link	true	/test unit-test

Full PR test history. Your PR dashboard.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-30 10:52:09.50351074 +0000 UTC m=+265684.923723745: ☑️ agreed by Defined2014.
• 2024-09-30 12:18:38.400525165 +0000 UTC m=+270873.820738176: ☑️ agreed by tangenta.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Defined2014, joey-yez, tangenta
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Needs approval from an approver in each of these files:

• pkg/parser/OWNERS [tangenta]

  Need more approvers for rest parts.

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[ti-chi-bot]

@joey-yez: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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