planner: correct the vector index tests

[Rustin170506]

What problem does this PR solve?

Issue Number: ref #57871

Problem Summary:

What changed and how does it work?

Split from #57872

We need to handle the DDL events here to ensure that the stats are loaded into memory. Otherwise, the stats cache entry will be deleted due to this issue: #57901.

Moreover, there are no indexes or predicate columns on this table, so analyzing this table doesn't provide any help.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 73.9378%. Comparing base (bb9096c) to head (507f3d5).
Report is 116 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58039        +/-   ##
================================================
+ Coverage   73.1711%   73.9378%   +0.7667%     
================================================
  Files          1674       1675         +1     
  Lines        461507     465668      +4161     
================================================
+ Hits         337690     344305      +6615     
+ Misses       103079     100644      -2435     
+ Partials      20738      20719        -19     

Flag	Coverage Δ
integration	43.5496% <ø> (?)
unit	72.4749% <ø> (+0.1778%)	⬆️

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	46.0404% <ø> (+0.0571%)	⬆️

[Rustin170506]

🔢 Self-check (PR reviewed by myself and ready for feedback.)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: time-and-fate, winoros

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• pkg/planner/OWNERS [time-and-fate,winoros]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-09 10:29:39.21727899 +0000 UTC m=+261569.306081533: ☑️ agreed by time-and-fate.
• 2024-12-09 16:23:02.484137115 +0000 UTC m=+282772.572939655: ☑️ agreed by winoros.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #58458.