statstics: forcely use index to order when to init stats

[hawkingrei]

What problem does this PR solve?

Issue Number: close #52466

Problem Summary:

What changed and how does it work?

forcely use index to order when to init stats

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

before:

You will see that sort will be executed in the tidb.

after:

• 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

Merging #52462 (40aff17) into master (312b69f) will increase coverage by 0.7093%.
The diff coverage is 33.3333%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #52462        +/-   ##
================================================
+ Coverage   72.1347%   72.8441%   +0.7093%     
================================================
  Files          1467       1467                
  Lines        426991     426991                
================================================
+ Hits         308009     311038      +3029     
+ Misses        99736      96578      -3158     
- Partials      19246      19375       +129     

Flag	Coverage Δ
integration	24.1483% <33.3333%> (?)

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	41.4409% <ø> (+0.3457%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hi-rustin, winoros

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

The pull request process is described here

Needs approval from an approver in each of these files:

• pkg/statistics/OWNERS [hi-rustin,winoros]

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

[LGTM Timeline notifier]

Timeline:

• 2024-04-10 11:16:41.961696446 +0000 UTC m=+1047463.489236995: ☑️ agreed by winoros.
• 2024-04-11 06:17:00.206153059 +0000 UTC m=+1115881.733693639: ☑️ agreed by hi-rustin.

[hawkingrei]

/cherrypick release-7.5
/cherrypick release-8.1

[ti-chi-bot]

@hawkingrei: new pull request created to branch release-7.5: #52507.

In response to this:

/cherrypick release-7.5
/cherrypick release-8.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

@hawkingrei: new pull request created to branch release-8.1: #52508.

In response to this:

/cherrypick release-7.5
/cherrypick release-8.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.