statistics: fix wrong behavior for primary key' non-lite init stats (#53298)

[ti-chi-bot]

This is an automated cherry-pick of #53298

What problem does this PR solve?

Issue Number: ref #37548

Problem Summary:

What changed and how does it work?

primary key's is_index is false. so it cannot load the topn. it's stats cannon be set as AllFull.

Check List

Tests

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

according to #37548, it's result is right.

• 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

[hawkingrei]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.1@d140d7b). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #54204   +/-   ##
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  Coverage               ?   73.4620%           
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  Files                  ?       1211           
  Lines                  ?     380428           
  Branches               ?          0           
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  Hits                   ?     279470           
  Misses                 ?      83115           
  Partials               ?      17843           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-29 03:42:39.535271695 +0000 UTC m=+1014554.669721814: ☑️ agreed by hawkingrei.
• 2024-08-29 05:07:42.016318428 +0000 UTC m=+1019657.150768572: ☑️ agreed by AilinKid.