statistics: remove dead code (#58412)

[ti-chi-bot]

This is an automated cherry-pick of #58412

Signed-off-by: Rustin170506 techregister@pm.me

What problem does this PR solve?

Issue Number: ref #57804

Problem Summary:

What changed and how does it work?

In this PR, I removed the dead code. The stats loading for the PK, as shown, has never been executed, so it is safe to remove.

Some background:

1. statistics: fix PK column TopN not loading when init stats #37552 This PR tried to load it correctly.
2. statistics: fix wrong behavior for primary key' non-lite init stats #53298 This PR decided to remove it at all.
3. Another fix based on the previous PR: *: not load unnecessay data during the non-lite-init-stats #53399
4. Another full rewrite: statistics: correct behavior of non-lite InitStats and stats sync load of no stats column #57803

So we just forgot to delete it.

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

[ti-chi-bot]

@Rustin170506 This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[Rustin170506]

Thanks!

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Rustin170506, winoros

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• pkg/statistics/OWNERS [Rustin170506,winoros]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-27 08:36:40.782453657 +0000 UTC m=+517748.735611923: ☑️ agreed by Rustin170506.
• 2025-02-27 11:11:41.00611918 +0000 UTC m=+527048.959277459: ☑️ agreed by winoros.

[Rustin170506]

/retest

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.5@3fbf496). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #59591   +/-   ##
================================================
  Coverage               ?   72.1649%           
================================================
  Files                  ?       1417           
  Lines                  ?     413924           
  Branches               ?          0           
================================================
  Hits                   ?     298708           
  Misses                 ?      95197           
  Partials               ?      20019           

Flag	Coverage Δ
unit	72.1649% <84.6153%> (?)

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

Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.5574% <0.0000%> (?)

[Rustin170506]

/unhold