statistics: fix the error that init stats might got failure when decoding column bucket

[winoros]

…

What problem does this PR solve?

Issue Number: close #55684

Problem Summary:

What changed and how does it work?

The old init stats doesn't handle the collation string.

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

Attention: Patch coverage is 18.75000% with 26 lines in your changes missing coverage. Please review.

Project coverage is 59.4504%. Comparing base (290dc46) to head (c12dcd4).
Report is 115 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #55685         +/-   ##
=================================================
- Coverage   72.9295%   59.4504%   -13.4792%     
=================================================
  Files          1581       1761        +180     
  Lines        442365     662905     +220540     
=================================================
+ Hits         322615     394100      +71485     
- Misses        99938     244752     +144814     
- Partials      19812      24053       +4241     

Flag	Coverage Δ
integration	41.8544% <0.0000%> (?)
unit	75.0657% <18.7500%> (+3.0656%)	⬆️

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

Components	Coverage Δ
dumpling	54.5253% <ø> (+1.5686%)	⬆️
parser	∅ <ø> (∅)
br	54.1246% <ø> (+8.6697%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• pkg/statistics/OWNERS [hawkingrei,time-and-fate]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-27 08:06:16.969055407 +0000 UTC m=+857572.103505528: ☑️ agreed by hawkingrei.
• 2024-08-27 11:21:13.683312832 +0000 UTC m=+869268.817762950: ☑️ agreed by time-and-fate.

[winoros]

/retest

[winoros]

/retest

[hawkingrei]

/check-issue-triage-complete

[winoros]

/retest

[winoros]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #56024.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #56025.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #56026.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #56027.