statistics: fix the error that init stats might got failure when decoding column bucket (#55685)

[ti-chi-bot]

This is an automated cherry-pick of #55685

…

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

[fixdb]

please fix conflict

[fixdb]

+1

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-25 04:49:51.849618492 +0000 UTC m=+1627861.590042426: ☑️ agreed by fixdb.
• 2024-09-25 07:32:15.969881443 +0000 UTC m=+1637605.710305382: ☑️ agreed by Rustin170506.

[codecov]

Codecov Report

Attention: Patch coverage is 31.25000% with 22 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.5@5665343). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #56026   +/-   ##
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  Coverage               ?   72.0016%           
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  Files                  ?       1414           
  Lines                  ?     412345           
  Branches               ?          0           
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  Hits                   ?     296895           
  Misses                 ?      95550           
  Partials               ?      19900           

Flag	Coverage Δ
unit	72.0016% <31.2500%> (?)

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	53.5454% <0.0000%> (?)