statistics: right deal with error for reading stats from storage (#58048)

[ti-chi-bot]

This is an automated cherry-pick of #58048

What problem does this PR solve?

Issue Number: ref #57901

Problem Summary:

What changed and how does it work?

if query meets the problem, it will return null error, then it lead to delete stats. it is a bug. so we can first fix this problem first.

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.

right deal with error for reading stats from storage to avoid deleting stats

正确处理取统计信息的异常，来防止 stats 被误删除

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, qw4990

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• pkg/statistics/OWNERS [hawkingrei,qw4990]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-09 04:30:07.772662673 +0000 UTC m=+239997.861465211: ☑️ agreed by hawkingrei.
• 2024-12-09 06:07:57.240603842 +0000 UTC m=+245867.329406382: ☑️ agreed by qw4990.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.1@c6e2ffa). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #58060   +/-   ##
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  Coverage               ?   71.1867%           
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  Lines                  ?     423465           
  Branches               ?          0           
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  Hits                   ?     301451           
  Misses                 ?     101491           
  Partials               ?      20523           

Flag	Coverage Δ
unit	71.1867% <57.1428%> (?)

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

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.3184% <0.0000%> (?)