statistics: fix some problem related to stats async load (#57723)

[ti-chi-bot]

This is an automated cherry-pick of #57723

What problem does this PR solve?

Issue Number: close #57722, close #57735

Problem Summary:

What changed and how does it work?

Version0 means that column stats is not created via the ANALYZE command. We should not use it to update the Last Analyze Timestamp.

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.

修复没有收集过统计信息的表的上次 ANALYZE 时间可能不为 NULL 的问题
Fix the issue that an unanalyzed table's last analyze time may not be NULL.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-03 11:56:46.135032958 +0000 UTC m=+1155993.754687473: ☑️ agreed by time-and-fate.
• 2024-12-03 12:56:48.431447534 +0000 UTC m=+1159596.051102044: ☑️ agreed by winoros.

[codecov]

Codecov Report

Attention: Patch coverage is 80.95238% with 8 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.1@e2da796). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #57774   +/-   ##
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  Coverage               ?   71.1892%           
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  Hits                   ?     301423           
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  Partials               ?      20520           

Flag	Coverage Δ
unit	71.1892% <80.9523%> (?)

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	41.2954% <0.0000%> (?)