statistics: fix bad lower bound and upper bound when to dump stats into json

[hawkingrei]

What problem does this PR solve?

Issue Number: close #56083

Problem Summary:

What changed and how does it work?

We will reuse the memory when to create stats. so we need to copy memory into JsonTbl. but we forget to copy.so it lead to break lower bound and upper bound.

pkg/statistics/handle/storage/json.go:91 (it will try to reuse the memory)-> GenJSONTableFromStats -> dumpJSONCol -> HistogramToProto (it forget to copy 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.

 fix bad lower bound and upper bound when to dump stats into json

修复在dump stats转json过程中，导致 hist 上下界数据受损的问题 

[hawkingrei]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.7383%. Comparing base (8832684) to head (70cda9a).
Report is 5 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57314        +/-   ##
================================================
+ Coverage   72.8973%   73.7383%   +0.8409%     
================================================
  Files          1672       1702        +30     
  Lines        461745     470122      +8377     
================================================
+ Hits         336600     346660     +10060     
+ Misses       104426     102140      -2286     
- Partials      20719      21322       +603     

Flag	Coverage Δ
integration	46.2096% <100.0000%> (?)
unit	72.3302% <100.0000%> (+0.0582%)	⬆️

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

Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	45.1563% <ø> (+0.0214%)	⬆️

[hawkingrei]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [AilinKid,winoros]
• pkg/statistics/OWNERS [AilinKid,winoros]

Approvers can indicate their approval by writing /approve in a comment
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-13 08:08:29.598967335 +0000 UTC m=+430071.789836327: ☑️ agreed by winoros.
• 2024-11-13 08:28:20.611609762 +0000 UTC m=+431262.802478755: ☑️ agreed by AilinKid.

[hawkingrei]

/retest

[hawkingrei]

/hold

[hawkingrei]

/unhold

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #57363.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #57364.