planner: Fix load stats failure when stats file contains with null

[King-Dylan]

What problem does this PR solve?

Issue Number: close #53966

Problem Summary:
Fix load stats failure when stats file contains with null

What changed and how does it work?

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

[ti-chi-bot]

Hi @King-Dylan. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[tiprow]

Hi @King-Dylan. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[AilinKid]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.9392%. Comparing base (1521bf7) to head (f325154).
Report is 329 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57818        +/-   ##
================================================
+ Coverage   73.1843%   75.9392%   +2.7548%     
================================================
  Files          1674       1716        +42     
  Lines        461690     497881     +36191     
================================================
+ Hits         337885     378087     +40202     
+ Misses       103042      98569      -4473     
- Partials      20763      21225       +462     

Flag	Coverage Δ
integration	48.2465% <0.0000%> (?)
unit	74.7230% <100.0000%> (+2.4115%)	⬆️

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

Components	Coverage Δ
dumpling	53.0100% <ø> (+0.3190%)	⬆️
parser	∅ <ø> (∅)
br	46.5090% <ø> (+0.5196%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-04 06:49:57.64657279 +0000 UTC m=+1223985.266227301: ☑️ agreed by hawkingrei.
• 2024-12-04 17:54:29.020809099 +0000 UTC m=+1263856.640463614: ☑️ agreed by winoros.

[winoros]

/hold

[King-Dylan]

/retest

[hawkingrei]

/unhold

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [AilinKid,hawkingrei,winoros]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #59173.