statistics: skip create pseudo stats for partitions

[Rustin170506]

What problem does this PR solve?

Issue Number: close #50100

Problem Summary:

What changed and how does it work?

This PR is a follow-up PR of #50099

We should also consider the partitions. We don't need to create pseudo stats here to waste time and memory.

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

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[codecov]

Codecov Report

Merging #51123 (8cd8350) into master (65d57c0) will increase coverage by 0.5162%.
Report is 8 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51123        +/-   ##
================================================
+ Coverage   72.2960%   72.8122%   +0.5162%     
================================================
  Files          1467       1467                
  Lines        361760     436491     +74731     
================================================
+ Hits         261538     317819     +56281     
- Misses        80904      98750     +17846     
- Partials      19318      19922       +604     

Flag	Coverage Δ
integration	49.1956% <0.0000%> (?)
unit	70.3885% <100.0000%> (-1.7645%)	⬇️

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

Components	Coverage Δ
dumpling	54.0571% <ø> (-2.2558%)	⬇️
parser	∅ <ø> (∅)
br	52.1216% <ø> (+5.7873%)	⬆️

[Rustin170506]

/retest

[Rustin170506]

🔢 Self-check

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-18 10:08:06.707486727 +0000 UTC m=+178975.455109855: ☑️ agreed by hawkingrei.
• 2024-02-19 08:16:33.563550298 +0000 UTC m=+258682.311173410: ☑️ agreed by AilinKid.