stmtsummary: tiny optimize by avoiding unnecessary calculations

[crazycs520]

What problem does this PR solve?

Issue Number: ref #56649

Problem Summary: tiny optimize by avoiding unnecessary calculations

What changed and how does it work?

Before:

Index-lookup query benchmark:

This PR:

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

[tiprow]

Hi @crazycs520. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.5967%. Comparing base (9b70321) to head (61f290c).
Report is 4 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58562        +/-   ##
================================================
+ Coverage   73.5206%   73.5967%   +0.0760%     
================================================
  Files          1680       1680                
  Lines        464619     464632        +13     
================================================
+ Hits         341591     341954       +363     
+ Misses       102166     101841       -325     
+ Partials      20862      20837        -25     

Flag	Coverage Δ
integration	42.8886% <94.4444%> (?)
unit	72.3176% <100.0000%> (+0.0566%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	45.7685% <ø> (-0.0060%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cfzjywxk, zyguan

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-27 03:30:42.304366493 +0000 UTC m=+61977.660371032: ☑️ agreed by zyguan.
• 2024-12-27 05:54:44.347087621 +0000 UTC m=+70619.703092162: ☑️ agreed by cfzjywxk.