planner: add tolerance for row count floating point comparison

[terry1purcell]

What problem does this PR solve?

Issue Number: close #59133

Problem Summary:

What changed and how does it work?

Due to precision errors in floating point, a small tolerance is needed to ensure that an unnecessary adjustments are not made for cardinality estimation. An arbitrary value of 0.00001 is used as the tolerance.

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 @terry1purcell. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.5983%. Comparing base (43f2fb9) to head (1fed4d2).
Report is 9 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59241        +/-   ##
================================================
+ Coverage   73.0608%   73.5983%   +0.5375%     
================================================
  Files          1689       1689                
  Lines        467012     467562       +550     
================================================
+ Hits         341203     344118      +2915     
+ Misses       104839     102532      -2307     
+ Partials      20970      20912        -58     

Flag	Coverage Δ
integration	42.8271% <100.0000%> (?)
unit	72.3884% <100.0000%> (+0.1530%)	⬆️

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	45.5004% <ø> (+0.0286%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [hawkingrei,winoros]
• pkg/planner/OWNERS [hawkingrei,winoros]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-05 04:03:35.273956429 +0000 UTC m=+244486.806368421: ☑️ agreed by winoros.
• 2025-02-06 05:58:10.376215828 +0000 UTC m=+337761.908627826: ☑️ agreed by hawkingrei.

[terry1purcell]

/cherry-pick release-8.5

[ti-chi-bot]

@terry1purcell: new pull request created to branch release-8.5: #59278.
But this PR has conflicts, please resolve them!

In response to this:

/cherry-pick release-8.5

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[terry1purcell]

/cherry-pick release-8.1

[ti-chi-bot]

@terry1purcell: new pull request created to branch release-8.1: #59334.
But this PR has conflicts, please resolve them!

In response to this:

/cherry-pick release-8.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.