planner: refactor order ratio code

[terry1purcell]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What changed and how does it work?

Check List

Tests

• [x] 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[bot]]

Hi @terry1purcell. Thanks for your PR.

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 73.2981%. Comparing base (c35d9ef) to head (227ae40). :warning: Report is 20 commits behind head on master.

:warning: Current head 227ae40 differs from pull request most recent head 2f1ec4d

Please upload reports for the commit 2f1ec4d to get more accurate results.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61787        +/-   ##
================================================
+ Coverage   72.8847%   73.2981%   +0.4134%     
================================================
  Files          1771       1778         +7     
  Lines        486220     492752      +6532     
================================================
+ Hits         354380     361178      +6798     
+ Misses       110197     109673       -524     
- Partials      21643      21901       +258     

Flag	Coverage Δ
integration	42.2664% <80.0000%> (?)
unit	72.1723% <100.0000%> (+0.0105%)	:arrow_up:

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	45.6185% <ø> (-0.7202%)	:arrow_down:

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[terry1purcell]

/retest-required

[tiprow[bot]]

@terry1purcell: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest-required

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[terry1purcell]

/retest-required

[tiprow[bot]]

@terry1purcell: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest-required

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 kubernetes-sigs/prow repository.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qw4990, time-and-fate

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [qw4990,time-and-fate]
• ~~pkg/planner/OWNERS~~ [qw4990,time-and-fate]

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-08-01 06:50:10.050188769 +0000 UTC m=+246822.735458995: :ballot_box_with_check: agreed by qw4990.
• 2025-08-03 19:22:03.196075979 +0000 UTC m=+209633.338837144: :ballot_box_with_check: agreed by time-and-fate.

[ti-chi-bot[bot]]

@terry1purcell: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
non-block/pull-unit-test-next-gen	2f1ec4d0a95ac55b88239cfccdbfe8709db6350b	link	false	/test pull-unit-test-next-gen
non-block/pull-mysql-client-test-next-gen	2f1ec4d0a95ac55b88239cfccdbfe8709db6350b	link	false	/test pull-mysql-client-test-next-gen
non-block/pull-integration-e2e-test-next-gen	2f1ec4d0a95ac55b88239cfccdbfe8709db6350b	link	false	/test pull-integration-e2e-test-next-gen
non-block/pull-mysql-test-next-gen	2f1ec4d0a95ac55b88239cfccdbfe8709db6350b	link	false	/test pull-mysql-test-next-gen

Full PR test history. Your PR dashboard.

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 kubernetes-sigs/prow repository. I understand the commands that are listed here.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #62797. But this PR has conflicts, please resolve them!