store: remove stores that have no region before balance

[xzhangxian1008]

What problem does this PR solve?

Issue Number: ref #52313

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

[ti-chi-bot[bot]]

This cherry pick PR is for a release branch and has not yet been approved by triage owners. Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

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[xzhangxian1008]

/cc @windtalker

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please assign yangkeao for approval. For more information see the Code Review Process.

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[tiprow[bot]]

Hi @xzhangxian1008. 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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[ti-chi-bot[bot]]

@xzhangxian1008: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev	27b776374d9198c134f0854a0a47ef14b30097ba	link	true	/test check-dev

Full PR test history. Your PR dashboard.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 70.83333% with 14 lines in your changes are missing coverage. Please review.

Please upload report for BASE (release-7.5@2ecc47d). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #52966   +/-   ##
================================================
  Coverage               ?   72.0517%           
================================================
  Files                  ?       1411           
  Lines                  ?     411493           
  Branches               ?          0           
================================================
  Hits                   ?     296488           
  Misses                 ?      95170           
  Partials               ?      19835           

Flag	Coverage Δ
unit	72.0517% <70.8333%> (?)

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

Components	Coverage Δ
dumpling	53.9913% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.3144% <0.0000%> (?)

[ti-chi-bot[bot]]

@yibin87: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

LGTM

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/test-infra repository.

[xzhangxian1008]

/retest

[tiprow[bot]]

@xzhangxian1008: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-05-24 03:42:21.391456029 +0000 UTC m=+2402295.148591602: :ballot_box_with_check: agreed by windtalker.
• 2024-05-27 04:46:56.158481102 +0000 UTC m=+2665369.915616673: :ballot_box_with_check: agreed by SeaRise.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SeaRise, windtalker, yibin87, zanmato1984

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The pull request process is described here

Needs approval from an approver in each of these files:

• ~~OWNERS~~ [windtalker,zanmato1984]

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment