placement: fix alter placement policy cannot update the relative ranges policy

[jiyfhust]

What problem does this PR solve?

Issue Number: close #51712 close #52257

Problem Summary:

What changed and how does it work?

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 @jiyfhust. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 63.75000% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 73.9705%. Comparing base (555ce02) to head (378227d).
Report is 194 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #52254        +/-   ##
================================================
+ Coverage   70.1622%   73.9705%   +3.8082%     
================================================
  Files          1485       1511        +26     
  Lines        419217     467558     +48341     
================================================
+ Hits         294132     345855     +51723     
+ Misses       105672     101191      -4481     
- Partials      19413      20512      +1099     

Flag	Coverage Δ
integration	48.3273% <40.0000%> (?)

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

Components	Coverage Δ
dumpling	53.8802% <ø> (-2.4170%)	⬇️
parser	∅ <ø> (∅)
br	43.5831% <ø> (+1.3351%)	⬆️

[jiyfhust]

/ok-to-test

[jiyfhust]

/test tidb_parser_test

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[hawkingrei]

@jiyfhust Please sync with master.

[jiyfhust]

/cc @nolouch

[jiyfhust]

/retest-required

[jiyfhust]

/cc @zimulala

[nolouch]

lgtm. thanks!

[jiyfhust]

/cc @xhebox

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-08 09:55:19.399449279 +0000 UTC m=+869780.926989825: ☑️ agreed by nolouch.
• 2024-04-12 03:07:34.411193589 +0000 UTC m=+1190915.938734137: ☑️ agreed by xhebox.

[jiyfhust]

please assign benjamin2037 for approval.

PTAL @zimulala @Benjamin2037

[jiyfhust]

/cc @Benjamin2037

[nolouch]

/test

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[nolouch]

/retest-required

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nolouch, xhebox, zimulala

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #53077.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #55092.