placement: fix alter placement policy cannot update the relative ranges policy (#52254)

[ti-chi-bot]

This is an automated cherry-pick of #52254

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

[ti-chi-bot]

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

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[codecov]

Codecov Report

Attention: Patch coverage is 72.50000% with 22 lines in your changes are missing coverage. Please review.

Please upload report for BASE (release-7.5@df53876). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #53077   +/-   ##
================================================
  Coverage               ?   73.3605%           
================================================
  Files                  ?       1411           
  Lines                  ?     423991           
  Branches               ?          0           
================================================
  Hits                   ?     311042           
  Misses                 ?      93178           
  Partials               ?      19771           

Flag	Coverage Δ
unit	73.3605% <72.5000%> (?)

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	54.4915% <0.0000%> (?)

[lhy1024]

@nolouch Do we need to merge it to 7.5?

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [xhebox,zimulala]
• pkg/ddl/OWNERS [zimulala]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-22 06:26:36.125327459 +0000 UTC m=+2239349.882463028: ☑️ agreed by xhebox.
• 2024-05-28 08:04:51.708986114 +0000 UTC m=+2763645.466121684: ☑️ agreed by zimulala.

[lhy1024]

/retest

[lhy1024]

/retest

[lhy1024]

/retest

[lhy1024]

/test mysql-test

[lhy1024]

/test unit-test

[tiprow]

@lhy1024: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test mysql-test

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[tiprow]

@lhy1024: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test unit-test

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