ddl: add more corner tests for active-active | tidb-test=release-8.5-20260121-v8.5.5

[xhebox]

What problem does this PR solve?

Issue Number: ref #64281
Problem Summary:

1. show create view will hide internal columns now
2. ignore tidb_cdc db
3. forbid unique index on softdelete table
4. clone softdelete info
5. more tests

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 @xhebox. Thanks for your PR.

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[xhebox]

/ok-to-test

[codecov]

Codecov Report

❌ Patch coverage is 89.74359% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-8.5-20260121-v8.5.5@f5ceded). Learn more about missing BASE report.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             release-8.5-20260121-v8.5.5     #66252   +/-   ##
================================================================
  Coverage                               ?   55.4329%           
================================================================
  Files                                  ?       1820           
  Lines                                  ?     653557           
  Branches                               ?          0           
================================================================
  Hits                                   ?     362286           
  Misses                                 ?     264373           
  Partials                               ?      26898           

Flag	Coverage Δ
integration	39.2549% <79.4871%> (?)
unit	64.8133% <51.2820%> (?)

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

Components	Coverage Δ
dumpling	52.9278% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	63.8965% <0.0000%> (?)

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[xhebox]

/hold

[D3Hunter]

rest of non BR part lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-02-13 10:14:41.492410836 +0000 UTC m=+4249.238804864: ☑️ agreed by lcwangchao.
• 2026-02-13 10:43:23.182922642 +0000 UTC m=+5970.929316674: ☑️ agreed by D3Hunter.

[lcwangchao]

/retest

[lcwangchao]

/retest

[lcwangchao]

/retest

[xhebox]

/retest

[xhebox]

/retest

[xhebox]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, Leavrth

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [D3Hunter,Leavrth]
• br/OWNERS [Leavrth]
• pkg/ddl/OWNERS [D3Hunter]
• pkg/meta/OWNERS [D3Hunter]
• pkg/parser/OWNERS [D3Hunter]

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

[lcwangchao]

/retest

[lcwangchao]

/retest

[xhebox]

/unhold