ddl: refine syntax details | tidb-test=feature/active-active tikv=feature/active-active

[xhebox]

What problem does this PR solve?

Issue Number: ref #64281

Problem Summary: Refined syntax, more tests, hidden column, and new system variable tidb_translate_softdelete_sql

What changed and how does it work?

Check List

Tests

• [x] Unit test
• [x] 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 @xhebox. Thanks for your PR.

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 77.73438% with 57 lines in your changes missing coverage. Please review. :warning: Please upload report for BASE (feature/active-active@b20f139). Learn more about missing BASE report.

Additional details and impacted files

@@                    Coverage Diff                     @@
##             feature/active-active     #64962   +/-   ##
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  Coverage                         ?   74.8312%           
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==========================================================
  Hits                             ?     386026           
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  Partials                         ?      23724           

Flag	Coverage Δ
integration	48.3320% <77.9220%> (?)
unit	72.2449% <30.0781%> (?)

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

Components	Coverage Δ
dumpling	52.8700% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	63.2285% <0.0000%> (?)

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[xhebox]

/retest

[tiprow[bot]]

@xhebox: 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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[xhebox]

/ok-to-test

[lcwangchao]

/retest

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lcwangchao, tiancaiamao Once this PR has been reviewed and has the lgtm label, please assign ailinkid, benjamin2037, yudongusa for approval. For more information see the Code Review Process. Please ensure that each of them provides their approval before proceeding.

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [lcwangchao,tiancaiamao]
• pkg/ddl/OWNERS
• pkg/infoschema/OWNERS
• pkg/meta/OWNERS
• pkg/parser/OWNERS
• pkg/planner/OWNERS
• pkg/sessionctx/vardef/OWNERS
• pkg/sessionctx/variable/OWNERS
• pkg/table/OWNERS

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

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-12-11 06:15:40.940121671 +0000 UTC m=+1108085.753899244: :ballot_box_with_check: agreed by lcwangchao.
• 2025-12-11 15:05:00.687016117 +0000 UTC m=+1139845.500793689: :ballot_box_with_check: agreed by tiancaiamao.

[xhebox]

/retest