ddl: export method for needChangeColumns

[GMHDBJD]

What problem does this PR solve?

Issue Number: ref #46258 pingcap/tiflow#9850

Problem Summary:

What is changed and how it works?

export method for dm to judge ddl type

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 @GMHDBJD. Thanks for your PR.

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[codecov]

Codecov Report

Merging #47492 (adb7b1d) into master (1f5179a) will increase coverage by 0.6617%.
Report is 8 commits behind head on master.
The diff coverage is 83.7837%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47492        +/-   ##
================================================
+ Coverage   72.0917%   72.7534%   +0.6617%     
================================================
  Files          1353       1376        +23     
  Lines        401214     409201      +7987     
================================================
+ Hits         289242     297708      +8466     
+ Misses        92700      92640        -60     
+ Partials      19272      18853       -419     

Flag	Coverage Δ
integration	39.6926% <59.4594%> (?)
unit	72.2029% <83.7837%> (+0.1112%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	84.6681% <ø> (ø)
br	48.9150% <ø> (-4.2883%)	⬇️

[GMHDBJD]

/retest

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[GMHDBJD]

/retest

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[GMHDBJD]

/retest

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: okJiang, tangenta

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-10 07:19:37.383113565 +0000 UTC m=+1123174.970223708: ☑️ agreed by tangenta.
• 2023-10-10 07:38:28.472058028 +0000 UTC m=+1124306.059168173: ☑️ agreed by okJiang.

[okJiang]

/ok-to-test

[GMHDBJD]

/merge

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