ddl: use another way to get index uniqueness during task exec init

[tangenta]

What problem does this PR solve?

Issue Number: ref #50307, close #50435

What changed and how does it work?

This PR fixes the stuck issue cause by indexInfo not found when cancelling the task.

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]

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[codecov]

Codecov Report

Merging #50378 (8038968) into master (ad1592c) will decrease coverage by 14.4333%.
Report is 23 commits behind head on master.
The diff coverage is 80.7692%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50378         +/-   ##
=================================================
- Coverage   70.0238%   55.5905%   -14.4333%     
=================================================
  Files          1444       1556        +112     
  Lines        419997     587796     +167799     
=================================================
+ Hits         294098     326759      +32661     
- Misses       105570     238319     +132749     
- Partials      20329      22718       +2389     

Flag	Coverage Δ
integration	36.8041% <78.8461%> (?)
unit	70.1514% <17.3076%> (+0.1275%)	⬆️

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

Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	55.7861% <ø> (+6.1283%)	⬆️

[D3Hunter]

lgtm if existing integration test can cover this

[D3Hunter]

why? we just upgrade it. #50179

[tangenta]

There is a network problem with ks3 Read(). I want to make a quick test by downgrading it.

[Benjamin2037]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-12 10:18:40.283605693 +0000 UTC m=+611309.867859379: ☑️ agreed by D3Hunter.
• 2024-01-16 03:21:24.944862989 +0000 UTC m=+239726.509160694: ☑️ agreed by Benjamin2037.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, D3Hunter, ywqzzy

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Needs approval from an approver in each of these files:

• br/pkg/lightning/OWNERS [Benjamin2037,D3Hunter]
• pkg/ddl/OWNERS [Benjamin2037,ywqzzy]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #50452.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #50497.