disttask/ddl: add log for add index operators

[ywqzzy]

What problem does this PR solve?

Issue Number: ref #48779

Problem Summary:

What changed and how does it work?

Add some log for easier debugging.

Check List

Tests

• [x] 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[bot]]

Hi @ywqzzy. Thanks for your PR.

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[codecov[bot]]

Codecov Report

Merging #51267 (5ea993e) into master (f0a26dd) will decrease coverage by 15.3569%. Report is 94 commits behind head on master. The diff coverage is 80.0000%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #51267         +/-   ##
=================================================
- Coverage   70.5842%   55.2273%   -15.3570%     
=================================================
  Files          1467       1582        +115     
  Lines        434825     627669     +192844     
=================================================
+ Hits         306918     346645      +39727     
- Misses       108672     256986     +148314     
- Partials      19235      24038       +4803     

Flag	Coverage Δ
integration	37.0404% <80.0000%> (?)
unit	70.4488% <0.0000%> (+0.0517%)	:arrow_up:

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

Components	Coverage Δ
dumpling	54.2644% <ø> (-0.0297%)	:arrow_down:
parser	∅ <ø> (∅)
br	49.8113% <ø> (+4.0662%)	:arrow_up:

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-02-23 07:26:22.355512307 +0000 UTC m=+601271.103135439: :ballot_box_with_check: agreed by lance6716.
• 2024-02-26 07:31:11.3985013 +0000 UTC m=+860760.146124396: :ballot_box_with_check: agreed by D3Hunter.

[ywqzzy]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, lance6716, ywqzzy

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [D3Hunter,lance6716,ywqzzy]
• ~~pkg/ddl/OWNERS~~ [ywqzzy]

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[ywqzzy]

/retest

[tiprow[bot]]

@ywqzzy: 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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