model(ticdc): optimize OffsetsByNames function

[wk989898]

What problem does this PR solve?

Issue Number: close #11487

What is changed and how it works?

As title.

Check List

Tests

• Unit test
• Integration test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

[ti-chi-bot[bot]]

Hi @wk989898. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please ask for approval from wk989898, ensuring that each of them provides their approval before proceeding. For more information see the Code Review Process.

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[wk989898]

/retest

[wk989898]

/retest

[codecov[bot]]

Codecov Report

:x: Patch coverage is 66.66667% with 6 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 55.1606%. Comparing base (64decf6) to head (3c62848). :warning: Report is 137 commits behind head on master.

:x: Your project check has failed because the head coverage (53.6074%) is below the target coverage (60.0000%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

Components	Coverage Δ
cdc	54.9774% <66.6666%> (-4.6028%)	:arrow_down:
dm	48.7562% <ø> (-1.3112%)	:arrow_down:
engine	∅ <ø> (∅)

Flag	Coverage Δ
unit	53.6074% <66.6666%> (-1.5285%)	:arrow_down:

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

@@               Coverage Diff                @@
##             master     #11488        +/-   ##
================================================
+ Coverage   55.1358%   55.1606%   +0.0248%     
================================================
  Files          1001       1001                
  Lines        136521     136523         +2     
================================================
+ Hits          75272      75307        +35     
+ Misses        55740      55707        -33     
  Partials       5509       5509                

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