sqlmodel(dm): support generating UPDATE CASE WHEN

[lance6716]

What problem does this PR solve?

Issue Number: close https://github.com/pingcap/tiflow/issues/3408

What is changed and how it works?

as title

Check List

Tests

• Unit 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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• GMHDBJD
• buchuitoudegou

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment. After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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[lance6716]

/run-dm-integration-test

[lance6716]

/cc @GMHDBJD @dsdashun

[lance6716]

/check-issue-triage-complete

[lance6716]

/cc @Ehco1996

[lance6716]

ptal @buchuitoudegou

[lance6716]

ptal @GMHDBJD @dsdashun

[lance6716]

ptal @GMHDBJD @dsdashun

[GMHDBJD]

Have not measured the syntax, not sure if the performance has improved and there are no other side effects

[lance6716]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: fefb0130b962ba05625988f9d804aee928c05863

[asddongmen]

/run-verify

[codecov-commenter]

Codecov Report

Merging #7268 (2e11a44) into master (2843d67) will increase coverage by 0.2463%. The diff coverage is 59.8176%.

Additional details and impacted files

Flag	Coverage Δ
cdc	67.7458% <65.2725%> (+0.5261%)	:arrow_up:
dm	52.0036% <45.6521%> (+0.0985%)	:arrow_up:
engine	60.8386% <53.6379%> (-0.2189%)	:arrow_down:

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

@@               Coverage Diff                @@
##             master      #7268        +/-   ##
================================================
+ Coverage   59.6477%   59.8940%   +0.2462%     
================================================
  Files           790        798         +8     
  Lines         91016      91550       +534     
================================================
+ Hits          54289      54833       +544     
+ Misses        31982      31946        -36     
- Partials       4745       4771        +26