*: add expression default values feature relevant tests and fix the "extra" field issue.

[zimulala]

What problem does this PR solve?

Issue Number: close #51462, close #51481

Problem Summary:

What changed and how does it work?

• Add expression default values feature relevant tests for different data types and default keywords.
• Fix the issue of that the "extra" field in the result of "show columns" with default value expressions is not processed.

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 @zimulala. Thanks for your PR.

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[codecov]

Codecov Report

Merging #51482 (26c0cdc) into master (718c7a3) will increase coverage by 2.1824%.
Report is 28 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51482        +/-   ##
================================================
+ Coverage   70.7479%   72.9303%   +2.1824%     
================================================
  Files          1462       1463         +1     
  Lines        435179     440094      +4915     
================================================
+ Hits         307880     320962     +13082     
+ Misses       108058      98987      -9071     
- Partials      19241      20145       +904     

Flag	Coverage Δ
integration	49.1604% <100.0000%> (?)
unit	70.4544% <100.0000%> (-0.0980%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	51.6782% <ø> (+5.7976%)	⬆️

[Defined2014]

Is it a bug? Maybe we already have a same issue, please check it.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, tangenta

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-05 03:43:24.77790334 +0000 UTC m=+138631.800149728: ☑️ agreed by Defined2014.
• 2024-03-05 05:50:36.754618809 +0000 UTC m=+146263.776865194: ☑️ agreed by tangenta.

[zimulala]

/test unit-test

[tiprow]

@zimulala: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test unit-test

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