*: modify the printing of column default expression in SHOW CREATE TABLE and Restore (#52940)

[ti-chi-bot]

This is an automated cherry-pick of #52940

What problem does this PR solve?

Issue Number: close #52939

Problem Summary:

See the description of the issue.

What changed and how does it work?

If the column default expression is ast.FuncCallExpr except ast.CurrentTimestamp, wrap an outer parentheses in SHOW CREATE TABLE and Restore()

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.

Wrap some column default expressions within parentheses in SHOW CREATE TABLE and Restore

[codecov]

Codecov Report

Attention: Patch coverage is 85.00000% with 3 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release-7.5@0359bbc). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #52951   +/-   ##
================================================
  Coverage               ?   71.9867%           
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  Files                  ?       1410           
  Lines                  ?     409492           
  Branches               ?          0           
================================================
  Hits                   ?     294780           
  Misses                 ?      94877           
  Partials               ?      19835           

Flag	Coverage Δ
unit	71.9867% <85.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9913% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.3534% <0.0000%> (?)

[easonn7]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CbcWestwolf, easonn7, tangenta

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Needs approval from an approver in each of these files:

• OWNERS [CbcWestwolf,tangenta]
• pkg/ddl/OWNERS [tangenta]
• pkg/parser/OWNERS [easonn7,tangenta]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-29 01:36:58.705782351 +0000 UTC m=+234772.462917919: ☑️ agreed by CbcWestwolf.
• 2024-04-29 01:52:48.842041829 +0000 UTC m=+235722.599177401: ☑️ agreed by tangenta.