ddl: clone table for show columns

[GMHDBJD]

What problem does this PR solve?

Issue Number: close #55301

Problem Summary:

What changed and how does it work?

• clone table before fill column types

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  see *: a demo PR to verify infoschema v1 and infoschema v2 #52688

Running tool: /usr/local/go/bin/go test -timeout 10m -coverprofile=/tmp/vscode-gomVYcKs/go-code-cover -run ^TestShowViewPriv$ github.com/pingcap/tidb/pkg/privilege/privileges -race --tags=intest

ok  	github.com/pingcap/tidb/pkg/privilege/privileges	12.034s	coverage: 27.4% of statements

• 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 @GMHDBJD. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 74.8015%. Comparing base (d0c1ca1) to head (739e30c).
Report is 13 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55309        +/-   ##
================================================
+ Coverage   72.8488%   74.8015%   +1.9526%     
================================================
  Files          1570       1570                
  Lines        439488     441479      +1991     
================================================
+ Hits         320162     330233     +10071     
+ Misses        99607      90993      -8614     
- Partials      19719      20253       +534     

Flag	Coverage Δ
integration	49.1724% <25.0000%> (?)
unit	71.7976% <25.0000%> (-0.0802%)	⬇️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	52.5154% <ø> (+6.6366%)	⬆️

[GMHDBJD]

/retest

[tiprow]

@GMHDBJD: 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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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716, wjhuang2016

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-08 10:20:09.187017357 +0000 UTC m=+520139.054116444: ☑️ agreed by lance6716.
• 2024-08-09 06:28:35.712996047 +0000 UTC m=+592645.580095135: ☑️ agreed by wjhuang2016.