planner: column pruning should use a shallow copy slice

[winoros]

What problem does this PR solve?

Issue Number: close #52768

Problem Summary:

What changed and how does it work?

The slice passed to the column pruning should be shallow copied.

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

[winoros]

The test in the issue is too long. I'm trying to simplify it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.3534%. Comparing base (37b29bd) to head (8c1b9cf).
Report is 25 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #53237        +/-   ##
================================================
+ Coverage   72.4582%   75.3534%   +2.8952%     
================================================
  Files          1493       1498         +5     
  Lines        429362     437144      +7782     
================================================
+ Hits         311108     329403     +18295     
+ Misses        98985      87817     -11168     
- Partials      19269      19924       +655     

Flag	Coverage Δ
integration	50.2045% <100.0000%> (?)
unit	72.1499% <100.0000%> (+0.7935%)	⬆️

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	50.3807% <ø> (+8.9505%)	⬆️

[winoros]

/retest

[time-and-fate]

/hold

waiting for test cases

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-13 16:19:40.141915793 +0000 UTC m=+1497333.899051368: ☑️ agreed by AilinKid.
• 2024-05-14 03:45:04.930091917 +0000 UTC m=+1538458.687227492: ☑️ agreed by time-and-fate.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, hawkingrei, time-and-fate

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• pkg/planner/OWNERS [AilinKid,hawkingrei,time-and-fate]

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[winoros]

/unhold first, try to provide a test later

[winoros]

/unhold

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #53322.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #53323.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #53324.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #53325.