planner: prevent pushing Projection with virtual columns down to UnionScan

[qw4990]

What problem does this PR solve?

Issue Number: close #53951

Problem Summary: planner: prevent pushing Projection with virtual columns down to UnionScan

What changed and how does it work?

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 @qw4990. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.7931%. Comparing base (f124165) to head (d6477fa).
Report is 4 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #53981         +/-   ##
=================================================
- Coverage   74.5222%   55.7931%   -18.7292%     
=================================================
  Files          1508       1628        +120     
  Lines        358470     604334     +245864     
=================================================
+ Hits         267140     337177      +70037     
- Misses        71953     243909     +171956     
- Partials      19377      23248       +3871     

Flag	Coverage Δ
integration	37.3229% <100.0000%> (?)
unit	71.4444% <100.0000%> (-1.9690%)	⬇️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (-2.2339%)	⬇️
parser	∅ <ø> (∅)
br	50.5858% <ø> (+6.6843%)	⬆️

[fixdb]

+1

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fixdb, XuHuaiyu

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Needs approval from an approver in each of these files:

• OWNERS [XuHuaiyu,fixdb]
• pkg/planner/OWNERS [fixdb]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-13 10:16:54.018908669 +0000 UTC m=+632568.072220594: ☑️ agreed by XuHuaiyu.
• 2024-06-13 18:11:31.875781508 +0000 UTC m=+661045.929093431: ☑️ agreed by fixdb.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #54014.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #54351.

[ti-chi-bot]

In response to a cherrypick label: new pull request could not be created: failed to create pull request against pingcap/tidb#release-8.1 from head ti-chi-bot:cherry-pick-53981-to-release-8.1: the GitHub API request returns a 403 error: {"message":"You have exceeded a secondary rate limit and have been temporarily blocked from content creation. Please retry your request again later. If you reach out to GitHub Support for help, please include the request ID 8AAC:12E1BA:5C7E31:AFF94D:66A35422 and timestamp 2024-07-26 07:45:39 UTC.","documentation_url":"https://docs.github.com/rest/overview/rate-limits-for-the-rest-api#about-secondary-rate-limits","status":"403"}

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #54986.