pkg/planner: set proj.AvoidColumnEvaluator in postOptimize (#55333)

[ti-chi-bot]

This is an automated cherry-pick of #55333

What problem does this PR solve?

Issue Number: close #52985

Problem Summary:

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.

Fixed an issue where certain queries were producing incorrect results. This was caused by a bug in the query processing logic related to the handling of the projection operator which is a child of Union operator.

[fixdb]

+1

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-24 19:07:02.606518382 +0000 UTC m=+1592892.346942313: ☑️ agreed by winoros.
• 2024-09-25 04:48:24.066782735 +0000 UTC m=+1627773.807206672: ☑️ agreed by fixdb.

[fixdb]

@XuHuaiyu can you fix the test failure?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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##             release-7.5     #55354   +/-   ##
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Flag	Coverage Δ
unit	72.0121% <100.0000%> (?)

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Components	Coverage Δ
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parser	∅ <0.0000%> (?)
br	53.5359% <0.0000%> (?)