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.

[ti-chi-bot]

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@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	5b19ce2	link	true	/test unit-test
idc-jenkins-ci-tidb/build	5b19ce2	link	true	/test build

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