planner: make sure mpp join task's hashCols are all contained of its plan's schema (#52836)

[ti-chi-bot]

This is an automated cherry-pick of #52836

What problem does this PR solve?

Issue Number: close #42587

Problem Summary:

In physical projection elimination, when a projection is above another projection and satisfy certain conditions, we'll remove current projection and use current projection's schema to reset child projection. However,
empty projection(which schema is totally pruned) with projection child, will set child projection's schema to empty, which doesn't make sense. In such situation, keep child projection's schema seems more reasonable.

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

[yibin87]

/cc @hawkingrei @Rustin170506

[yibin87]

/cc @winoros

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.5@3c2d1af). Learn more about missing BASE report.

Additional details and impacted files

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Flag	Coverage Δ
unit	71.9977% <100.0000%> (?)

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-26 08:45:28.080302935 +0000 UTC m=+773523.214753057: ☑️ agreed by hawkingrei.
• 2024-08-26 08:58:37.6893449 +0000 UTC m=+774312.823795018: ☑️ agreed by winoros.