planner: fix leading hint cannot take effect in UNION ALL statements (#50277)

[ti-chi-bot]

This is an automated cherry-pick of #50277

What problem does this PR solve?

Issue Number: close #50067

Problem Summary:

What changed and how does it work?

the root cause is that the PlanBuilder.tableHintInfo will be overwritten by push/pop in the buildSelect

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

[elsa0520]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elsa0520, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-11 09:24:56.300413016 +0000 UTC m=+521685.884666688: ☑️ agreed by hawkingrei.
• 2024-01-11 09:26:59.38308781 +0000 UTC m=+521808.967341519: ☑️ agreed by elsa0520.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.5@4a8c7b2). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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##             release-7.5     #50323   +/-   ##
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Flag	Coverage Δ
unit	71.9651% <0.0000%> (?)

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Components	Coverage Δ
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parser	∅ <0.0000%> (?)
br	53.2754% <0.0000%> (?)