planner: return an error when meeting unexpected operator under UnionScan

[qw4990]

What problem does this PR solve?

Issue Number: ref #53951

Problem Summary: planner: return an error when meeting unexpected operator under 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

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 55.8258%. Comparing base (ec6f56e) to head (68cbc07).
Report is 925 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #53956         +/-   ##
=================================================
- Coverage   72.5819%   55.8258%   -16.7562%     
=================================================
  Files          1508       1628        +120     
  Lines        431760     602968     +171208     
=================================================
+ Hits         313380     336612      +23232     
- Misses        99022     243181     +144159     
- Partials      19358      23175       +3817     

Flag	Coverage Δ
integration	37.3645% <12.5000%> (?)
unit	71.4705% <12.5000%> (-0.1031%)	⬇️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	50.5192% <ø> (+8.2903%)	⬆️

[qw4990]

/test unit-test

[tiprow]

@qw4990: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test unit-test

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wjhuang2016, XuHuaiyu

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Needs approval from an approver in each of these files:

• OWNERS [XuHuaiyu,wjhuang2016]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-12 09:38:40.892538715 +0000 UTC m=+543874.945850636: ☑️ agreed by wjhuang2016.
• 2024-06-12 09:39:24.066347381 +0000 UTC m=+543918.119659306: ☑️ agreed by XuHuaiyu.

[hawkingrei]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #53968.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #53969.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #53970.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #53971.