planner: fix Uncertain Results caused by MERGE_JOIN (#47078)

[ti-chi-bot]

This is an automated cherry-pick of #47078

What problem does this PR solve?

Issue Number: close #46580

Problem Summary: planner: fix Uncertain Results caused by MERGE_JOIN

What is changed and how it works?

Similar to #8073, see it for more explanation.

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

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, qw4990

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [hawkingrei,qw4990]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-19 07:52:08.96218553 +0000 UTC m=+1902726.549295679: ☑️ agreed by qw4990.
• 2023-10-19 07:52:44.3438714 +0000 UTC m=+1902761.930981546: ☑️ agreed by hawkingrei.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@71bcc44). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #47080   +/-   ##
================================================
  Coverage               ?   73.6691%           
================================================
  Files                  ?       1085           
  Lines                  ?     348428           
  Branches               ?          0           
================================================
  Hits                   ?     256684           
  Misses                 ?      75266           
  Partials               ?      16478