planner: fix the unstable test TestOrderedResultModeOnOtherOperators (#26481)

[ti-srebot]

cherry-pick #26481 to release-5.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/26492

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/26492:release-5.0-1c088522c882

---

What problem does this PR solve?

Issue Number: close #26376

Problem Summary: planner: fix the unstable test TestOrderedResultModeOnOtherOperators

What is changed and how it works?

This query has two window-spec fields that both are partitioned by a, but now the optimizer cannot sort them stably in this case:

To fix this unstable test quickly, I remove one field.

Check List

Tests

• Unit test

Release note

• No release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Reminiscent
• winoros

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[ti-srebot]

/run-all-tests

[ti-srebot]

@qw4990 you're already a collaborator in bot's repo.

[ti-chi-bot]

@ti-srebot: PR needs rebase.

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[qw4990]

/rebuild

[qw4990]

�It seems the bot check conflicting files wrongly, I'll close this and submit another pick PR later.

[qw4990]

I found this PR has already been picked by #23373