planner: fix mpp final agg couldn't co-exist with other non-final mode (#53455)

[ti-chi-bot]

This is an automated cherry-pick of #53455

What problem does this PR solve?

Issue Number: close #51362

Problem Summary:

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.

planner: fix mpp final agg couldn't co-exist with non-final mode

[AilinKid]

/test unit-test

[tiprow]

@AilinKid: No presubmit jobs available for pingcap/tidb@release-8.1

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: AilinKid, XuHuaiyu

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Needs approval from an approver in each of these files:

• OWNERS [AilinKid,XuHuaiyu]
• pkg/expression/OWNERS [XuHuaiyu]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-16 08:48:30.121685053 +0000 UTC m=+343732.112626530: ☑️ agreed by AilinKid.
• 2024-07-16 08:51:30.434726508 +0000 UTC m=+343912.425667978: ☑️ agreed by XuHuaiyu.

[AilinKid]

/test unit-test

[tiprow]

@AilinKid: No presubmit jobs available for pingcap/tidb@release-8.1

In response to this:

/test unit-test

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-sigs/prow repository.

[codecov]

Codecov Report

Attention: Patch coverage is 92.68293% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.1@945d07c). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #53476   +/-   ##
================================================
  Coverage               ?   71.8015%           
================================================
  Files                  ?       1465           
  Lines                  ?     428498           
  Branches               ?          0           
================================================
  Hits                   ?     307668           
  Misses                 ?     100445           
  Partials               ?      20385           

Flag	Coverage Δ
unit	71.8015% <92.6829%> (?)

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

Components	Coverage Δ
dumpling	53.9957% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	40.7434% <0.0000%> (?)

[AilinKid]

/rebuild

[winoros]

/retest

[qw4990]

/retest