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

[AilinKid]

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

[tiprow]

Hi @AilinKid. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 82.92683% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 73.7585%. Comparing base (2d552c0) to head (9f3e1ac).
Report is 51 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #53455        +/-   ##
================================================
+ Coverage   72.4523%   73.7585%   +1.3061%     
================================================
  Files          1493       1524        +31     
  Lines        429365     443424     +14059     
================================================
+ Hits         311085     327063     +15978     
+ Misses        99001      96144      -2857     
- Partials      19279      20217       +938     

Flag	Coverage Δ
integration	49.1316% <41.4634%> (?)
unit	71.3338% <82.9268%> (-0.0166%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	42.0900% <ø> (+0.6665%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-21 13:29:30.284416194 +0000 UTC m=+2178324.041551766: ☑️ agreed by winoros.
• 2024-05-22 05:24:19.682274592 +0000 UTC m=+2235613.439410161: ☑️ agreed by time-and-fate.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: time-and-fate, winoros, XuHuaiyu

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Needs approval from an approver in each of these files:

• pkg/expression/OWNERS [XuHuaiyu]
• pkg/planner/OWNERS [time-and-fate,winoros]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #53475.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #53476.