planner: refactor NewDistAggFunc for mpp agg aware of tipb's aggDesc execution mode

[AilinKid]

What problem does this PR solve?

Issue Number: close #50893

Problem Summary:

What changed and how does it work?

for this simple refactor work, the previous unit test is adequate, there is a concrete fix pull request next to fix explicit issues,

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 @AilinKid. Thanks for your PR.

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[codecov]

Codecov Report

Merging #50961 (d347446) into master (732fa8c) will increase coverage by 0.5658%.
Report is 32 commits behind head on master.
The diff coverage is 75.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #50961        +/-   ##
================================================
+ Coverage   72.2540%   72.8198%   +0.5657%     
================================================
  Files          1465       1467         +2     
  Lines        360889     439939     +79050     
================================================
+ Hits         260757     320363     +59606     
- Misses        80878      99508     +18630     
- Partials      19254      20068       +814     

Flag	Coverage Δ
integration	49.2294% <72.2222%> (?)
unit	70.3203% <66.6666%> (-1.8193%)	⬇️

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

Components	Coverage Δ
dumpling	54.1120% <ø> (-2.1513%)	⬇️
parser	∅ <ø> (∅)
br	51.2891% <ø> (+5.0081%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-04 08:37:35.132364874 +0000 UTC m=+86780.699134764: ☑️ agreed by hawkingrei.
• 2024-02-04 09:09:34.902591037 +0000 UTC m=+88700.469360928: ☑️ agreed by XuHuaiyu.

[AilinKid]

/test pull-mysql-client-test

[tiprow]

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/test pull-mysql-client-test

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[AilinKid]

/ok-to-test

[AilinKid]

/test check-dev

[tiprow]

@AilinKid: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

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Use /test all to run all jobs.

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/test check-dev

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