planner: try fix scalar agg doesn't fully pushed down to tiFlash

[AilinKid]

What problem does this PR solve?

Issue Number: close https://github.com/pingcap/tidb/issues/50583

Problem Summary:

What changed and how does it work?

Check List

Tests

• [x] 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[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please ask for approval from ailinkid. For more information see the Kubernetes Code Review Process.

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[tiprow[bot]]

Hi @AilinKid. Thanks for your PR.

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 73.68421% with 5 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 76.0579%. Comparing base (c936265) to head (7791449). :warning: Report is 4245 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #50749        +/-   ##
================================================
+ Coverage   70.3332%   76.0579%   +5.7246%     
================================================
  Files          1456       1465         +9     
  Lines        420707     453503     +32796     
================================================
+ Hits         295897     344925     +49028     
+ Misses       104467      87915     -16552     
- Partials      20343      20663       +320     

Flag	Coverage Δ
integration	54.1042% <73.6842%> (?)

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Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	61.7908% <ø> (+11.2788%)	:arrow_up:

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[AilinKid]

/test unit-test

[tiprow[bot]]

@AilinKid: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test unit-test

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[AilinKid]

/test unit-test

[tiprow[bot]]

@AilinKid: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test unit-test

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[ti-chi-bot[bot]]

PR needs rebase.

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[ti-chi-bot[bot]]

@AilinKid: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	7791449d5c66bfa5d21bb7177dc47e9d96a54c40	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev_2	7791449d5c66bfa5d21bb7177dc47e9d96a54c40	link	true	/test check-dev2
pull-lightning-integration-test	7791449d5c66bfa5d21bb7177dc47e9d96a54c40	link	true	/test pull-lightning-integration-test
pull-integration-e2e-test	7791449d5c66bfa5d21bb7177dc47e9d96a54c40	link	true	/test pull-integration-e2e-test
pull-integration-realcluster-test-next-gen	7791449d5c66bfa5d21bb7177dc47e9d96a54c40	link	true	/test pull-integration-realcluster-test-next-gen
pull-unit-test-next-gen	7791449d5c66bfa5d21bb7177dc47e9d96a54c40	link	true	/test pull-unit-test-next-gen

Full PR test history. Your PR dashboard.

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