planner: use logical cores as default fine grained stream count (#55544)

[ti-chi-bot]

This is an automated cherry-pick of #55544

What problem does this PR solve?

Issue Number: close #55543

Problem Summary:
As the issue described.

What changed and how does it work?

Use logical cores as default fine grained stream count

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

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.5@9e7f354). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #55576   +/-   ##
================================================
  Coverage               ?   72.0008%           
================================================
  Files                  ?       1413           
  Lines                  ?     411698           
  Branches               ?          0           
================================================
  Hits                   ?     296426           
  Misses                 ?      95376           
  Partials               ?      19896           

Flag	Coverage Δ
unit	72.0008% <66.6666%> (?)

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

Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.5307% <0.0000%> (?)

[windtalker]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [hawkingrei,windtalker]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-22 06:00:53.890574456 +0000 UTC m=+418049.025024576: ☑️ agreed by windtalker.
• 2024-08-22 06:01:54.092360238 +0000 UTC m=+418109.226810359: ☑️ agreed by hawkingrei.