planner: remove some unnecessary estimation code

[qw4990]

What problem does this PR solve?

Issue Number: ref #46358

Problem Summary: planner: remove some unnecessary estimation code

What is changed and how it works?

planner: remove some unnecessary estimation code

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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 @qw4990. Thanks for your PR.

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[hawkingrei]

/ok-to-test

[Rustin170506]

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-30 06:34:28.962810807 +0000 UTC m=+1908833.511826793: ☑️ agreed by hawkingrei.
• 2023-08-30 06:44:21.875754442 +0000 UTC m=+1909426.424770429: ☑️ agreed by hi-rustin.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, hawkingrei, hi-rustin

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[codecov]

Codecov Report

Merging #46498 (15a7f87) into master (d1483b8) will decrease coverage by 0.6633%.
Report is 6 commits behind head on master.
The diff coverage is 66.6666%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46498        +/-   ##
================================================
- Coverage   73.3755%   72.7123%   -0.6633%     
================================================
  Files          1303       1323        +20     
  Lines        394509     400708      +6199     
================================================
+ Hits         289473     291364      +1891     
- Misses        86640      90893      +4253     
- Partials      18396      18451        +55     

Flag	Coverage Δ
integration	25.6968% <44.4444%> (?)
unit	73.3880% <55.5555%> (+0.0124%)	⬆️

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

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	85.0638% <ø> (ø)
br	48.0297% <ø> (-4.3292%)	⬇️

[tiprow]

@qw4990: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
tiprow_fast_test	15a7f87	link	true	/test tiprow_fast_test

Full PR test history. Your PR dashboard.

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/test-infra repository. I understand the commands that are listed here.