planner: remove useless todo comment and fix some typos for index merge

[AilinKid]

What problem does this PR solve?

Issue Number: close None

Problem Summary:

What is changed and how it works?

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.

planner: remove useless todo comment and fix some typos for index merge

[tiprow]

Hi @AilinKid. Thanks for your PR.

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[hawkingrei]

/ok-to-test

[codecov]

Codecov Report

Merging #46934 (3219fc8) into master (dc99d14) will decrease coverage by 0.6801%.
Report is 14 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46934        +/-   ##
================================================
- Coverage   73.3549%   72.6748%   -0.6801%     
================================================
  Files          1328       1352        +24     
  Lines        397004     403654      +6650     
================================================
+ Hits         291222     293355      +2133     
- Misses        87190      91663      +4473     
- Partials      18592      18636        +44     

Flag	Coverage Δ
integration	27.8065% <ø> (?)
unit	73.2917% <ø> (-0.0632%)	⬇️

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

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	84.9911% <ø> (-0.0108%)	⬇️
br	48.5539% <ø> (-4.3536%)	⬇️

[AilinKid]

/approve

[AilinKid]

/LGTM

[ti-chi-bot]

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In response to this:

/LGTM

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, Defined2014, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-13 05:04:55.587034703 +0000 UTC m=+61861.554622745: ☑️ agreed by hawkingrei.
• 2023-09-13 06:36:37.415882547 +0000 UTC m=+67363.383470582: ☑️ agreed by Defined2014.