util/collate, util/ranger: move and update IsPadSpaceCollation()

[time-and-fate]

What problem does this PR solve?

Issue Number: N/A

Problem Summary:

Since IsPadSpaceCollation was introduced into the planner originally, two new PAD SPACE collations have been supported by tidb.
Probably it's a proper time now to move this method to util/collate to be maintained by the SQL infra team.

Note that although the checking is wrong in recent versions, there are no correctness issues. There is just some unnecessary accessing and filtering.

What changed and how does it work?

• Update IsPadSpaceCollation() for the newly introduced utf8mb4_0900_* collations.
• Move IsPadSpaceCollation() from util/ranger to util/collate.

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

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: winoros, YangKeao

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• OWNERS [YangKeao,winoros]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-29 13:47:36.127407198 +0000 UTC m=+357568.966562745: ☑️ agreed by winoros.
• 2024-10-29 13:47:53.649774866 +0000 UTC m=+357586.488930396: ☑️ agreed by YangKeao.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.3328%. Comparing base (38e63a3) to head (5c329ce).
Report is 2 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56970         +/-   ##
=================================================
- Coverage   73.3059%   56.3328%   -16.9731%     
=================================================
  Files          1638       1764        +126     
  Lines        453782     632684     +178902     
=================================================
+ Hits         332649     356409      +23760     
- Misses       100773     252252     +151479     
- Partials      20360      24023       +3663     

Flag	Coverage Δ
integration	37.1711% <100.0000%> (?)
unit	72.5671% <80.0000%> (+0.0498%)	⬆️

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

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	52.6437% <ø> (+6.6448%)	⬆️