planner: remove fullRange check from skyline pruning (#63828)

[ti-chi-bot]

This is an automated cherry-pick of #63828

What problem does this PR solve?

Issue Number: ref #63235

Problem Summary:

What changed and how does it work?

FullRange check was found to be expensive in some scenarios. This PR will only call this after other criteria has been validated.

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

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

1. It must be approved by the approvers firstly.
2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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[ti-chi-bot]

@terry1purcell This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

@ti-chi-bot: ## If you want to know how to resolve it, please read the guide in TiDB Dev Guide.

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[terry1purcell]

/unhold

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release-8.1@e84f8af). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #64057   +/-   ##
================================================
  Coverage               ?   71.2450%           
================================================
  Files                  ?       1470           
  Lines                  ?     424556           
  Branches               ?          0           
================================================
  Hits                   ?     302475           
  Misses                 ?     101529           
  Partials               ?      20552           

Flag	Coverage Δ
unit	71.2450% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.5802% <0.0000%> (?)

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[fixdb]

+1

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fixdb, terry1purcell

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Needs approval from an approver in each of these files:

• pkg/planner/OWNERS [fixdb,terry1purcell]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-10-31 23:52:54.068774499 +0000 UTC m=+52024.911356164: ☑️ agreed by terry1purcell.
• 2025-11-01 01:05:43.948921928 +0000 UTC m=+56394.791503604: ☑️ agreed by fixdb.