privileges: user@'' is different with user@'%' | tidb-test=pr/2498

[Defined2014]

What problem does this PR solve?

Issue Number: close #33174

Problem Summary:
Previously, user@'' consider equals to user@'%' when performing operations related to set default role.

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
  Test link https://github.com/PingCAP-QE/tidb-test/pull/2498
• 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.

Fix `set default role` failed with empty hostname user.

[tiprow]

Hi @Defined2014. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 73.7758%. Comparing base (2f55858) to head (a18bb7f).
Report is 7 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #60082        +/-   ##
================================================
+ Coverage   73.1646%   73.7758%   +0.6112%     
================================================
  Files          1706       1706                
  Lines        471381     472572      +1191     
================================================
+ Hits         344884     348644      +3760     
+ Misses       105302     102809      -2493     
+ Partials      21195      21119        -76     

Flag	Coverage Δ
integration	42.9774% <0.0000%> (?)
unit	72.5905% <0.0000%> (+0.2266%)	⬆️

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Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	47.2618% <ø> (+0.0378%)	⬆️

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[Defined2014]

/retest

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[Defined2014]

/retest

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716, tiancaiamao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-03-16 10:33:29.670360246 +0000 UTC m=+178903.354596327: ☑️ agreed by lance6716.
• 2025-03-17 02:26:48.430717107 +0000 UTC m=+236102.114953202: ☑️ agreed by tiancaiamao.