executor: 'alter user' requires 'CREATE USER' privilege in most cases

[tiancaiamao]

What problem does this PR solve?

Issue Number: close #59677

Problem Summary:

What changed and how does it work?

In most cases, 'alter user' statement requires 'CREATE USER' privilege.

Before this fix, if a user 'alter user' for himself, there is no privilege check.
But that should be very limited cases.

Tested with mysql, even "alter user current_user() comment 'xxx'" requires privilege check.

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

[tiprow]

Hi @tiancaiamao. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.3737%. Comparing base (87f6782) to head (c2ee53d).
Report is 5 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59756        +/-   ##
================================================
+ Coverage   72.9647%   73.3737%   +0.4090%     
================================================
  Files          1697       1697                
  Lines        468950     469432       +482     
================================================
+ Hits         342168     344440      +2272     
+ Misses       105711     103933      -1778     
+ Partials      21071      21059        -12     

Flag	Coverage Δ
integration	42.7941% <100.0000%> (?)
unit	72.1747% <100.0000%> (+0.0039%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	45.1163% <ø> (ø)

[bb7133]

Please add the description for this PR, the rest LGTM

[bb7133]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-25 18:46:50.374443187 +0000 UTC m=+381558.327601453: ☑️ agreed by bb7133.