*: make default_authentication_plugin more compatible with mysql

[CbcWestwolf]

What problem does this PR solve?

Issue Number: close #54138

Problem Summary:

See the issue decription

What changed and how does it work?

Get default auth plugin when creating, altering and granting user.

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.

make `default_authentication_plugin` control default auth plugin when creating user

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[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.

Project coverage is 56.5109%. Comparing base (fa723c3) to head (fa4a9a1).
Report is 23 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56660         +/-   ##
=================================================
- Coverage   73.3500%   56.5109%   -16.8391%     
=================================================
  Files          1629       1756        +127     
  Lines        450090     635992     +185902     
=================================================
+ Hits         330141     359405      +29264     
- Misses        99710     252459     +152749     
- Partials      20239      24128       +3889     

Flag	Coverage Δ
integration	36.7710% <57.1428%> (?)
unit	72.4549% <42.8571%> (-0.0288%)	⬇️

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	52.3177% <ø> (+6.7383%)	⬆️

[dveeden]

I think the sha256 is confusing here as there used to be a sha256_password plugin.

Suggested change

	create user default_sha256_user;
	create user default_sha2_user;

(more modifications needed if you merge this)

[CbcWestwolf]

updated in fa4a9a1

[dveeden]

Maybe add something like set global default_authentication_plugin = 'xxxxx' to test the validation of the plugin name?

Maybe add statements like CREATE USER ... IDENTIFIED WITH ... to test if you can still create users with mysql_native_plugin when the default_authentication_plugin is set to caching_sha2_password?

[CbcWestwolf]

updated in fa4a9a1

[CbcWestwolf]

/retest

[tiprow]

@CbcWestwolf: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	fa4a9a1	link	true	/test fast_test_tiprow

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dveeden, lcwangchao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-21 09:13:14.007748369 +0000 UTC m=+255994.704538972: ☑️ agreed by lcwangchao.
• 2024-10-21 10:28:41.932716582 +0000 UTC m=+260522.629507193: ☑️ agreed by dveeden.