thswlsqls opened a new pull request, #39361:
URL: https://github.com/apache/shardingsphere/pull/39361

   Fixes #39359.
   
   Changes proposed in this pull request:
     - Collect current mask table names into `CaseInsensitiveSet` in 
`CreateMaskRuleExecutor.checkDuplicatedRuleNames()`, so `CREATE MASK RULE 
T_ORDER` on an existing `t_order` is rejected as duplicate instead of 
persisting a second table node.
     - Collect current mask table names into `CaseInsensitiveSet` in 
`AlterMaskRuleExecutor.checkToBeAlteredRules()`, so `ALTER MASK RULE T_ORDER` 
on an existing `t_order` is no longer rejected as missing.
     - Collect altered table names into `CaseInsensitiveSet` in 
`AlterMaskRuleExecutor.buildToBeDroppedRuleConfiguration()`, so the altered 
table's stale algorithm is dropped instead of staying counted as in use.
     - Reuses the idiom already used by `DropMaskRuleExecutor` in the same 
module; `MaskRule.tables` is a `CaseInsensitiveMap` and `ShowMaskRuleExecutor` 
already matches with `equalsIgnoreCase`, so create and alter were the only 
case-sensitive paths left.
     - Completes #32755, which made mask show and drop case-insensitive but 
left create and alter; #39200 applied the same fix to broadcast.
     - Adds one regression test per site; all three fail before this change.
   
   ---
   
   Before committing this PR, I'm sure that I have checked the following 
options:
   - [x] My code follows the [code of 
conduct](https://shardingsphere.apache.org/community/en/involved/conduct/code/) 
of this project.
   - [x] I have self-reviewed the commit code.
   - [ ] I have (or in comment I request) added corresponding labels for the 
pull request.
   - [x] I have passed maven check locally : `./mvnw clean install -B -T1C 
-Dmaven.javadoc.skip -Dmaven.jacoco.skip -e`.
   - [ ] I have made corresponding changes to the documentation.
   - [x] I have added corresponding unit tests for my changes.
   - [x] I have updated the Release Notes of the current development version. 
For more details, see [Update Release 
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