rishi-rana opened a new pull request, #39660:
URL: https://github.com/apache/shardingsphere/pull/39660

   Fixes #39359.
   
   Changes proposed in this pull request:
    - `CreateMaskRuleExecutor.checkDuplicatedRuleNames()`: copy current table 
names into a `CaseInsensitiveSet` instead of `Collectors.toList()`, so `CREATE 
MASK RULE T_ORDER` over an existing `t_order` now raises 
`DuplicateRuleException` instead of storing a duplicate.
    - `AlterMaskRuleExecutor.checkToBeAlteredRules()`: same fix, so `ALTER MASK 
RULE T_ORDER` no longer fails with `MissingRequiredRuleException` when only 
`t_order` exists.
    - `AlterMaskRuleExecutor.buildToBeDroppedRuleConfiguration()`: same fix for 
the `toBeAlteredTableNames` comparison, so a case-differing ALTER no longer 
leaves the old table's algorithm incorrectly counted as still in use.
    - Matches the existing `CaseInsensitiveSet` pattern already used in 
`DropMaskRuleExecutor` and applied to the sibling broadcast rule type in #39200.
    - Added case-insensitive unit test coverage to both executor test classes.
   
   This pull request was drafted with assistance from Claude Code (Anthropic). 
Affected scope: the three executor methods above and their corresponding unit 
tests in `CreateMaskRuleExecutorTest`/`AlterMaskRuleExecutorTest`. I reviewed 
and verified all changes myself.
   
   ---
   
   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 
Note](https://shardingsphere.apache.org/community/en/involved/contribute/contributor/)


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