case: adjust case describe and show

[DuanKuanJun]

Description

Please briefly describe the code changes in this pull request.

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @DuanKuanJun, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on improving the clarity, detail, and maintainability of the test suite. It achieves this by standardizing and expanding test case descriptions (docstrings) across a wide range of modules, making it easier for developers and reviewers to understand the purpose and execution flow of each test. A notable change is the comprehensive refactoring and relocation of the performance schema test case, which now includes more explicit steps and refined assertions. Additionally, the PR cleans up obsolete metadata from test files and updates the CI pipeline and documentation structure to reflect these changes.

Highlights

• Test Case Documentation Enhancement: Standardized and significantly expanded the docstrings (descriptions) for numerous test cases across various modules, including DataTypes, UDFs, Join Queries, Views, TSMAs, and RSMAs, providing clearer and more detailed steps for each test.
• Performance Schema Test Refactoring: The test_performance_schema.py file was refactored, relocated, and its test logic and assertions were updated. The test's docstring was completely rewritten to provide a comprehensive outline of its purpose and steps.
• Metadata Cleanup: Removed redundant Catalog: metadata entries from the docstrings of many test files, streamlining the test case definitions.
• CI and Documentation Updates: The continuous integration configuration (cases.task) was updated to include the refactored performance schema test, and the documentation navigation (mkdocs.yml) was cleaned up.

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[gemini-code-assist]

Code Review

This pull request primarily focuses on improving and cleaning up the docstrings of test cases. This includes removing obsolete "Catalog" sections and making the test descriptions more detailed and accurate. Several files are also reorganized, and documentation configuration files are updated accordingly. The changes significantly improve the clarity and maintainability of the test suite. I've found a couple of minor typos in the updated docstrings and have suggested corrections.