add case for issue3302(1.2-dev).

[Ariznawlll]

User description

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

add case for query from information_schema.files

issue #https://github.com/matrixorigin/MO-Cloud/issues/3302

What this PR does / why we need it:

add case for query from information_schema.files

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PR Type

Tests

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Description

• Added a new test case to query information_schema.files and verified that it returns an empty set.
• Included a SQL query to select from information_schema.files with a limit of 1.

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Changes walkthrough 📝

Relevant files

Tests

system.result Add test case for querying information_schema.files            test/distributed/cases/system/system.result Added a new test case to query information_schema.files. Verified that the query returns an empty set. +2/-0      system.sql Add SQL query for information_schema.files                              test/distributed/cases/system/system.sql Added a SQL query to select from information_schema.files with a limit of 1. +1/-0

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PR Reviewer Guide 🔍

⏱️ Estimated effort to review [1-5]	1
🧪 Relevant tests	Yes
🔒 Security concerns	No
⚡ Key issues to review	None

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PR Code Suggestions ✨

Category	Suggestion	Score
Possible issue	Ensure the query returns an empty set in all environments or handle non-empty results Ensure that the query select * from information_schema.files limit 1; is expected to return an empty set in all environments. If this is not guaranteed, consider adding a condition to handle non-empty results. test/distributed/cases/system/system.result [7-8] select * from information_schema.files limit 1; +-- Ensure this query returns an empty set in all environments empty set Apply this suggestion Suggestion importance[1-10]: 7 Why: The suggestion correctly identifies a potential issue with the assumption that a query will always return an empty set, which might not be true in all environments. Adding a comment or handling for different outcomes is a good practice.	7
Maintainability	Add a comment to explain the purpose of the query for future maintainers Consider adding a comment to explain why the query select * from information_schema.files limit 1; is included, to provide context for future maintainers. test/distributed/cases/system/system.sql [3] +-- Check if the information_schema.files table is accessible select * from information_schema.files limit 1; Apply this suggestion Suggestion importance[1-10]: 6 Why: Adding a comment for clarity and context is beneficial for maintainability, especially for queries whose purpose might not be immediately obvious to future maintainers.	6