Fix merge panic

[XuPeng-SH]

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:

issue #18719 #18745 #18742

What this PR does / why we need it:

fix merge panic

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PR Type

Bug fix

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Description

• Removed unused imports from the merger.go file to clean up the code.
• Eliminated a section of code that checked for duplicate sort keys and logged a warning, which was unnecessary and could lead to a panic.

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Changes walkthrough 📝

	Relevant files
Bug fix	merger.go Remove unused imports and duplicate sort key check              pkg/vm/engine/tae/mergesort/merger.go Removed unused import of logutil and zap. Deleted a block of code that checked for duplicate sort keys and logged a warning. +1/-17

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PR Reviewer Guide 🔍

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Key issues to review Removed Warning The PR removes a block of code that checked for duplicate sort keys and logged a warning. This might impact the ability to detect and debug issues related to duplicate keys.

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PR Code Suggestions ✨

Category	Suggestion	Score
Error handling	Add error handling for potential failures in writer preparation Consider adding error handling for the PrepareNewWriter() call. If this method can potentially return an error, it should be checked and handled appropriately. pkg/vm/engine/tae/mergesort/merger.go [167-169] if m.writer == nil { - m.writer = m.host.PrepareNewWriter() + var err error + m.writer, err = m.host.PrepareNewWriter() + if err != nil { + return fmt.Errorf("failed to prepare new writer: %w", err) + } } Apply this suggestion Suggestion importance[1-10]: 9 Why: Adding error handling for the PrepareNewWriter() call is crucial for robust code, as it ensures that any potential errors are caught and managed, preventing unexpected behavior or crashes.	9
Context handling	Add a context check before preparing a new writer to handle potential cancellations Consider adding a context check before the PrepareNewWriter() call to ensure the operation hasn't been cancelled. pkg/vm/engine/tae/mergesort/merger.go [167-169] if m.writer == nil { + if err := ctx.Err(); err != nil { + return fmt.Errorf("context cancelled before preparing new writer: %w", err) + } m.writer = m.host.PrepareNewWriter() } Apply this suggestion Suggestion importance[1-10]: 8 Why: Adding a context check before the PrepareNewWriter() call is a good practice to handle potential cancellations, ensuring that resources are not unnecessarily allocated if the operation is no longer needed.	8