fix: error handling in Iterator.Next() method

[DeVikingMark]

This PR fixes the error handling in the Iterator.Next() method by properly storing the error in the iter.err field, similar to how it's done in FastIterator.

The TODO comment "double-check if this error is correctly handled" has been addressed by adding code to store the error in the iter.err field when an error occurs during the traversal.next() call.

This ensures that the error can be properly retrieved later via the Error() method, maintaining consistency with other iterator implementations in the codebase.

Summary by CodeRabbit

• Bug Fixes
  • Enhanced error management during processing so that issues are now captured and reported more reliably, improving overall system stability and the user experience.

[coderabbitai]

Walkthrough

The changes update the Next method in iterator.go by adding explicit error handling. After calling iter.t.next(), the code now checks if an error is returned and, if so, assigns it to iter.err. This ensures that any errors during iteration are captured properly. There are no modifications to the public API.

Changes

File	Change Summary
iterator.go	Updated the Next method: introduced a conditional check for errors returned from iter.t.next(), storing any encountered error in iter.err.

Sequence Diagram(s)

sequenceDiagram
    participant Client as Client
    participant Iterator as Iterator
    participant T as iter.t
    Client->>Iterator: Call Next()
    Iterator->>T: Call next()
    alt Error encountered
        T-->>Iterator: Return error
        Iterator->>Iterator: Set iter.err with error
        Iterator-->>Client: Return error state
    else No error
        T-->>Iterator: Return next item
        Iterator-->>Client: Return next item
    end

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Suggested reviewers

• julienrbrt

Poem

I hopped through codes and fields so bright,
Chasing bugs in the pale moonlight,
Now errors, once sly, have been tamed with care,
In my burrow of code, all is fair,
A happy rabbit sings a debug delight! 🐇💻

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📥 Commits

Reviewing files that changed from the base of the PR and between 0bce70d and bad6f16.

📒 Files selected for processing (1)

• iterator.go (1 hunks)

🔇 Additional comments (1)

iterator.go (1)

230-239: Good improvement to error handling.

The changes properly store any errors from iter.t.next() into iter.err, ensuring that errors during iteration can be retrieved later through the Error() method. This aligns with other iterator implementations in the codebase and improves error reporting for consumers of this API.

✨ Finishing Touches

• 📝 Generate Docstrings

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