feat: add serialization test for list element name and metadata support

[Swoorup]

No description provided.

[gooroo-dev]

Please double check the following review of the pull request:

🐞Mistake	🤪Typo	🚨Security	🚀Performance	💪Best Practices	📖Readability	❓Others
0	0	0	0	0	1	0

Changes in the diff

• ➕ Added a new test test_serialize_respects_list_element_name_and_metadata to verify serialization respects list element name and metadata attributes.
• ➕ Added a helper function align_struct_values in derive_struct.rs to cast struct field arrays to their expected data types during serialization.
• 🛠️ Integrated align_struct_values call in two places inside expand_serialize to ensure type alignment before creating StructArray.
• 📖 Used Rust's new pattern matching let ... else syntax in the test for better readability.

Identified Issues

ID	Type	Details	Severity	Confidence
1	💪Best Practices	In align_struct_values, panicking on cast failure may be harsh; better error handling or returning Result would be more robust. (arrow_convert_derive/src/derive_struct.rs lines 297-314)	🟡 Low	🟡 Low

---

Issue ID 1

Explanation

In arrow_convert_derive/src/derive_struct.rs (lines ~297-314), the function align_struct_values attempts to cast arrays to expected data types. If casting fails, it panics with a message. Panicking in procedural macros or serialization code can cause abrupt failures and poor error reporting.

Suggested fix

Change the function to return a Result<Vec<arrow::array::ArrayRef>, arrow::error::ArrowError> or a custom error type instead of panicking. Propagate the error upwards to allow graceful handling.

Code fix example

fn align_struct_values(
    values: Vec<arrow::array::ArrayRef>,
    fields: &arrow::datatypes::Fields,
) -> Result<Vec<arrow::array::ArrayRef>, arrow::error::ArrowError> {
    values
        .into_iter()
        .zip(fields.iter())
        .map(|(value, field)| {
            if value.data_type() == field.data_type() {
                Ok(value)
            } else {
                arrow::compute::cast(value.as_ref(), field.data_type()).map_err(|e| {
                    arrow::error::ArrowError::ComputeError(format!(
                        "failed to cast field '{}' from {:?} to {:?}: {}",
                        field.name(),
                        value.data_type(),
                        field.data_type(),
                        e
                    ))
                })
            }
        })
        .collect()
}

Then update call sites to handle the Result.

Explanation of the fix

This change avoids panics and allows the caller to handle errors properly, improving robustness and debuggability.

---

Missing tests

The added test in test_schema.rs covers the new feature well. No additional tests are strictly required.

---

Summary

The PR adds a useful test and improves serialization by aligning struct field arrays to expected types. The only recommendation is to avoid panics in align_struct_values and use error handling instead for better robustness. Otherwise, the changes are well-structured and clear.

Summon me to re-review when updated! Yours, Gooroo.dev
React or reply to let me know what you think!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.03%. Comparing base (51bd911) to head (f80f256).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   93.95%   94.03%   +0.07%     
==========================================
  Files          10       10              
  Lines        2018     2045      +27     
==========================================
+ Hits         1896     1923      +27     
  Misses        122      122              

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