kawadakk opened a new issue, #7168:
URL: https://github.com/apache/arrow-rs/issues/7168
**Describe the bug**
`RowConverter::convert_columns` panics when encoding an array of type
`Struct([])`.
**To Reproduce**
```rust
#[test]
fn test_unit_struct() {
let s = Arc::new(StructArray::new_empty_fields(5, None)) as ArrayRef;
let sort_fields = vec![SortField::new(s.data_type().clone())];
let converter = RowConverter::new(sort_fields).unwrap();
let r = converter.convert_columns(&[Arc::clone(&s)]).unwrap();
let back = converter.convert_rows(&r).unwrap();
assert_eq!(back.len(), 1);
assert_eq!(&back[0], &s);
}
```
```
thread 'tests::test_unit_struct' panicked at arrow-row/src/lib.rs:881:9:
assertion failed: row + 1 < self.offsets.len()
```
**Expected behavior**
Not panicking
**Additional context**
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