alamb commented on code in PR #7419:
URL: https://github.com/apache/arrow-rs/pull/7419#discussion_r2073617536
##########
arrow-row/src/lib.rs:
##########
@@ -1330,9 +1335,18 @@ fn encode_column(
.skip(1)
.enumerate()
.for_each(|(idx, offset)| {
- let (row, sentinel) = match array.is_valid(idx) {
- true => (rows.row(idx), 0x01),
- false => (*null, null_sentinel),
+ let (row, sentinel) = if array.is_valid(idx) {
+ let row = if rows.num_rows() == 0 {
Review Comment:
I am worried about adding a new test on each row of the conversion as that
may slow down things significantly
I think we could check if the input array's size was greater than zero and
just ignore the offsets if not
```rust
let array = as_struct_array(column);
if array.len() == 0 {
return OK(())
}
```
Or something
##########
arrow-row/src/lib.rs:
##########
@@ -2539,4 +2553,17 @@ mod tests {
let rows = converter.convert_columns(&[Arc::new(a) as _]).unwrap();
assert_eq!(rows.row(0).cmp(&rows.row(1)), Ordering::Less);
}
+
+ #[test]
+ fn test_empty_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);
+ }
Review Comment:
Can you also verify we have tests covering empty arrays of other offset
based types (such as ListArray, StringArray, etc) ?
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