Jefffrey commented on code in PR #7065:
URL: https://github.com/apache/arrow-rs/pull/7065#discussion_r1946592305
##########
arrow-cast/src/cast/list.rs:
##########
@@ -88,6 +88,25 @@ where
let mut mutable = MutableArrayData::new(vec![&values], nullable, cap);
// The end position in values of the last incorrectly-sized list slice
let mut last_pos = 0;
+
+ // Need to flag when previous vector(s) are empty/None to distinguish from
'All slices were correct length' cases.
+ let is_prev_empty = if array.offsets().len() < 2 {
+ false
+ } else {
+ let first_offset = array
+ .offsets()
+ .first()
+ .ok_or_else(|| ArrowError::ComputeError("Failed to get the first
offset".into()))?
+ .as_usize();
+ let second_offset = array
+ .offsets()
+ .get(1)
+ .ok_or_else(|| ArrowError::ComputeError("Failed to get the second
offset".into()))?
+ .as_usize();
Review Comment:
```suggestion
let first_offset = array.offsets()[0].as_usize();
let second_offset = array.offsets()[1].as_usize();
```
nit: safe to use index as case where len < 2 is guarded above, so it can't
panic
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