jonahgao opened a new pull request, #9975:
URL: https://github.com/apache/arrow-datafusion/pull/9975
## Which issue does this PR close?
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Closes #9932.
## Rationale for this change
In a `GenericListArray`, the data in the `values` corresponding to a null
list may not be empty; it can be any data.
```rust
pub struct GenericListArray<OffsetSize: OffsetSizeTrait> {
data_type: DataType,
nulls: Option<NullBuffer>,
values: ArrayRef,
value_offsets: OffsetBuffer<OffsetSize>,
}
```
For example, in the description of [this
document](https://docs.rs/datafusion/latest/datafusion/common/arrow/array/struct.GenericListArray.html#representation),
the value of the null list is `?`, it's not empty.
In this situation, merely checking the `values` is unsafe, we must obtain
valid values based on the `value_offsets`.
## What changes are included in this PR?
- Fix bug in `unnest_generic_list`.
## Are these changes tested?
Yes
## Are there any user-facing changes?
No
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