tustvold opened a new issue, #1726:
URL: https://github.com/apache/arrow-rs/issues/1726
**Describe the bug**
Whilst perusing the code I noticed that `GenericBinaryArray::from_list` and
`GenericBinaryArray::from_list` have the following logic
```
let mut builder = ArrayData::builder(Self::get_data_type())
.len(v.len())
.add_buffer(v.data_ref().buffers()[0].clone())
.add_buffer(v.data_ref().child_data()[0].buffers()[0].clone());
if let Some(bitmap) = v.data_ref().null_bitmap() {
builder = builder.null_bit_buffer(bitmap.bits.clone())
}
let data = unsafe { builder.build_unchecked() };
```
This does not propagate any offset that might be present in the source data
**To Reproduce**
I suspect if you slice an ArrayList and then pass it to this method, you
will lose the offset position.
**Expected behavior**
The offset, and probably the null count, should be preserved by both methods
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