kylebarron commented on issue #6151:
URL: https://github.com/apache/arrow-rs/issues/6151#issuecomment-2261554869
```rs
#[cfg(test)]
mod test {
use std::sync::Arc;
use arrow::array::ArrayDataBuilder;
use arrow_array::{make_array, Array, Int8Array, StructArray,
UInt64Array};
use arrow_schema::Field;
#[test]
fn test() {
let a = Arc::new(Int8Array::from(vec![1, 2, 3, 4]));
let b = Arc::new(UInt64Array::from(vec![1, 2, 3, 4]));
let fields = vec![
Field::new("a", a.data_type().clone(), true),
Field::new("b", b.data_type().clone(), true),
];
let original_struct_array = StructArray::new(fields.into(), vec![a,
b], None);
let array_data = original_struct_array.to_data();
let builder: ArrayDataBuilder = array_data.into();
// Set `offset` to 2
let offset_array_data = builder.offset(2).len(2).build().unwrap();
let reconstructed_struct_array = make_array(offset_array_data);
dbg!(&reconstructed_struct_array);
dbg!(original_struct_array.slice(2, 2));
}
}
```
This prints:
```
[arro3-core/src/constructors.rs:129:9] &reconstructed_struct_array =
StructArray
[
-- child 0: "a" (Int8)
PrimitiveArray<Int8>
[
1,
2,
3,
4,
]
-- child 1: "b" (UInt64)
PrimitiveArray<UInt64>
[
1,
2,
3,
4,
]
]
[arro3-core/src/constructors.rs:130:9] original_struct_array.slice(2, 2) =
StructArray
[
-- child 0: "a" (Int8)
PrimitiveArray<Int8>
[
3,
4,
]
-- child 1: "b" (UInt64)
PrimitiveArray<UInt64>
[
3,
4,
]
]
```
My understanding is that setting `offset` and `len` on the
`ArrayDataBuilder` **should** cause the same behavior as `.slice(2, 2)`
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