HaoYang670 commented on issue #1642:
URL: https://github.com/apache/arrow-rs/issues/1642#issuecomment-1116731396
> I'm not actually entirely sure, the arrow specification doesn't seem to
describe the semantics of Map Arrays
`MapArray` seems like a logic type of `ListArray` whose child is a
`StructArray`.
```rust
/// [MapArray] is physically a [crate::array::ListArray] that has a
/// [crate::array::StructArray] with 2 child fields.
pub struct MapArray {
data: ArrayData,
values: ArrayRef,
value_offsets: RawPtrBox<i32>,
}
```
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