helgikrs opened a new issue #862:
URL: https://github.com/apache/arrow-rs/issues/862
The `value_offsets` function on a union only returns the least significant
byte for the offset of a value, producing incorrect offsets when there are more
than 256 values.
```rust
use arrow::{
array::{UnionBuilder, Int32Array},
datatypes::Int32Type,
};
fn main() {
let mut builder = UnionBuilder::new_dense(300);
let values: Vec<_> = (0..300).collect();
values.iter().for_each(|v| builder.append::<Int32Type>("a",
*v).unwrap());
let union = builder.build().unwrap();
for i in 0..300 {
assert_eq!(union.value_offset(i), i as i32);
let slot = union.value(i);
let slot = slot.as_any().downcast_ref::<Int32Array>().unwrap();
assert_eq!(slot.len(), 1);
let value = slot.value(0);
assert_eq!(i as i32, value);
}
}
```
The above code fails for the 256th value index, returning 0 instead of 256
as expected.
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