jorgecarleitao edited a comment on pull request #9301:
URL: https://github.com/apache/arrow/pull/9301#issuecomment-766163142
Now I get your point. On the PR description, I mention two _independent_
sources of unsoundness:
* we are using indices from null slots
* we are not performing bound checks on values.
In particular, the second point above allows the following code to run with
exit 0:
```rust
#[test]
fn test_bla() {
let indices = UInt32Array::from(vec![1, 10, 1000, 100000]);
let values = UInt32Array::from(vec![0, 1, 2, 3]);
let r = take(&values, &indices, None).unwrap();
println!("{:?}", r);
}
```
which yields a meaningless result because it is UB, even though it is marked
as `safe`.
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