HaoYang670 commented on issue #1531:
URL: https://github.com/apache/arrow-rs/issues/1531#issuecomment-1098747941
We can design a situation where `substring by byte checked` is the best
choice:
Suppose we want to get the substrings with the **byte** length of the
shortest string in the array. We could do in this way by using the `length`
kernel and the `aggregation` kernel:
```rust
substring(string_array, start = 0, length = Some(min(length(string_array))))
```
Then, give an input `string_array` like this:
```rust
let input = [
"14 bytes 🗻",
"This string has 24 bytes",
"🗻 13 bytes"
];
```
We will get an invalid string array if using `substring by byte unchecked`,
which is dangerous.
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