liamzwbao opened a new issue, #9385:
URL: https://github.com/apache/arrow-rs/issues/9385
This pattern of creating a BooleanBuffer from with a length and then
filtering for nulls count is quite common (and becoming more so)
I wonder if we should (as a follow on PR) make a function to do it, maybe
like
```rust
let Option<NullBuffer> = NullBuffer::try_from_unsliced(b, array.len())
```
Then this code would look like
```rust
let nulls = array
.nulls()
.map(|n| n.inner().sliced())
.map(|b| NullBuffer::try_from_unsliced(b, array.len()
```
🤔
_Originally posted by @alamb in
https://github.com/apache/arrow-rs/pull/9338#discussion_r2766183359_
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