alamb commented on code in PR #14360:
URL: https://github.com/apache/datafusion/pull/14360#discussion_r1934250018
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datafusion/physical-plan/src/aggregates/group_values/single_group_by/primitive.rs:
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@@ -166,10 +165,12 @@ where
null_idx: Option<usize>,
) -> PrimitiveArray<T> {
let nulls = null_idx.map(|null_idx| {
- let mut buffer = BooleanBufferBuilder::new(values.len());
- buffer.append_n(values.len(), true);
- buffer.set_bit(null_idx, false);
- unsafe { NullBuffer::new_unchecked(buffer.finish(), 1) }
+ let mut buffer = NullBufferBuilder::new(values.len());
+ buffer.append_n_non_nulls(null_idx);
+ buffer.append_null();
+ buffer.append_n_non_nulls(values.len() - null_idx - 1);
+ // SAFETY: The inner builder must be constructed
Review Comment:
"SAFETY" is typically used to justify the use of `unsafe`
Since this is not `unsafe` (`unwrap()` will panic not lead to undefined
behavior) I think we should use a different tag here
```suggestion
// NOTE: The inner builder must be constructed as there is
at least one null
```
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