scovich commented on issue #7119: URL: https://github.com/apache/arrow-rs/issues/7119#issuecomment-2652217498
> if you wanted to add a section documenting nested nullability, I'm sure that would be well received. For [`Array::is_null`](https://docs.rs/arrow/latest/arrow/array/trait.Array.html#method.is_null) and [`Array::logical_nulls`](https://docs.rs/arrow/latest/arrow/array/trait.Array.html#method.logical_nulls), something like: > WARNING: The logical nullability of a nested column is the union of logical nulls for all ancestors, which this method does not cover. See [`NullBuffer::union`](https://docs.rs/arrow/latest/arrow/buffer/struct.NullBuffer.html#method.union). [`StructArray::into_parts`](https://docs.rs/arrow/latest/arrow/array/struct.StructArray.html#method.into_parts) should also be straightforward, something like: > WARNING: The returned columns may contain physically non-null but logically invalid values, due to logically null ancestors -- including but not limited to the returned `NullBuffer`, which itself may also be incomplete for the same reason. Maybe also [`StructArray::try_new`](https://docs.rs/arrow/latest/arrow/array/struct.StructArray.html#method.try_new)? > NOTE: Physically non-null values in child columns can become logically NULL if masked by the provided `NullBuffer` -- even if they are non-nullable. Anywhere else? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
