tustvold commented on issue #7119:
URL: https://github.com/apache/arrow-rs/issues/7119#issuecomment-2652226633

   Given that `Array::is_null` refers to logical_nulls, I think adding the 
below to `Array::logical_nulls` should be sufficient
   
   > 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:
   > Maybe also 
[StructArray::try_new](https://docs.rs/arrow/latest/arrow/array/struct.StructArray.html#method.try_new)?
   
   I'm not sure about the need for these, given this null buffer is literally 
just the null buffer for that StructArray, and makes no claims to the contrary. 
   
   I think what might help is adding a representation section, similar to we 
have for 
[ListArray](https://docs.rs/arrow-array/latest/arrow_array/array/struct.GenericListArray.html#representation)
 as added by @alamb in https://github.com/apache/arrow-rs/pull/7039. This could 
clearly show that null slots are arbitrary.


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