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Nested field access on nullable structs discard parent nulls #25120
Description
Describe the bug
If we have a nested struct array, we only take the leaf nullability into account, instead of of an AND of all parent nullability.
To Reproduce
let inner_array = StructArray::new(
vec![Field::new("value", DataType::Int32, false)].into(),
vec![Arc::new(Int32Array::from(vec![1, 2, 3]))],
None,
);
// Only the outer struct marks row 1 as null; its children are all valid.
let outer_array = StructArray::new(
vec![Field::new("inner", inner_array.data_type().clone(), false)].into(),
vec![Arc::new(inner_array)],
Some(NullBuffer::from(vec![true, false, true])),
);If we try and get outer['inner']['value'], we currently get [1, 2, 3] instead of [1, null, 3].
Expected behavior
No response
Additional context
No response
Activity
AdamGS commentedon Sep 9, 2026
take
AdamGS commentedon Sep 13, 2026
@neilconway i think this is similar to some of the issues you filed recently
fix: Handle nulls correctly when extracting nested arrays from nullab…
fix: Handle nulls correctly when extracting nested arrays from nullab…
fix: Handle nulls correctly when extracting nested arrays from nullab…