abinash2553J commented on code in PR #11288:
URL: https://github.com/apache/arrow-rs/pull/11288#discussion_r4191769551
##########
arrow-data/src/transform/union.rs:
##########
@@ -77,23 +77,27 @@ pub(super) fn extend_nulls_dense(
let DataType::Union(fields, _) = &mutable.data_type else {
unreachable!()
};
- let first_type_id = fields
+ let null_type_id = fields
.iter()
- .next()
- .expect("union must have at least one field")
+ .find(|(_, field)| field.is_nullable())
+ .expect("cannot extend nulls in a union with no nullable field")
Review Comment:
I replaced the expect calls in the dense and sparse union null-extension
paths with ArrowError::InvalidArgumentError returns when no nullable child is
available to represent the null.
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