alamb commented on code in PR #8093:
URL: https://github.com/apache/arrow-rs/pull/8093#discussion_r2267990346
##########
parquet-variant-compute/src/variant_array.rs:
##########
@@ -488,4 +495,50 @@ mod test {
fn make_binary_array() -> ArrayRef {
Arc::new(BinaryArray::from(vec![b"test" as &[u8]]))
}
+
+ #[test]
+ fn all_null_shredding_state() {
+ let metadata = BinaryViewArray::from(vec![b"test" as &[u8]]);
+ let shredding_state = ShreddingState::try_new(metadata.clone(), None,
None).unwrap();
+
+ assert!(matches!(shredding_state, ShreddingState::AllNull { .. }));
+
+ // Verify metadata is preserved correctly
+ if let ShreddingState::AllNull { metadata: m } = shredding_state {
+ assert_eq!(m.len(), metadata.len());
+ assert_eq!(m.value(0), metadata.value(0));
+ }
+ }
+
+ #[test]
+ fn all_null_variant_array_construction() {
+ let metadata = BinaryViewArray::from(vec![b"test" as &[u8]; 3]);
+ let nulls = NullBuffer::from(vec![false, false, false]); // all null
Review Comment:
Are we sure that this case (where there is a `value` field present, but it
is all null) should be treated as though there was no `value` field?
I haven't double checked the spec (probably the Arrow one) but this feels
like it may be out of compliance
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