codephage2020 commented on code in PR #8093:
URL: https://github.com/apache/arrow-rs/pull/8093#discussion_r2270096080
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parquet-variant-compute/src/variant_array.rs:
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@@ -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:
I added a comprehensive test that demonstrates when a value field exists in
the schema but contains all null values, it correctly remains in the
Unshredded state rather than AllNull.
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