danhhz opened a new issue, #6086:
URL: https://github.com/apache/arrow-rs/issues/6086
**Describe the bug**
It seems that a BinaryViewArray of a single `Some(&[])` comes back as `None`
(null) after being roundtripped through parquet. A non-empty byte slice, such
as `Some(&[1])` works, however.
**To Reproduce**
Using version 52.1.0
```
#[test]
fn binary_view_bug() {
#[track_caller]
fn roundtrips(x: &[u8]) {
let before = BinaryViewArray::from(vec![x]);
let batch =
RecordBatch::try_from_iter(vec![("val", Arc::new(before.clone())
as ArrayRef)])
.unwrap();
let mut buf = Vec::new();
let mut writer = ArrowWriter::try_new(&mut buf, batch.schema(),
None).unwrap();
writer.write(&batch).unwrap();
writer.close().unwrap();
let builder =
ParquetRecordBatchReaderBuilder::try_new(Bytes::from(buf)).unwrap();
let mut reader = builder.build().unwrap();
let batch = reader.next().unwrap().unwrap();
let after = batch.columns()[0].as_binary_view();
assert_eq!(
before.iter().collect::<Vec<_>>(),
after.iter().collect::<Vec<_>>()
);
}
roundtrips(&[1]); // This one works
roundtrips(&[]); // This one fails
}
```
The output on failure is
```
assertion `left == right` failed
left: [Some([])]
right: [None]
```
**Expected behavior**
The value should be `Some([])` on decode.
**Additional context**
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