helgikrs opened a new issue #846:
URL: https://github.com/apache/arrow-rs/issues/846
Ipc serialization and deserialization of a column containing a dictionary
nested within a struct does not seem to work as expected right now. Here's a
small code snippet exhibiting that behavior.
```rust
use arrow::{
array::{self, ArrayRef, StructArray},
datatypes::{self, Field, Schema},
ipc::{reader::FileReader, writer::FileWriter},
record_batch::RecordBatch,
};
use std::sync::Arc;
fn main() {
// This works
// let inner: array::StringArray = vec![Some("a"), Some("b"),
Some("a")].into_iter().collect();
// This does not
let inner: array::DictionaryArray<datatypes::Int32Type> =
vec!["a", "b", "a"].into_iter().collect();
let array = Arc::new(inner) as ArrayRef;
let dctfield = Field::new("dict", array.data_type().clone(), false);
let s = StructArray::from(vec![(dctfield, array)]);
let struct_array = Arc::new(s) as ArrayRef;
let schema = Arc::new(Schema::new(vec![Field::new(
"struct",
struct_array.data_type().clone(),
false,
)]));
let batch = RecordBatch::try_new(schema.clone(),
vec![struct_array]).unwrap();
let mut buf = Vec::new();
let mut writer = FileWriter::try_new(&mut buf, &schema).unwrap();
writer.write(&batch).unwrap();
writer.finish().unwrap();
drop(writer);
let reader = FileReader::try_new(std::io::Cursor::new(buf)).unwrap();
let batch2: Result<Vec<_>, _> = reader.collect();
assert_eq!(batch, batch2.unwrap()[0]);
}
```
The code panics when the struct field is a dictionary, but works as expected
for other types.
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