kawadakk opened a new issue, #7169:
URL: https://github.com/apache/arrow-rs/issues/7169
**Describe the bug**
`RowConverter::convert_rows` flattens all dictionary arrays, but the
`data_type` of the returned array still contain `Dictionary`.
**To Reproduce**
```rust
#[test]
fn test_dictionary_in_struct() {
let ty = DataType::Struct(
vec![Field::new_dictionary(
"foo",
DataType::Int32,
DataType::Int32,
false,
)]
.into(),
);
let s = arrow_array::new_empty_array(&ty);
let sort_fields = vec![SortField::new(s.data_type().clone())];
let converter = RowConverter::new(sort_fields).unwrap();
let r = converter.convert_columns(&[Arc::clone(&s)]).unwrap();
let back = converter.convert_rows(&r).unwrap();
let [s2] = back.try_into().unwrap();
assert_eq!(&s2, &s);
println!("s2 = {s2:?}, s2.ty = {}", s2.data_type());
s2.to_data().validate_full().unwrap();
}
```
```
s2 = StructArray
-- validity:
[
]
[
-- child 0: "foo" (Int32)
PrimitiveArray<Int32>
[
]
], s2.ty = Struct([Field { name: "foo", data_type: Dictionary(Int32, Int32),
nullable: false, dict_id: 0, dict_is_ordered: false, metadata: {} }])
thread 'tests::test_dictionary_in_struct' panicked at
arrow-row/src/lib.rs:1884:38:
called `Result::unwrap()` on an `Err` value: InvalidArgumentError("Child
type mismatch for Struct([Field { name: \"foo\", data_type: Dictionary(Int32,
Int32), nullable: false, dict_id: 0, dict_is_ordered: false, metadata: {} }]).
Expected Dictionary(Int32, Int32) but child data had Int32")
```
**Expected behavior**
- The decoded array passes validation
- One of the following is true:
- The first child of `s2` is `DictionaryArray`, and the first subfield
of `s2.data_type()` is `Dictionary(_, Int32)`.
- The first child of `s2` is `Int32Array`, and the first subfield of
`s2.data_type()` is `Int32`.
**Additional context**
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Add any other context about the problem here.
-->
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