helgikrs opened a new issue #847:
URL: https://github.com/apache/arrow-rs/issues/847
A schema containing dictionary fields nested within structs does not
round-trip properly through FB serialization/deserialization.
Repro:
```rust
use arrow::{
datatypes::{DataType, Field, Schema},
ipc::{
self,
convert::{fb_to_schema, schema_to_fb},
},
};
use std::sync::Arc;
fn main() {
let schema = Arc::new(Schema::new(vec![Field::new(
"struct<dictionary<int32, utf8>>",
DataType::Struct(vec![Field::new(
"dictionary<int32, utf8>",
DataType::Dictionary(Box::new(DataType::Int32),
Box::new(DataType::Utf8)),
false,
)]),
false,
)]));
let fb = schema_to_fb(&schema);
let ipc = ipc::root_as_schema(fb.finished_data()).unwrap();
let schema2 = fb_to_schema(ipc);
assert_eq!(*schema, schema2);
}
```
```console
thread 'main' panicked at 'assertion failed: `(left == right)`
left: `Schema { fields: [Field { name: "struct<dictionary<int32, utf8>>",
data_type: Struct([Field { name: "dictionary<int32, utf8>", data_type:
Dictionary(Int32, Utf8), nullable: false, dict_id: 0, dict_is_ordered: false,
metadata: None }]), nullable: false, dict_id: 0, dict_is_ordered: false,
metadata: None }], metadata: {} }`,
right: `Schema { fields: [Field { name: "struct<dictionary<int32, utf8>>",
data_type: Struct([Field { name: "dictionary<int32, utf8>", data_type: Utf8,
nullable: false, dict_id: 0, dict_is_ordered: false, metadata: None }]),
nullable: false, dict_id: 0, dict_is_ordered: false, metadata: None }],
metadata: {} }`', src/main.rs:26:5
```
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