kawadakk opened a new issue, #4643:
URL: https://github.com/apache/arrow-rs/issues/4643
**Describe the bug**
Encoding succeeds, but decoding fails with an error
`InvalidArgumentError("all columns in a record batch must have the specified
row count")`.
**To Reproduce**
```rust
// add to arrow-ipc/src/writer.rs
#[test]
fn ipc_struct_array_with_zero_fields() {
let record_batch = {
let struct_ty = DataType::Struct(Vec::<Field>::new().into());
let structs = ArrayDataBuilder::new(struct_ty.clone())
.len(3)
.build()
.unwrap();
RecordBatch::try_new_with_options(
Arc::new(Schema::new(vec![Field::new("field", struct_ty,
false)])),
vec![make_array(structs)],
&RecordBatchOptions::new().with_row_count(Some(3)),
)
.unwrap()
};
let deserialized_batch = deserialize(serialize(&record_batch));
let structs = deserialized_batch
.column(0)
.as_any()
.downcast_ref::<StructArray>()
.unwrap();
assert_eq!(structs.len(), 3);
}
```
```
thread 'writer::tests::ipc_struct_array_with_zero_fields' panicked at
'called `Result::unwrap()` on an `Err` value: InvalidArgumentError("all columns
in a record batch must have the specified row count")',
arrow-ipc\src\writer.rs:1816:39
stack backtrace:
0: rust_begin_unwind
at
/rustc/864bdf7843e1ceabc824ed86d97006acad6af643/library\std\src/panicking.rs:617:5
1: core::panicking::panic_fmt
at
/rustc/864bdf7843e1ceabc824ed86d97006acad6af643/library\core\src/panicking.rs:67:14
2: core::result::unwrap_failed
at
/rustc/864bdf7843e1ceabc824ed86d97006acad6af643/library\core\src/result.rs:1651:5
3: core::result::Result<T,E>::unwrap
at
/rustc/864bdf7843e1ceabc824ed86d97006acad6af643\library\core\src/result.rs:1076:23
4: arrow_ipc::writer::tests::deserialize
at .\src\writer.rs:1816:9
5: arrow_ipc::writer::tests::ipc_struct_array_with_zero_fields
at .\src\writer.rs:1976:34
6:
arrow_ipc::writer::tests::ipc_struct_array_with_zero_fields::{{closure}}
at .\src\writer.rs:1962:44
7: core::ops::function::FnOnce::call_once
at
/rustc/864bdf7843e1ceabc824ed86d97006acad6af643\library\core\src\ops/function.rs:250:5
8: core::ops::function::FnOnce::call_once
at
/rustc/864bdf7843e1ceabc824ed86d97006acad6af643/library\core\src\ops/function.rs:250:5
```
**Expected behavior**
Successful roundtrip conversion
**Additional context**
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