fpacanowski opened a new issue, #44918:
URL: https://github.com/apache/arrow/issues/44918
### Describe the bug, including details regarding any error messages,
version, and platform.
`RecordBatchBuilder` doesn't seem to correctly handle a schema that contains
a list of structs. Here's a minimal test case:
```ruby
schema = Arrow::Schema.new(
[
Arrow::Field.new("structs", Arrow::ListDataType.new(
Arrow::StructDataType.new([
Arrow::Field.new("foo", :int64),
Arrow::Field.new("bar", :int64)
])
))
]
)
table = Arrow::RecordBatchBuilder.build(schema, [
{ structs: [] },
{ structs: [] },
]).to_table
assert_equal(2, table.n_rows)
```
Table should have 2 rows, but it's empty (tested on HEAD).
I've also checked that equivalent code in PyArrow works correctly (the table
has two rows):
```python
import pyarrow as pa
import pyarrow.parquet as pq
schema = pa.schema(
[
pa.field(
"structs",
pa.list_(
pa.struct([
pa.field("foo", pa.int64()),
pa.field("bar", pa.int64())
])
)
)
]
)
data = [
{"structs": []},
{"structs": []}
]
table = pa.Table.from_pylist(data, schema=schema)
print(table.shape)
pq.write_table(table, "file.parquet")
```
Related bug report: https://github.com/apache/arrow/issues/44742.
### Component(s)
Ruby
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