westonpace opened a new issue, #35450:
URL: https://github.com/apache/arrow/issues/35450
### Describe the bug, including details regarding any error messages,
version, and platform.
I'm not entirely certain if it's legal for a record batch to be shorter than
its child arrays. However, if it is, then ToStructArray is not working
properly.
```
TEST_F(TestRecordBatch, SlicedToStructArray) {
std::shared_ptr<Array> x_arr = ArrayFromJSON(int64(), "[0, 1, 2, 3, 4, 5,
6, 7, 8, 9]");
auto batch = RecordBatch::Make(::arrow::schema({field("x", int64())}), 5,
{x_arr});
ASSERT_EQ(batch->num_rows(), 5); // This works
ASSERT_OK_AND_ASSIGN(auto struct_array, batch->ToStructArray());
ASSERT_EQ(struct_array->length(), 5); // This fails
}
```
### Component(s)
C++
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