fenfeng9 commented on issue #49740:
URL: https://github.com/apache/arrow/issues/49740#issuecomment-4689460246
A smaller reproduction case:
Casting short binary values to `binary_view` produces an array whose third
buffer slot is `None` (`[None, 32, None]`).
And `validate(full=True)` still succeeds, but `_export_to_c` segfaults when
exporting that null variadic buffer slot.
### Reproduce
```python
import ctypes
import platform
import pyarrow as pa
if __name__ == "__main__":
print(f"Python {platform.python_version()}, PyArrow {pa.__version__}",
flush=True)
print(flush=True)
arr = pa.array([b"a", b"e"], type=pa.binary())
print("binary array:", flush=True)
print(arr, flush=True)
print(
f"binary buffers : {[None if buf is None else buf.size for buf
in arr.buffers()]}",
flush=True,
)
arr = arr.cast(pa.binary_view())
print()
print("after cast to binary_view:", flush=True)
print(arr, flush=True)
print(
f"binary_view buffers : {[None if buf is None else buf.size for buf
in arr.buffers()]}",
flush=True,
)
arr.validate(full=True)
print("validate(full=True) : OK", flush=True)
print("_export_to_c : calling", flush=True)
out = ctypes.create_string_buffer(1024)
arr._export_to_c(ctypes.addressof(out))
print("_export_to_c : OK", flush=True)
```
### Result
```python
Python 3.12.13, PyArrow 24.0.0
binary array:
[
61,
65
]
binary buffers : [None, 12, 2]
after cast to binary_view:
[
61,
65
]
binary_view buffers : [None, 32, None]
validate(full=True) : OK
_export_to_c : calling
```
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