mosalx opened a new issue, #35359:
URL: https://github.com/apache/arrow/issues/35359
### Describe the bug, including details regarding any error messages,
version, and platform.
Windows 10
python=3.11.2
pyarrow=11.0.0
```python
import pyarrow as pa
array = pa.array([None, None], type=pa.list_(pa.int32()))
array.flatten()
# Output:
<pyarrow.lib.Int32Array object at 0x000001EBA976FDC0>
[]
```
Same array but with fixed size raises `ArrowInvalid`
```python
array = pa.array([None, None], type=pa.list_(pa.int32(), list_size=1))
array.flatten()
# Output
---------------------------------------------------------------------------
ArrowInvalid Traceback (most recent call last)
Cell In[69], line 1
----> 1 array.flatten()
File
~\AppData\Local\miniconda3\envs\dev311_1\Lib\site-packages\pyarrow\array.pxi:1871,
in pyarrow.lib.BaseListArray.flatten()
File
~\AppData\Local\miniconda3\envs\dev311_1\Lib\site-packages\pyarrow\compute.py:239,
in _make_generic_wrapper.<locals>.wrapper(memory_pool, *args)
237 if args and isinstance(args[0], Expression):
238 return Expression._call(func_name, list(args))
--> 239 return func.call(args, None, memory_pool)
File
~\AppData\Local\miniconda3\envs\dev311_1\Lib\site-packages\pyarrow\_compute.pyx:355,
in pyarrow._compute.Function.call()
File
~\AppData\Local\miniconda3\envs\dev311_1\Lib\site-packages\pyarrow\error.pxi:144,
in pyarrow.lib.pyarrow_internal_check_status()
File
~\AppData\Local\miniconda3\envs\dev311_1\Lib\site-packages\pyarrow\error.pxi:100,
in pyarrow.lib.check_status()
ArrowInvalid: Must pass at least one array
```
Expected behavior: should return an empty array or, since fixed size lists
must allocate memory for null slots, should return an array of two nulls (equal
to `array.values`)
This issue may be related to the fix implemented for this issue:
https://issues.apache.org/jira/browse/ARROW-16174
### Component(s)
Python
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