milesgranger commented on code in PR #13894:
URL: https://github.com/apache/arrow/pull/13894#discussion_r955899236
##########
python/pyarrow/tests/test_array.py:
##########
@@ -919,6 +919,53 @@ def test_list_from_arrays(list_array_type,
list_type_factory):
list_array_type.from_arrays(offsets, values, type=typ)
[email protected](('list_array_type', 'list_type_factory'), (
+ (pa.ListArray, pa.list_),
+ (pa.LargeListArray, pa.large_list)
+))
[email protected]("arr", (
+ [None, [0]],
+ [None, [0, None], [0]],
+ [[0], [1]],
+))
+def test_list_array_types_from_arrays(
+ list_array_type, list_type_factory, arr
+):
+ arr = pa.array(arr, list_type_factory(pa.int8()))
+ reconstructed_arr = list_array_type.from_arrays(
+ arr.offsets, arr.values, mask=arr.is_null())
+ assert arr == reconstructed_arr
Review Comment:
Doesn't appears so:
```python
In [1]: import pyarrow as pa
In [2]: arr = pa.array([[0], None, [0, None], [0]], pa.list_(pa.int8()))
In [3]: arr = arr[1:]
In [4]: reconstructed_arr = pa.ListArray.from_arrays(arr.offsets,
arr.values, mask=arr.is_null())
In [5]: arr == reconstructed_arr
Out[5]: False
In [6]: arr
Out[6]:
<pyarrow.lib.ListArray object at 0x7f85d8375e20>
[
null,
[
0,
null
],
[
0
]
]
In [7]: reconstructed_arr
Out[7]:
<pyarrow.lib.ListArray object at 0x7f85a031c580>
[
[],
[
0,
null
],
null
]
In [8]:
```
Maybe it's somewhat related to
[ARROW-16174](https://issues.apache.org/jira/browse/ARROW-16174)?
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