jorisvandenbossche commented on issue #44881:
URL: https://github.com/apache/arrow/issues/44881#issuecomment-2535241936
So a smaller reproducer:
```
In [99]: arr = pa.array([[{"key": None}, {"key": None}]])
In [100]: arr
Out[100]:
<pyarrow.lib.ListArray object at 0x7f15cdeeb760>
[
-- is_valid: all not null
-- child 0 type: null
2 nulls
]
In [101]: arr.cast(arr.type)
Out[101]:
<pyarrow.lib.ListArray object at 0x7f15c645f7c0>
<Invalid array: List child array invalid: Invalid: Struct child array #0 has
length smaller than expected for struct array (1 < 2)>
```
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