timsaucer opened a new issue, #41833:
URL: https://github.com/apache/arrow/issues/41833
### Describe the bug, including details regarding any error messages,
version, and platform.
When creating an array from a python dict, field entries of a null struct
are initialized with default values rather than null even if their field is
nullable. In the minimal example below, you would expect the 3rd row to have
values of `inner_1` and `inner_2` to be null.
```
import pyarrow as pa
print(pa.array([
{"outer": {"inner_1": 1, "inner_2": 2}},
{"outer": {"inner_1": 3, "inner_2": None}},
{"outer": None},
]))
```
Generates the following output:
```
-- is_valid: all not null
-- child 0 type: struct<inner_1: int64, inner_2: int64>
-- is_valid:
[
true,
true,
false
]
-- child 0 type: int64
[
1,
3,
0
]
-- child 1 type: int64
[
2,
null,
0
]
```
### Component(s)
Python
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