spenczar opened a new issue, #35624:
URL: https://github.com/apache/arrow/issues/35624
### Describe the bug, including details regarding any error messages,
version, and platform.
Suppose you have a fixed-sized list array with null values:
```py
array = pa.nulls(3, pa.list_(pa.float64(), 2))
print(array)
# [
# null,
# null,
# null
#]
```
How do you fill the nulls? Like, maybe I want it to look like `[[null,
null], [null, null], [null, null]]`. Or even `[[0, 0], [0, 0], [0, 0]]`.
You can't call `fill_null` with a pyarrow array value, because the arrays
don't have an '`as_py`' method:
```py
array.fill_null(pa.array([0.0, 0.0]))
```
```
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "pyarrow/array.pxi", line 1296, in pyarrow.lib.Array.fill_null
File
"/Users/swnelson/scratch/.arrow-venv/lib/python3.11/site-packages/pyarrow/compute.py",
line 523, in fill_null
fill_value = pa.scalar(fill_value.as_py(), type=values.type)
^^^^^^^^^^^^^^^^
AttributeError: 'pyarrow.lib.DoubleArray' object has no attribute 'as_py'
```
But you _can_ do it with a plain old Python list!
```py
array.fill_null([0.0, 0.0])
```
```
<pyarrow.lib.FixedSizeListArray object at 0x135647460>
[
[
0,
0
],
[
0,
0
],
[
0,
0
]
]
```
This seems like an oversight. If I give an array of the right shape, surely
it should be permitted.
### Component(s)
Python
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