[Python] Failing to create array from null scalar

[alexeykudinkin]

Describe the bug, including details regarding any error messages, version, and platform.

Following code fails unexpectedly:

import pyarrow as pa


s = pa.scalar(None, type=pa.list_(pa.int64()))
arr = pa.array([s])

Component(s)

Python

[AlenkaF]

A bit confusing, I know, but one pair of square brackets is missing. This should work:

In [1]: import pyarrow as pa
   ...: 
   ...: s = pa.scalar([None], type=pa.list_(pa.int64()))
   ...: pa.array([s])
Out[1]: 
<pyarrow.lib.ListArray object at 0x10e720520>
[
  [
    null
  ]
]