jorisvandenbossche commented on PR #35522:
URL: https://github.com/apache/arrow/pull/35522#issuecomment-1542036825
@pitrou small example using python (you don't actually need to filter or
slice yourself, since a scalar is already a slice into its parent array):
```
In [31]: arr1 = pa.array([[0, 1], [2, 3]])
In [32]: scalar1 = arr1[0]
In [33]: arr2 = pa.array([[0, 1], [2, None]])
In [34]: scalar2 = arr2[0]
In [35]: scalar1
Out[35]: <pyarrow.ListScalar: [0, 1]>
In [36]: scalar2
Out[36]: <pyarrow.ListScalar: [0, 1]>
In [37]: hash(scalar1)
Out[37]: 6972737373264176731
In [38]: hash(scalar2)
Out[38]: 5286180417804377197
In [39]: scalar1.values.buffers()
Out[39]:
[None,
<pyarrow.Buffer address=0x7fbc56a08200 size=32 is_cpu=True is_mutable=True>]
In [40]: scalar2.values.buffers()
Out[40]:
[<pyarrow.Buffer address=0x7fbc56a08180 size=1 is_cpu=True is_mutable=True>,
<pyarrow.Buffer address=0x7fbc56a08280 size=32 is_cpu=True is_mutable=True>]
```
Those two scalars are equal, so should have the same hash. But the one has a
validity bitmap, and the other not.
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