pitrou commented on pull request #7519: URL: https://github.com/apache/arrow/pull/7519#issuecomment-651806049
Ok, at a quick glance, it seems that null container tests work properly
regardless:
```python
>>> s = set()
>>> s.add(pa.scalar(None))
>>> s
{<pyarrow.NullScalar: None>}
>>> pa.scalar(None) in s
True
>>> s.add(pa.scalar(None, pa.int64()))
>>> s.add(pa.scalar(12, pa.int64()))
>>> s
{<pyarrow.Int64Scalar: 12>,
<pyarrow.NullScalar: None>,
<pyarrow.Int64Scalar: None>}
>>> pa.scalar(None, pa.int64()) in s
True
>>> pa.scalar(None, pa.int32()) in s
False
```
```python
>>> l = [pa.scalar(None)]
>>> pa.scalar(None) in l
True
>>> pa.scalar(None, pa.int64()) in l
False
```
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