rustyconover opened a new issue, #44961:
URL: https://github.com/apache/arrow/issues/44961
### Describe the bug, including details regarding any error messages,
version, and platform.
When using the `pa.dataset.Expression` with the following code:
```python
>>> pc.equal(pc.count(pc.field("allergies"), mode="all"), 0)
<pyarrow.compute.Expression (count(allergies, {mode=ALL}) == 0)>
```
This expression correctly evaluates as `True` when there are no elements in
the `allergies` list column.
However, when attempting to use this expression to filter a dataset, the
following error occurs:
```
pyarrow.lib.ArrowInvalid: ExecuteScalarExpression cannot Execute non-scalar
expression (count(allergies, {mode=ALL}) == 0)
```
Could you clarify why this filtering expression cannot be used? It appears
to be a scalar expression, so I'm unsure why it results in this error. Any
guidance would be greatly appreciated!
### Component(s)
C++, Python
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