Jefffrey commented on PR #20469:
URL: https://github.com/apache/datafusion/pull/20469#issuecomment-3939817162
Does Spark return null (void) or an array of null (void)?
I tested on PySpark 4.1.1
```python
>>> spark.sql("select slice(NULL, 1, 2) as a").printSchema()
root
|-- a: array (nullable = true)
| |-- element: void (containsNull = true)
```
- Seems to suggest the latter?
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