erenavsarogullari commented on PR #20469:
URL: https://github.com/apache/datafusion/pull/20469#issuecomment-3941503978
Spark returns `Array as (nullable = true / false)` and there are 2
representations as follows in terms of `input array` so it returns input array
for both cases as either `NULL` or `[NULL]`:
**Case1:** input array is null (`array (nullable = true)`):
```
+-----------------+
|slice(NULL, 1, 2)|
+-----------------+
| NULL|
+-----------------+
root
|-- slice(NULL, 1, 2): array (nullable = true)
| |-- element: void (containsNull = true)
```
**Case2:** input array has null element (`array (nullable = false)`):
```
+------------------------+
|slice(array(NULL), 1, 2)|
+------------------------+
| [NULL]|
+------------------------+
root
|-- slice(array(NULL), 1, 2): array (nullable = false)
| |-- element: void (containsNull = true)
```
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