neilconway opened a new issue, #23872:
URL: https://github.com/apache/datafusion/issues/23872
### Describe the bug
`SlidingMinAccumulator` reports a stale minimum when every non-`NULL` value
has been retracted from the window but the frame is still non-empty (i.e., the
frame contains only `NULL`s). Sliding max is correct.
### To Reproduce
```
SELECT id, x,
MIN(x) OVER (ORDER BY id ROWS BETWEEN 1 PRECEDING AND CURRENT ROW) AS
min_x
FROM (VALUES (1, 3), (2, NULL), (3, NULL)) t(id, x)
ORDER BY id;
```
==>
```
+----+------+-------+
| id | x | min_x |
+----+------+-------+
| 1 | 3 | 3 |
| 2 | NULL | 3 |
| 3 | NULL | 3 |
+----+------+-------+
```
### Expected behavior
```
+----+------+-------+
| id | x | min_x |
+----+------+-------+
| 1 | 3 | 3 |
| 2 | NULL | 3 |
| 3 | NULL | NULL |
+----+------+-------+
```
### Additional context
_No response_
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