neilconway opened a new issue, #21210:
URL: https://github.com/apache/datafusion/issues/21210
### Describe the bug
```
CREATE TABLE t1(id INTEGER) AS VALUES (1), (2), (3);
CREATE TABLE t2(id INTEGER, outer_id INTEGER) AS VALUES (10, 1), (20, 1),
(30, 2);
SELECT
(SELECT count(*) AS c FROM t2 WHERE t2.outer_id = t1.id) + 1 AS a,
(SELECT count(*) AS c FROM t2 WHERE t2.outer_id = t1.id) + 2 AS b
FROM t1
ORDER BY t1.id;
```
Expected:
```
+---+---+
| a | b |
+---+---+
| 3 | 4 |
| 2 | 3 |
| 1 | 2 |
+---+---+
```
Actual:
```
+------+---+
| a | b |
+------+---+
| 3 | 4 |
| 2 | 3 |
| NULL | 2 |
+------+---+
```
Presumably because we don't do the count-compensation trick for both
subqueries.
### To Reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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