findepi opened a new issue, #14352:
URL: https://github.com/apache/datafusion/issues/14352
### Describe the bug
Incorrect result for IS NOT NULL predicate over UNION ALL query
### To Reproduce
```sql
SELECT
a,
a IS NOT NULL
FROM (
SELECT 'foo' AS a, 3 AS b
UNION ALL
SELECT NULL AS a, 4 AS b
)
```
DF
```
+------+---------------+
| a | a IS NOT NULL |
+------+---------------+
| NULL | true | 😱
| foo | true |
+------+---------------+
```
### Expected behavior
`NULL` valued checked with `IS NOT NULL` should return `false`
```
trino> SELECT
-> a,
-> a IS NOT NULL
-> FROM (
-> SELECT 'foo' AS a, 3 AS b
-> UNION ALL
-> SELECT NULL AS a, 4 AS b
-> );
a | _col1
------+-------
foo | true
NULL | false
```
### Additional context
_No response_
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