findepi opened a new issue, #16137:
URL: https://github.com/apache/datafusion/issues/16137
### Is your feature request related to a problem or challenge?
This is perfectly valid use of scalar subquery without aggregation.
This should work in DataFusion
```sql
WITH src AS (
SELECT *
FROM (VALUES
(1, NULL, 'Europe'),
(2, 1, 'Warsaw'),
(3, 1, 'Paris')
) t(id, parent_id, name)
)
SELECT
id,
name,
(SELECT p.name FROM src p WHERE p.id = s.parent_id) AS parent_name
FROM src s;
```
Currently this fails with
```
Invalid (non-executable) plan after Analyzer
caused by
Error during planning: Correlated scalar subquery must be aggregated to
return at most one row
```
### Describe the solution you'd like
_No response_
### Describe alternatives you've considered
_No response_
### Additional context
- https://github.com/apache/datafusion/issues/16134
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