jonahgao commented on issue #11773:
URL: https://github.com/apache/datafusion/issues/11773#issuecomment-2301598463
After fixing that function, it will give the following error.
```sh
DataFusion CLI v41.0.0
> SELECT id, (SELECT * FROM UNNEST(arr) LIMIT 1) FROM
(
SELECT 1 id, array [1, 2] arr
UNION
SELECT 2 id, array [] arr
) rows;
This feature is not implemented: Physical plan does not support logical
expression ScalarSubquery(<subquery>)
```
Similar to `select (select * from values(a) limit 1) from (values(1) t(a))`.
DataFusion's current support for subqueries is limited, so fixing it might
require more work.
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