jonahgao commented on issue #9506:
URL:
https://github.com/apache/arrow-datafusion/issues/9506#issuecomment-1987512263
I think ideally it should support any scalar expression.
In PostgreSQL, even functions and scalar subqueries are allowed.
```sh
psql=> select * from t limit (select * from t limit 1);
a
---
1
(1 row)
psql=> select * from t limit random() + 1;
a
---
1
(1 row)
```
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