[ad-hoc] fda queries do not produce results with multiple columns with the same name

```sql
CREATE TABLE T(x INT, y INT) with ('materialized' = 'true');
CREATE TABLE S(x INT, y INT) with ('materialized' = 'true');
```

Following query in FDA shows only one column:

```
SELECT T.x, S.x FROM T, S WHERE T.y = S.y
```

![Image](https://github.com/user-attachments/assets/6400a5f8-7ed3-4239-8a78-b680d300b8ee)