findepi opened a new issue, #13486:
URL: https://github.com/apache/datafusion/issues/13486
### Describe the bug
`SELECT ... FROM l JOIN r` is not a valid SQL query, the `ON` condition
should not be optional
### To Reproduce
```
DataFusion CLI v43.0.0
> SELECT * FROM (SELECT 1 AS id, 'Foo' AS name) l JOIN (SELECT 1 AS id,
'Bar' as name) r;
+----+------+----+------+
| id | name | id | name |
+----+------+----+------+
| 1 | Foo | 1 | Bar |
+----+------+----+------+
1 row(s) fetched.
```
### Expected behavior
The query should be rejected, the ON condition be requiered. In fact,
omitting it might be typo with dangerous consequences (expensive cross join).
### Trino
```
trino> SELECT * FROM (SELECT 1 AS id, 'Foo' AS name) l JOIN (SELECT 1 AS id,
'Bar' as name) r;
Query 20241119_124051_00000_rykay failed: line 1:87: mismatched input
'<EOF>'. Expecting: 'ON', 'USING'
SELECT * FROM (SELECT 1 AS id, 'Foo' AS name) l JOIN (SELECT 1 AS id, 'Bar'
as name) r <EOF>
```
### PostgresSQL
```
postgres=# SELECT * FROM (SELECT 1 AS id, 'Foo' AS name) l JOIN (SELECT 1 AS
id, 'Bar' as name) r;
ERROR: syntax error at or near ";"
LINE 1: ...id, 'Foo' AS name) l JOIN (SELECT 1 AS id, 'Bar' as name) r;
```
### DuckDB
```
D SELECT * FROM (SELECT 1 AS id, 'Foo' AS name) l JOIN (SELECT 1 AS id,
'Bar' as name) r;
Parser Error: syntax error at or near ";"
LINE 1: ... JOIN (SELECT 1 AS id, 'Bar' as name) r;
^
```
### Additional context
_No response_
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