JOIN should require ON condition #13486
Description
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