loop

SELECT ... FROM loop(database, table);
SELECT ... FROM loop(database.table);
SELECT ... FROM loop(table);
SELECT ... FROM loop(other_table_function(...));

SELECT * FROM loop(test_database, test_table);
SELECT * FROM loop(test_database.test_table);
SELECT * FROM loop(test_table);

SELECT * FROM loop(numbers(3)) LIMIT 7;
   ┌─number─┐
1. │      0 │
2. │      1 │
3. │      2 │
   └────────┘
   ┌─number─┐
4. │      0 │
5. │      1 │
6. │      2 │
   └────────┘
   ┌─number─┐
7. │      0 │
   └────────┘

SELECT * FROM loop(mysql('localhost:3306', 'test', 'test', 'user', 'password'));
...