**Usage**
Postgres, MySQL, and Oracle support the expression `LEFT JOIN ... ON 1 = 1`, but ClickHouse does not.

It may be possible to replace `LEFT JOIN ... ON 1 = 1` with `CROSS JOIN`, but I want to use the query in the same form for lots of databases.

Please support the expression `LEFT JOIN ... ON 1 = 1`.


**Detailed SQL**
```SQL
CREATE TABLE test
(
    `name` Nullable(String),
    `id` int
)
ENGINE = Log();

insert into test values ('a', 1) ('b', 2) (null, 3);

select * from test t1 left join (select * from test ) t2 on 1 = 1   
-- DB::Exception: Not equi-join ON expression: 1 = 1. No columns in one of equality side.: While processing 1 = 1.
```

{
    NameSet required_columns(action_required_columns.begin(), action_required_columns.end());
    for (auto & column : requiredJoinedNames())
        if (!sample.has(column))
            required_columns.insert(column);
    return getNamesWithAliases(required_columns);
}
Block TableJoin::getRequiredRightKeys(const Block & right_table_keys, std::vector<String> & keys_sources) const
{
    NameSet required_keys = requiredRightKeys();
    Block required_right_keys;
    if (required_keys.empty())
        return required_right_keys;
    forAllKeys(clauses, [&](const auto & left_key_name, const auto & right_key_name)
    {
        if (required_keys.count(right_key_name) && !required_right_keys.has(right_key_name))
        {
            const auto & right_key = right_table_keys.getByName(right_key_name);
            required_right_keys.insert(right_key);
            keys_sources.push_back(left_key_name);
        }
        return true;
    });
    return required_right_keys;
}
bool TableJoin::leftBecomeNullable(const DataTypePtr & column_type) const