**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.
```

{
    std::vector<std::string> text;
    for (const auto & [k, v] : target)
    {
        auto src_type_it = source.find(k);
        std::string src_type_name = src_type_it != source.end() ? src_type_it->second->getName() : "";
        text.push_back(fmt::format("{} : {} -> {}", k, src_type_name, v->getName()));
    }
    return fmt::format("{}", fmt::join(text, ", "));
}
}
namespace
{
struct BothSidesTag {};
struct LeftSideTag {};
struct RightSideTag {};
template <typename SideTag = BothSidesTag, typename OnExpr, typename Func>
bool forAllKeys(OnExpr & expressions, Func callback)