**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.
```

const std::vector<const Maps *> & mapv,
    AddedColumns & added_columns,
    HashJoin::Type type,
    JoinStuff::JoinUsedFlags & used_flags)
{
    constexpr bool is_asof_join = STRICTNESS == ASTTableJoin::Strictness::Asof;
    switch (type)
    {
    #define M(TYPE) \
        case HashJoin::Type::TYPE: \
            {                                                           \
            using MapTypeVal = const typename std::remove_reference_t<decltype(Maps::TYPE)>::element_type; \
            using KeyGetter = typename KeyGetterForType<HashJoin::Type::TYPE, MapTypeVal>::Type; \
            std::vector<const MapTypeVal*> a_map_type_vector(mapv.size()); \
            std::vector<KeyGetter> key_getter_vector;                     \
            for (size_t d = 0; d < added_columns.join_on_keys.size(); ++d)                   \
            {       \
                const auto & join_on_key = added_columns.join_on_keys[d];     \
                a_map_type_vector[d] = mapv[d]->TYPE.get();              \
                key_getter_vector.push_back(std::move(createKeyGetter<KeyGetter, is_asof_join>(join_on_key.key_columns, join_on_key.key_sizes))); \
            }                                                           \