**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.
```

{
        EMPTY,
        CROSS,
        DICT,
        #define M(NAME) NAME,
            APPLY_FOR_JOIN_VARIANTS(M)
        #undef M
    };
    /** Different data structures, that are used to perform JOIN.
      */
    template <typename Mapped>
    struct MapsTemplate
    {
        std::unique_ptr<FixedHashMap<UInt8, Mapped>>                  key8;
        std::unique_ptr<FixedHashMap<UInt16, Mapped>>                 key16;
        std::unique_ptr<HashMap<UInt32, Mapped, HashCRC32<UInt32>>>   key32;
        std::unique_ptr<HashMap<UInt64, Mapped, HashCRC32<UInt64>>>   key64;
        std::unique_ptr<HashMapWithSavedHash<StringRef, Mapped>>      key_string;
        std::unique_ptr<HashMapWithSavedHash<StringRef, Mapped>>      key_fixed_string;
        std::unique_ptr<HashMap<UInt128, Mapped, UInt128HashCRC32>>   keys128;
        std::unique_ptr<HashMap<UInt256, Mapped, UInt256HashCRC32>>   keys256;
        std::unique_ptr<HashMap<UInt128, Mapped, UInt128TrivialHash>> hashed;
        void create(Type which)