**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.
```

Block sample_block_with_columns_to_add;
    //
    Block right_table_keys;
    //
    Block required_right_keys;
    //
    std::vector<String> required_right_keys_sources;
    Poco::Logger * log;
    Block totals;
    //
    //
    RWLockImpl::LockHolder storage_join_lock = nullptr;
    void dataMapInit(MapsVariant &);
    const Block & savedBlockSample() const { return data->sample_block; }
    //
    Block structureRightBlock(const Block & stored_block) const;
    void initRightBlockStructure(Block & saved_block_sample);
    template <ASTTableJoin::Kind KIND, ASTTableJoin::Strictness STRICTNESS, typename Maps>
    void joinBlockImpl(
        Block & block,
        const Block & block_with_columns_to_add,
        const std::vector<const Maps *> & maps_,
        bool is_join_get = false) const;
    void joinBlockImplCross(Block & block, ExtraBlockPtr & not_processed) const;
    static Type chooseMethod(const ColumnRawPtrs & key_columns, Sizes & key_sizes);
    bool empty() const;
    bool overDictionary() const;
};
}