**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.
```

{
        return getUsedSafe(nullptr, i);
    }
    
    bool JoinUsedFlags::getUsedSafe(const Block * block_ptr, size_t row_idx) const
    {
        if (auto it = flags.find(block_ptr); it != flags.end())
            return it->second[row_idx].load();
        return !need_flags;
    }
    
    template <ASTTableJoin::Kind KIND, ASTTableJoin::Strictness STRICTNESS>
    void JoinUsedFlags::reinit(size_t size)
    {
        if constexpr (MapGetter<KIND, STRICTNESS>::flagged)
        {
            assert(flags[nullptr].size() <= size);
            need_flags = true;
            flags[nullptr] = std::vector<std::atomic_bool>(size);
        }
    }
    
    template <ASTTableJoin::Kind KIND, ASTTableJoin::Strictness STRICTNESS>
    void JoinUsedFlags::reinit(const Block * block_ptr)