**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.
```

{
        switch (parent.data->type)
        {
        #define M(TYPE) \
            case HashJoin::Type::TYPE: \
                return fillColumns<STRICTNESS>(*maps.TYPE, columns_keys_and_right);
            APPLY_FOR_JOIN_VARIANTS(M)
        #undef M
            default:
                throw Exception("Unsupported JOIN keys. Type: " + toString(static_cast<UInt32>(parent.data->type)),
                                ErrorCodes::UNSUPPORTED_JOIN_KEYS);
        }
        __builtin_unreachable();
    }
    template <ASTTableJoin::Strictness STRICTNESS, typename Map>
    size_t fillColumns(const Map & map, MutableColumns & columns_keys_and_right)