**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 structured_block;
    for (const auto & sample_column : savedBlockSample().getColumnsWithTypeAndName())
    {
        ColumnWithTypeAndName column = block.getByName(sample_column.name);
        if (sample_column.column->isNullable())
            JoinCommon::convertColumnToNullable(column);
        structured_block.insert(column);
    }
    return structured_block;
}
bool HashJoin::addJoinedBlock(const Block & source_block, bool check_limits)