**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.
```

{
        auto mut_col = IColumn::mutate(std::move(col));
        ColumnLowCardinality * col_lc = assert_cast<ColumnLowCardinality *>(mut_col.get());
        if (col_lc->nestedIsNullable())
        {
            return mut_col;
        }
        else if (col_lc->nestedCanBeInsideNullable())
        {
            col_lc->nestedToNullable();
            return mut_col;
        }
    }
    else if (const ColumnConst * col_const = checkAndGetColumn<ColumnConst>(*col))
    {
        const auto & nested = col_const->getDataColumnPtr();
        if (nested->isNullable() || nested->canBeInsideNullable())
        {
            return makeNullable(col);
        }
        else if (nested->lowCardinality())
        {
            ColumnPtr nested_nullable = tryConvertColumnToNullable(nested);
            if (nested_nullable)
                return ColumnConst::create(nested_nullable, col_const->size());
        }
    }
    return nullptr;
}
void convertColumnToNullable(ColumnWithTypeAndName & column)