**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.
```

{
    if (dst_sample->lowCardinality())
    {
        MutableColumnPtr lc = dst_sample->cloneEmpty();
        if (const auto * nullable_col = typeid_cast<const ColumnNullable *>(column.get()))
            insertFromNullableOrDefault(lc, nullable_col);
        else
            typeid_cast<ColumnLowCardinality &>(*lc).insertRangeFromFullColumn(*column, 0, column->size());
        return lc;
    }
    return column->convertToFullColumnIfLowCardinality();
}
struct LowcardAndNull
{
    bool is_lowcard;
    bool is_nullable;
};
LowcardAndNull getLowcardAndNullability(const ColumnPtr & col)