**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.
```

#pragma once
#include <variant>
#include <optional>
#include <shared_mutex>
#include <deque>
#include <vector>
#include <Parsers/ASTTablesInSelectQuery.h>
#include <Interpreters/IJoin.h>
#include <Interpreters/AggregationCommon.h>
#include <Interpreters/RowRefs.h>
#include <Common/Arena.h>
#include <Common/ColumnsHashing.h>
#include <Common/HashTable/HashMap.h>
#include <Common/HashTable/FixedHashMap.h>
#include <Common/RWLock.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <QueryPipeline/SizeLimits.h>
#include <Core/Block.h>
namespace DB
{
class TableJoin;