21.5.1
```sql

create table test(d Date, k Int64, s String) 
Engine=MergeTree partition by (toYYYYMM(d),k) order by (d, k)

insert into test values ('2020-01-01', 1, '');
insert into test values ('2020-01-02', 1, '');

SELECT * FROM test WHERE d != '2020-01-01'
0 rows in set. Elapsed: 0.003 sec.


SELECT * FROM test WHERE identity(d) !=  '2020-01-01';
┌──────────d─┬─k─┬─s─┐
│ 2020-01-02 │ 1 │   │
└────────────┴───┴───┘

SELECT * FROM test WHERE toDate(d) != '2020-01-01';
┌──────────d─┬─k─┬─s─┐
│ 2020-01-02 │ 1 │   │
└────────────┴───┴───┘
```

return left;
        }
        if (type == Node::Type::Or)
        {
            
            if (left->type == Node::Type::False)
                return right;
            
            if (right->type == Node::Type::False)
                return left;
            
            if (left->type == Node::Type::True)
                return left;
            
            if (right->type == Node::Type::True)
                return right;
        }
        return std::make_unique<Node>(Node{
                .type = type,
                .left = std::move(left),
                .right = std::move(right)
            });
    };
    std::vector<Frame> rpn_stack;
    for (const auto & element : rpn)
    {
        if (element.function == RPNElement::FUNCTION_UNKNOWN)
        {
            auto can_be_true = std::make_unique<Node>(Node{.type = Node::Type::True});
            auto can_be_false = std::make_unique<Node>(Node{.type = Node::Type::True});