```sql

drop table if exists t ;
drop table if exists temp ;

CREATE TABLE t
(
    game String,
    round String,
    casino Int32)
ENGINE = MergeTree() ORDER BY (casino, game, round);

CREATE TABLE temp
(
    game String,
    round String,
    casino Int32)
ENGINE = MergeTree() ORDER BY (casino, game, round);

insert into t(casino, game, round)
select number%103, toString(cityHash64(number%999)), toString(number) from numbers(3, 50000000);

insert into temp(casino, game, round)
select number%103, toString(cityHash64(number%999)), toString(number) from numbers(5000);

Q1: SELECT count(*)
FROM temp WHERE (casino, game, round) NOT IN
(     SELECT  casino, game, round
    FROM t
    WHERE (casino, game, round) IN
    (
        SELECT casino, game, round
        FROM temp
    )
)

21.3.1.5944  Elapsed: 4.464 sec. Processed 5.00 thousand rows, 225.89 KB (1.12 thousand rows/s., 50.60 KB/s.)

20.8.11.17    Elapsed: 0.611 sec. Processed 5.00 thousand rows, 225.89 KB (8.18 thousand rows/s., 369.73 KB/s.)

18.14.19.    Elapsed: 0.341 sec. Processed 5.00 thousand rows, 225.89 KB (14.66 thousand rows/s., 662.46 KB/s.)

```
const auto & elem = ptr->as<const ASTWindowListElement &>();
            WindowDescription desc;
            desc.window_name = elem.name;
            makeWindowDescriptionFromAST(desc, elem.definition.get());
            auto [it, inserted] = window_descriptions.insert(
                {desc.window_name, desc});
            if (!inserted)
            {
                throw Exception(ErrorCodes::BAD_ARGUMENTS,
                    "Window '{}' is defined twice in the WINDOW clause",
                    desc.window_name);
            }
        }
    }
    
    for (const ASTFunction * function_node : syntax->window_function_asts)
    {
        assert(function_node->is_window_function);
        WindowFunctionDescription window_function;
        window_function.function_node = function_node;
        window_function.column_name
            = window_function.function_node->getColumnName();
        window_function.function_parameters
            = window_function.function_node->parameters
                ? getAggregateFunctionParametersArray(
                    window_function.function_node->parameters)
                : Array();