```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.)

```
{
    if (hasPrewhere())
    {
        const ExpressionActionsChain::Step & step = *chain.steps.at(0);
        prewhere_info->remove_prewhere_column = step.can_remove_required_output.at(0);
        NameSet columns_to_remove;
        for (size_t i = 1; i < step.required_output.size(); ++i)
        {
            if (step.can_remove_required_output[i])
                columns_to_remove.insert(step.required_output[i]);
        }
        columns_to_remove_after_prewhere = std::move(columns_to_remove);
    }
    else if (hasFilter())
    {
        
        filter_info->do_remove_column = chain.steps.at(0)->can_remove_required_output.at(0);
    }
    if (hasWhere())
        remove_where_filter = chain.steps.at(where_step_num)->can_remove_required_output.at(0);
}
void ExpressionAnalysisResult::removeExtraColumns() const