```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 * table = subquery_or_table_name->as<ASTIdentifier>();
    if (!table)
        return nullptr;
    auto table_id = context.resolveStorageID(subquery_or_table_name);
    const auto storage = DatabaseCatalog::instance().getTable(table_id, context);
    if (storage->getName() != "Set")
        return nullptr;
    const auto storage_set = std::dynamic_pointer_cast<StorageSet>(storage);
    return storage_set->getSet();
}
void SelectQueryExpressionAnalyzer::makeSetsForIndex(const ASTPtr & node)
{
    if (!node || !storage() || !storage()->supportsIndexForIn())
        return;
    for (auto & child : node->children)
    {
        
        if (child->as<ASTSubquery>())
            continue;