```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.)

```
#pragma once
#include <Processors/Formats/IOutputFormat.h>
#include <Common/ConcurrentBoundedQueue.h>
#include <DataStreams/BlockStreamProfileInfo.h>
#include <IO/WriteBuffer.h>
namespace DB
{
class LazyOutputFormat : public IOutputFormat
{
public:
    explicit LazyOutputFormat(const Block & header)
        : IOutputFormat(header, out), queue(2), finished_processing(false) {}
    String getName() const override { return "LazyOutputFormat"; }
    Chunk getChunk(UInt64 milliseconds = 0);
    Chunk getTotals();
    Chunk getExtremes();
    bool isFinished() { return finished_processing && queue.size() == 0; }
    BlockStreamProfileInfo & getProfileInfo() { return info; }
    void setRowsBeforeLimit(size_t rows_before_limit) override;
    void finish()