mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-22 17:50:47 +00:00
33 lines
575 B
C++
33 lines
575 B
C++
#ifndef DBMS_DATA_STREAMS_LIMITBLOCKINPUTSTREAM_H
|
|
#define DBMS_DATA_STREAMS_LIMITBLOCKINPUTSTREAM_H
|
|
|
|
#include <Poco/SharedPtr.h>
|
|
|
|
#include <DB/DataStreams/IBlockInputStream.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
using Poco::SharedPtr;
|
|
|
|
|
|
/** Реализует реляционную операцию LIMIT.
|
|
*/
|
|
class LimitBlockInputStream : public IBlockInputStream
|
|
{
|
|
public:
|
|
LimitBlockInputStream(SharedPtr<IBlockInputStream> input_, size_t limit_, size_t offset_ = 0);
|
|
Block read();
|
|
|
|
private:
|
|
SharedPtr<IBlockInputStream> input;
|
|
size_t limit;
|
|
size_t offset;
|
|
size_t pos;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|