ClickHouse/dbms/Processors/DelayedPortsProcessor.h
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

38 lines
1.1 KiB
C++

#pragma once
#include <Processors/IProcessor.h>
namespace DB
{
/// Processor with N inputs and N outputs. Only moves data from i-th input to i-th output as is.
/// Some ports are delayed. Delayed ports are processed after other outputs are all finished.
/// Data between ports is not mixed. It is important because this processor can be used before MergingSortedTransform.
/// Delayed ports are appeared after joins, when some non-matched data need to be processed at the end.
class DelayedPortsProcessor : public IProcessor
{
public:
DelayedPortsProcessor(const Block & header, size_t num_ports, const PortNumbers & delayed_ports);
String getName() const override { return "DelayedPorts"; }
Status prepare(const PortNumbers &, const PortNumbers &) override;
private:
struct PortsPair
{
InputPort * input_port = nullptr;
OutputPort * output_port = nullptr;
bool is_delayed = false;
bool is_finished = false;
};
std::vector<PortsPair> port_pairs;
size_t num_delayed;
size_t num_finished = 0;
bool processPair(PortsPair & pair);
};
}