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#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 final : public IProcessor
{
public:
DelayedPortsProcessor(const Block & header, size_t num_ports, const PortNumbers & delayed_ports, bool assert_main_ports_empty = false);
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;
const size_t num_delayed_ports;
size_t num_finished_inputs = 0;
size_t num_finished_outputs = 0;
size_t num_finished_main_inputs = 0;
std::vector<size_t> output_to_pair;
bool are_inputs_initialized = false;
bool processPair(PortsPair & pair);
void finishPair(PortsPair & pair);
bool shouldSkipDelayed() const;
};
}
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