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#pragma once
#include <Processors/Merges/Algorithms/IMergingAlgorithm.h>
#include <Processors/IProcessor.h>
#include <Common/Stopwatch.h>
namespace DB
{
/// Base class for IMergingTransform.
/// It is needed to extract all non-template methods in single translation unit.
class IMergingTransformBase : public IProcessor
{
public:
IMergingTransformBase(
size_t num_inputs,
const Block & input_header,
const Block & output_header,
bool have_all_inputs_,
UInt64 limit_hint_,
bool always_read_till_end_);
IMergingTransformBase(
const Blocks & input_headers,
const Block & output_header,
bool have_all_inputs_,
UInt64 limit_hint_,
bool always_read_till_end_);
OutputPort & getOutputPort() { return outputs.front(); }
/// Methods to add additional input port. It is possible to do only before the first call of `prepare`.
void addInput();
/// Need to be called after all inputs are added. (only if have_all_inputs was not specified).
void setHaveAllInputs();
Status prepare() override;
protected:
virtual void onNewInput(); /// Is called when new input is added. Only if have_all_inputs = false.
virtual void onFinish() {} /// Is called when all data is processed.
/// Processor state.
struct State
{
Chunk output_chunk;
IMergingAlgorithm::Input input_chunk;
bool has_input = false;
bool is_finished = false;
bool need_data = false;
bool no_data = false;
size_t next_input_to_read = 0;
IMergingAlgorithm::Inputs init_chunks;
};
State state;
private:
struct InputState
{
explicit InputState(InputPort & port_) : port(port_) {}
InputPort & port;
bool is_initialized = false;
};
std::vector<InputState> input_states;
std::atomic<bool> have_all_inputs;
bool is_initialized = false;
UInt64 limit_hint = 0;
bool always_read_till_end = false;
IProcessor::Status prepareInitializeInputs();
};
/// Implementation of MergingTransform using IMergingAlgorithm.
template <typename Algorithm>
class IMergingTransform : public IMergingTransformBase
{
public:
template <typename ... Args>
IMergingTransform(
size_t num_inputs,
const Block & input_header,
const Block & output_header,
bool have_all_inputs_,
UInt64 limit_hint_,
bool always_read_till_end_,
Args && ... args)
: IMergingTransformBase(num_inputs, input_header, output_header, have_all_inputs_, limit_hint_, always_read_till_end_)
, algorithm(std::forward<Args>(args) ...)
{
}
template <typename ... Args>
IMergingTransform(
const Blocks & input_headers,
const Block & output_header,
bool have_all_inputs_,
UInt64 limit_hint_,
bool always_read_till_end_,
bool empty_chunk_on_finish_,
Args && ... args)
: IMergingTransformBase(input_headers, output_header, have_all_inputs_, limit_hint_, always_read_till_end_)
, empty_chunk_on_finish(empty_chunk_on_finish_)
, algorithm(std::forward<Args>(args) ...)
{
}
void work() override
{
if (!state.init_chunks.empty())
algorithm.initialize(std::move(state.init_chunks));
if (state.has_input)
{
// std::cerr << "Consume chunk with " << state.input_chunk.getNumRows()
// << " for input " << state.next_input_to_read << std::endl;
algorithm.consume(state.input_chunk, state.next_input_to_read);
state.has_input = false;
}
else if (state.no_data && empty_chunk_on_finish)
{
IMergingAlgorithm::Input current_input;
algorithm.consume(current_input, state.next_input_to_read);
state.no_data = false;
}
IMergingAlgorithm::Status status = algorithm.merge();
if ((status.chunk && status.chunk.hasRows()) || status.chunk.hasChunkInfo())
{
// std::cerr << "Got chunk with " << status.chunk.getNumRows() << " rows" << std::endl;
state.output_chunk = std::move(status.chunk);
}
if (status.required_source >= 0)
{
// std::cerr << "Required data for input " << status.required_source << std::endl;
state.next_input_to_read = status.required_source;
state.need_data = true;
}
if (status.is_finished)
{
// std::cerr << "Finished" << std::endl;
state.is_finished = true;
}
}
protected:
/// Call `consume` with empty chunk when there is no more data.
bool empty_chunk_on_finish = false;
Algorithm algorithm;
/// Profile info.
Stopwatch total_stopwatch {CLOCK_MONOTONIC_COARSE};
private:
using IMergingTransformBase::state;
};
using MergingTransformPtr = std::shared_ptr<IMergingTransformBase>;
}
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