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#include <Processors/Sources/DelayedSource.h>
#include <Processors/Sources/NullSource.h>
#include <Processors/Sinks/NullSink.h>
#include <Processors/ResizeProcessor.h>
#include <QueryPipeline/QueryPipelineBuilder.h>
namespace DB
{
DelayedSource::DelayedSource(const Block & header, Creator processors_creator, bool add_totals_port, bool add_extremes_port)
: IProcessor({}, OutputPorts(1 + (add_totals_port ? 1 : 0) + (add_extremes_port ? 1 : 0), header))
, creator(std::move(processors_creator))
{
auto output = outputs.begin();
main = &*output;
++output;
if (add_totals_port)
{
totals = &*output;
++output;
}
if (add_extremes_port)
{
extremes = &*output;
++output;
}
}
IProcessor::Status DelayedSource::prepare()
{
/// At first, wait for main output is needed and expand pipeline.
if (inputs.empty())
{
auto & first_output = outputs.front();
/// If main output port was finished before callback was called, stop execution.
if (first_output.isFinished())
{
for (auto & output : outputs)
output.finish();
return Status::Finished;
}
if (!first_output.isNeeded())
return Status::PortFull;
/// Call creator callback to get processors.
if (processors.empty())
return Status::Ready;
return Status::ExpandPipeline;
}
/// Process ports in order: main, totals, extremes
auto output = outputs.begin();
for (auto input = inputs.begin(); input != inputs.end(); ++input, ++output)
{
if (output->isFinished())
{
input->close();
continue;
}
if (!output->canPush())
return Status::PortFull;
if (input->isFinished())
{
output->finish();
continue;
}
input->setNeeded();
if (!input->hasData())
return Status::NeedData;
output->pushData(input->pullData(true));
return Status::PortFull;
}
return Status::Finished;
}
/// Fix port from returned pipe. Create source_port if created or drop if source_port is null.
void synchronizePorts(OutputPort *& pipe_port, OutputPort * source_port, const Block & header, Processors & processors)
{
if (source_port)
{
/// Need port in DelayedSource. Create NullSource.
if (!pipe_port)
{
processors.emplace_back(std::make_shared<NullSource>(header));
pipe_port = &processors.back()->getOutputs().back();
}
}
else
{
/// Has port in pipe, but don't need it. Create NullSink.
if (pipe_port)
{
auto sink = std::make_shared<NullSink>(header);
connect(*pipe_port, sink->getPort());
processors.emplace_back(std::move(sink));
pipe_port = nullptr;
}
}
}
void DelayedSource::work()
{
auto builder = creator();
auto pipe = QueryPipelineBuilder::getPipe(std::move(builder), resources);
const auto & header = main->getHeader();
if (pipe.empty())
{
auto source = std::make_shared<NullSource>(header);
main_output = &source->getPort();
processors.emplace_back(std::move(source));
return;
}
pipe.resize(1);
main_output = pipe.getOutputPort(0);
totals_output = pipe.getTotalsPort();
extremes_output = pipe.getExtremesPort();
processors = Pipe::detachProcessors(std::move(pipe));
if (rows_before_limit)
{
for (auto & processor : processors)
processor->setRowsBeforeLimitCounter(rows_before_limit);
}
synchronizePorts(totals_output, totals, header, processors);
synchronizePorts(extremes_output, extremes, header, processors);
}
Processors DelayedSource::expandPipeline()
{
/// Add new inputs. They must have the same header as output.
for (const auto & output : {main_output, totals_output, extremes_output})
{
if (!output)
continue;
inputs.emplace_back(outputs.front().getHeader(), this);
/// Connect checks that header is same for ports.
connect(*output, inputs.back());
if (output == main_output)
inputs.back().setNeeded();
}
/// Executor will check that all processors are connected.
return std::move(processors);
}
Pipe createDelayedPipe(const Block & header, DelayedSource::Creator processors_creator, bool add_totals_port, bool add_extremes_port)
{
auto source = std::make_shared<DelayedSource>(header, std::move(processors_creator), add_totals_port, add_extremes_port);
auto * main = &source->getPort();
auto * totals = source->getTotalsPort();
auto * extremes = source->getExtremesPort();
return Pipe(std::move(source), main, totals, extremes);
}
}
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