ClickHouse/dbms/include/DB/DataStreams/MergingAggregatedBlockInputStream.h

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#pragma once
#include <DB/Interpreters/Aggregator.h>
#include <DB/DataStreams/IProfilingBlockInputStream.h>
namespace DB
{
using Poco::SharedPtr;
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/** Доагрегирует поток блоков, в котором каждый блок уже агрегирован.
* Агрегатные функции в блоках не должны быть финализированы, чтобы их состояния можно было объединить.
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*/
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class MergingAggregatedBlockInputStream : public IProfilingBlockInputStream
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{
public:
MergingAggregatedBlockInputStream(BlockInputStreamPtr input_, const Names & keys_names_,
const AggregateDescriptions & aggregates_, bool overflow_row_, bool final_, size_t max_threads_)
: aggregator(keys_names_, aggregates_, overflow_row_, 0, OverflowMode::THROW, nullptr, 0, 0),
final(final_), max_threads(max_threads_)
{
children.push_back(input_);
}
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String getName() const override { return "MergingAggregated"; }
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String getID() const override
{
std::stringstream res;
res << "MergingAggregated(" << children.back()->getID() << ", " << aggregator.getID() << ")";
return res.str();
}
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protected:
Block readImpl() override;
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private:
Aggregator aggregator;
bool final;
size_t max_threads;
bool executed = false;
BlocksList blocks;
BlocksList::iterator it;
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};
}