mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-23 16:12:01 +00:00
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
#pragma once
|
|
|
|
#include <DB/Interpreters/Aggregator.h>
|
|
#include <DB/DataStreams/IProfilingBlockInputStream.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
using Poco::SharedPtr;
|
|
|
|
|
|
/** Доагрегирует поток блоков, в котором каждый блок уже агрегирован.
|
|
* Агрегатные функции в блоках не должны быть финализированы, чтобы их состояния можно было объединить.
|
|
*/
|
|
class MergingAggregatedBlockInputStream : public IProfilingBlockInputStream
|
|
{
|
|
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_);
|
|
}
|
|
|
|
String getName() const override { return "MergingAggregatedBlockInputStream"; }
|
|
|
|
String getID() const override
|
|
{
|
|
std::stringstream res;
|
|
res << "MergingAggregated(" << children.back()->getID() << ", " << aggregator.getID() << ")";
|
|
return res.str();
|
|
}
|
|
|
|
protected:
|
|
Block readImpl() override;
|
|
|
|
private:
|
|
Aggregator aggregator;
|
|
bool final;
|
|
size_t max_threads;
|
|
|
|
bool executed = false;
|
|
BlocksList blocks;
|
|
BlocksList::iterator it;
|
|
};
|
|
|
|
}
|