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52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
#pragma once
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#include <DB/Interpreters/Aggregator.h>
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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namespace DB
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{
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using Poco::SharedPtr;
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/** Доагрегирует поток блоков, в котором каждый блок уже агрегирован.
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* 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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{
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public:
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MergingAggregatedBlockInputStream(BlockInputStreamPtr input_, const ColumnNumbers & keys_,
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const AggregateDescriptions & aggregates_, bool overflow_row_, bool final_)
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: aggregator(new Aggregator(keys_, aggregates_, overflow_row_)), final(final_), has_been_read(false)
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{
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children.push_back(input_);
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}
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MergingAggregatedBlockInputStream(BlockInputStreamPtr input_, const Names & keys_names_,
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const AggregateDescriptions & aggregates_, bool overflow_row_, bool final_)
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: aggregator(new Aggregator(keys_names_, aggregates_, overflow_row_)), final(final_), has_been_read(false)
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{
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children.push_back(input_);
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}
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String getName() const { return "MergingAggregatedBlockInputStream"; }
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String getID() const
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{
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std::stringstream res;
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res << "MergingAggregated(" << children.back()->getID() << ", " << aggregator->getID() << ")";
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return res.str();
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}
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protected:
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Block readImpl();
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private:
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SharedPtr<Aggregator> aggregator;
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bool final;
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bool has_been_read;
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};
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}
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