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45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#pragma once
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#include <Yandex/logger_useful.h>
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#include <DB/Core/SortDescription.h>
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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namespace DB
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{
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/** Соединяет поток сортированных по отдельности блоков в сортированный целиком поток.
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*/
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class MergeSortingBlockInputStream : public IProfilingBlockInputStream
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{
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public:
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MergeSortingBlockInputStream(BlockInputStreamPtr input_, SortDescription & description_)
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: input(input_), description(description_), has_been_read(false), log(&Logger::get("MergeSortingBlockInputStream"))
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{
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children.push_back(input);
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}
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Block readImpl();
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String getName() const { return "MergeSortingBlockInputStream"; }
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BlockInputStreamPtr clone() { return new MergeSortingBlockInputStream(input, description); }
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private:
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BlockInputStreamPtr input;
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SortDescription description;
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/// Всё было прочитано.
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bool has_been_read;
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Logger * log;
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/** Слить сразу много блоков с помощью priority queue.
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*/
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Block merge(Blocks & blocks);
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};
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}
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