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75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
#pragma once
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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#include <DB/Interpreters/ExpressionAnalyzer.h>
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namespace DB
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{
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/** Отдаёт без изменений данные из потока блоков, но перед чтением первого блока инициализирует все переданные множества.
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*/
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class CreatingSetsBlockInputStream : public IProfilingBlockInputStream
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{
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public:
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CreatingSetsBlockInputStream(
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BlockInputStreamPtr input,
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const SubqueriesForSets & subqueries_for_sets_,
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const Limits & limits)
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: subqueries_for_sets(subqueries_for_sets_),
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max_rows_to_transfer(limits.max_rows_to_transfer),
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max_bytes_to_transfer(limits.max_bytes_to_transfer),
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transfer_overflow_mode(limits.transfer_overflow_mode)
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{
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for (auto & elem : subqueries_for_sets)
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if (elem.second.source)
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children.push_back(elem.second.source);
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children.push_back(input);
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}
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String getName() const override { return "CreatingSets"; }
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String getID() const override
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{
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std::stringstream res;
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res << "CreatingSets(";
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Strings children_ids(children.size());
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for (size_t i = 0; i < children.size(); ++i)
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children_ids[i] = children[i]->getID();
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/// Будем считать, что порядок создания множеств не имеет значения.
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std::sort(children_ids.begin(), children_ids.end() - 1);
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for (size_t i = 0; i < children_ids.size(); ++i)
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res << (i == 0 ? "" : ", ") << children_ids[i];
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res << ")";
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return res.str();
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}
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/// Берёт totals только из основного источника, а не из источников подзапросов.
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const Block & getTotals() override;
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protected:
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Block readImpl() override;
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private:
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SubqueriesForSets subqueries_for_sets;
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bool created = false;
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size_t max_rows_to_transfer;
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size_t max_bytes_to_transfer;
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OverflowMode transfer_overflow_mode;
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size_t rows_to_transfer = 0;
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size_t bytes_to_transfer = 0;
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Logger * log = &Logger::get("CreatingSetsBlockInputStream");
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void create(SubqueryForSet & subquery);
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};
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}
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