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68 lines
2.1 KiB
C++
68 lines
2.1 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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#include <DB/Interpreters/ExpressionActions.h>
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namespace DB
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{
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using Poco::SharedPtr;
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/** Принимает блоки после группировки, с нефиализированными агрегатными функциями.
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* Вычисляет тотальные значения в соответствии с totals_mode.
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* Если нужно, вычисляет выражение из HAVING и фильтрует им строки. Отдает финализированные и отфильтрованные блоки.
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*/
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class TotalsHavingBlockInputStream : public IProfilingBlockInputStream
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{
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public:
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TotalsHavingBlockInputStream(BlockInputStreamPtr input_, const Names & keys_names_,
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const AggregateDescriptions & aggregates_, bool overflow_row_, ExpressionActionsPtr expression_,
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const std::string & filter_column_, TotalsMode totals_mode_, float auto_include_threshold_)
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: aggregator(new Aggregator(keys_names_, aggregates_, overflow_row_)), overflow_row(overflow_row_),
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expression(expression_), filter_column_name(filter_column_), totals_mode(totals_mode_),
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auto_include_threshold(auto_include_threshold_), passed_keys(0), total_keys(0)
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{
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children.push_back(input_);
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}
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String getName() const { return "TotalsHavingBlockInputStream"; }
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String getID() const
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{
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std::stringstream res;
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res << "TotalsHavingBlockInputStream(" << children.back()->getID() << ", " << aggregator->getID()
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<< "," << filter_column_name << ")";
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return res.str();
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}
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const Block & getTotals();
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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 overflow_row;
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ExpressionActionsPtr expression;
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String filter_column_name;
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TotalsMode totals_mode;
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float auto_include_threshold;
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size_t passed_keys;
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size_t total_keys;
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Block current_totals;
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Block overflow_aggregates;
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void addToTotals(Block & totals, Block & block, const IColumn::Filter * filter, size_t rows);
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void addToTotals(Block & totals, Block & block, const IColumn::Filter * filter)
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{
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addToTotals(totals, block, filter, block.rows());
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}
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};
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}
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