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43 lines
923 B
C++
43 lines
923 B
C++
#pragma once
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#include <DataStreams/IBlockInputStream.h>
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#include <Interpreters/Aggregator.h>
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#include <Core/ColumnNumbers.h>
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namespace DB
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{
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class ExpressionActions;
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/** Takes blocks after grouping, with non-finalized aggregate functions.
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* Calculates all subsets of columns and aggreagetes over them.
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*/
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class CubeBlockInputStream : public IBlockInputStream
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{
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private:
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using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
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using AggregateColumns = std::vector<ColumnRawPtrs>;
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public:
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CubeBlockInputStream(
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const BlockInputStreamPtr & input_, const Aggregator::Params & params_);
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String getName() const override { return "Cube"; }
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Block getHeader() const override;
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protected:
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Block readImpl() override;
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private:
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Aggregator aggregator;
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ColumnNumbers keys;
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UInt32 mask = 0;
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Block source_block;
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Block zero_block;
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bool is_data_read = false;
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};
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}
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