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41 lines
891 B
C++
41 lines
891 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 subtotals and grand totals values for a set of columns.
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*/
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class RollupBlockInputStream : 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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RollupBlockInputStream(
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const BlockInputStreamPtr & input_, const Aggregator::Params & params_);
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String getName() const override { return "Rollup"; }
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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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ssize_t current_key = -1;
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Block rollup_block;
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};
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}
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