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29 lines
731 B
C++
29 lines
731 B
C++
#pragma once
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#include <Processors/IInflatingTransform.h>
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#include <Processors/Transforms/AggregatingTransform.h>
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namespace DB
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{
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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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class RollupTransform : public IInflatingTransform
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{
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public:
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RollupTransform(Block header, AggregatingTransformParamsPtr params);
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String getName() const override { return "RollupTransform"; }
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protected:
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void consume(Chunk chunk) override;
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bool canGenerate() override;
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Chunk generate() override;
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private:
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AggregatingTransformParamsPtr params;
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ColumnNumbers keys;
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Chunk consumed_chunk;
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size_t last_removed_key = 0;
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};
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}
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