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39 lines
715 B
C
39 lines
715 B
C
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#pragma once
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#include <DB/Core/ColumnNumbers.h>
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#include <DB/DataStreams/IBlockInputStream.h>
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#include <DB/AggregateFunctions/IAggregateFunction.h>
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namespace DB
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{
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struct AggregateDescription
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{
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AggregateFunctionPtr function;
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ColumnNumbers arguments;
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};
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typedef std::vector<AggregateDescription> AggregateDescriptions;
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typedef std::map<Row, AggregateFunctions> AggregatedData;
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/** Агрегирует поток блоков.
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*/
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class Aggregate
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{
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public:
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Aggregate(const ColumnNumbers & keys_, AggregateDescriptions & aggregates_) : keys(keys_), aggregates(aggregates_) {};
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AggregatedData execute(BlockInputStreamPtr stream);
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private:
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ColumnNumbers keys;
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AggregateDescriptions aggregates;
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};
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}
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