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https://github.com/ClickHouse/ClickHouse.git
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89 lines
1.7 KiB
C++
89 lines
1.7 KiB
C++
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#pragma once
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#include <DataTypes/DataTypeNothing.h>
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#include <Columns/IColumn.h>
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#include <AggregateFunctions/IAggregateFunction.h>
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namespace DB
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{
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/** Aggregate function that takes arbitary number of arbitary arguments and does nothing.
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*/
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class AggregateFunctionNothing final : public IAggregateFunction
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{
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public:
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String getName() const override
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{
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return "nothing";
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}
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DataTypePtr getReturnType() const override
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{
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return std::make_shared<DataTypeNothing>();
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}
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void setArguments(const DataTypes &) override
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{
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}
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void setParameters(const Array &) override
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{
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}
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void create(AggregateDataPtr) const override
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{
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}
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void destroy(AggregateDataPtr) const noexcept override
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{
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}
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bool hasTrivialDestructor() const override
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{
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return true;
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}
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size_t sizeOfData() const override
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{
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return 0;
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}
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size_t alignOfData() const override
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{
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return 1;
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}
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void add(AggregateDataPtr, const IColumn **, size_t, Arena *) const override
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{
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}
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void merge(AggregateDataPtr, ConstAggregateDataPtr, Arena *) const override
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{
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}
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void serialize(ConstAggregateDataPtr, WriteBuffer &) const override
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{
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}
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void deserialize(AggregateDataPtr, ReadBuffer &, Arena *) const override
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{
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}
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void insertResultInto(ConstAggregateDataPtr, IColumn & to) const override
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{
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to.insertDefault();
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}
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static void addFree(const IAggregateFunction *, AggregateDataPtr, const IColumn **, size_t, Arena *)
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{
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}
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IAggregateFunction::AddFunc getAddressOfAddFunction() const override final { return &addFree; }
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const char * getHeaderFilePath() const override { return __FILE__; }
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};
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}
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