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115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
#pragma once
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#include <DataTypes/DataTypesNumber.h>
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#include <Columns/ColumnsNumber.h>
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#include <Common/assert_cast.h>
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#include <AggregateFunctions/IAggregateFunction.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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/** Not an aggregate function, but an adapter of aggregate functions,
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* which any aggregate function `agg(x)` makes an aggregate function of the form `aggIf(x, cond)`.
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* The adapted aggregate function takes two arguments - a value and a condition,
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* and calculates the nested aggregate function for the values when the condition is satisfied.
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* For example, avgIf(x, cond) calculates the average x if `cond`.
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*/
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class AggregateFunctionIf final : public IAggregateFunctionHelper<AggregateFunctionIf>
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{
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private:
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AggregateFunctionPtr nested_func;
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size_t num_arguments;
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public:
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AggregateFunctionIf(AggregateFunctionPtr nested, const DataTypes & types)
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: IAggregateFunctionHelper<AggregateFunctionIf>(types, nested->getParameters())
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, nested_func(nested), num_arguments(types.size())
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{
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if (num_arguments == 0)
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throw Exception("Aggregate function " + getName() + " require at least one argument", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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if (!isUInt8(types.back()))
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throw Exception("Last argument for aggregate function " + getName() + " must be UInt8", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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String getName() const override
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{
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return nested_func->getName() + "If";
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}
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DataTypePtr getReturnType() const override
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{
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return nested_func->getReturnType();
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}
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void create(AggregateDataPtr place) const override
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{
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nested_func->create(place);
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}
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void destroy(AggregateDataPtr place) const noexcept override
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{
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nested_func->destroy(place);
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}
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bool hasTrivialDestructor() const override
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{
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return nested_func->hasTrivialDestructor();
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}
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size_t sizeOfData() const override
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{
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return nested_func->sizeOfData();
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}
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size_t alignOfData() const override
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{
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return nested_func->alignOfData();
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}
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void add(AggregateDataPtr place, const IColumn ** columns, size_t row_num, Arena * arena) const override
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{
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if (assert_cast<const ColumnUInt8 &>(*columns[num_arguments - 1]).getData()[row_num])
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nested_func->add(place, columns, row_num, arena);
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}
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void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs, Arena * arena) const override
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{
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nested_func->merge(place, rhs, arena);
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}
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void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const override
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{
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nested_func->serialize(place, buf);
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}
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void deserialize(AggregateDataPtr place, ReadBuffer & buf, Arena * arena) const override
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{
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nested_func->deserialize(place, buf, arena);
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}
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void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const override
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{
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nested_func->insertResultInto(place, to);
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}
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bool allocatesMemoryInArena() const override
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{
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return nested_func->allocatesMemoryInArena();
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}
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bool isState() const override
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{
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return nested_func->isState();
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}
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};
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}
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