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103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
#include <AggregateFunctions/AggregateFunctionFactory.h>
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#include <AggregateFunctions/AggregateFunctionGroupArrayMoving.h>
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#include <AggregateFunctions/Helpers.h>
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#include <AggregateFunctions/FactoryHelpers.h>
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#include <DataTypes/DataTypeDate.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include "registerAggregateFunctions.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 ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int BAD_ARGUMENTS;
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}
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namespace
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{
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template <typename T, typename LimitNumberOfElements>
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struct MovingSum
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{
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using DataType = MovingSumData<T>;
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using Function = MovingImpl<T, LimitNumberOfElements, DataType>;
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};
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template <typename T, typename LimitNumberOfElements>
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struct MovingAvg
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{
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using DataType = MovingAvgData<T>;
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using Function = MovingImpl<T, LimitNumberOfElements, DataType>;
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};
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template <typename T, typename LimitNumberOfElements> using MovingSumTemplate = typename MovingSum<T, LimitNumberOfElements>::Function;
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template <typename T, typename LimitNumberOfElements> using MovingAvgTemplate = typename MovingAvg<T, LimitNumberOfElements>::Function;
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template <template <typename, typename> class Function, typename HasLimit, typename ... TArgs>
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inline AggregateFunctionPtr createAggregateFunctionMovingImpl(const std::string & name, const DataTypePtr & argument_type, TArgs ... args)
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{
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AggregateFunctionPtr res;
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if (isDecimal(argument_type))
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res.reset(createWithDecimalType<Function, HasLimit>(*argument_type, argument_type, std::forward<TArgs>(args)...));
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else
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res.reset(createWithNumericType<Function, HasLimit>(*argument_type, argument_type, std::forward<TArgs>(args)...));
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if (!res)
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throw Exception("Illegal type " + argument_type->getName() + " of argument for aggregate function " + name,
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return res;
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}
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template <template <typename, typename> class Function>
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AggregateFunctionPtr createAggregateFunctionMoving(const std::string & name, const DataTypes & argument_types, const Array & parameters)
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{
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assertUnary(name, argument_types);
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bool limit_size = false;
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UInt64 max_elems = std::numeric_limits<UInt64>::max();
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if (parameters.empty())
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{
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// cumulative sum without parameter
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}
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else if (parameters.size() == 1)
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{
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auto type = parameters[0].getType();
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if (type != Field::Types::Int64 && type != Field::Types::UInt64)
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throw Exception("Parameter for aggregate function " + name + " should be positive number", ErrorCodes::BAD_ARGUMENTS);
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if ((type == Field::Types::Int64 && parameters[0].get<Int64>() < 0) ||
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(type == Field::Types::UInt64 && parameters[0].get<UInt64>() == 0))
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throw Exception("Parameter for aggregate function " + name + " should be positive number", ErrorCodes::BAD_ARGUMENTS);
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limit_size = true;
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max_elems = parameters[0].get<UInt64>();
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}
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else
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throw Exception("Incorrect number of parameters for aggregate function " + name + ", should be 0 or 1",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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if (!limit_size)
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return createAggregateFunctionMovingImpl<Function, std::false_type>(name, argument_types[0]);
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else
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return createAggregateFunctionMovingImpl<Function, std::true_type>(name, argument_types[0], max_elems);
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}
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}
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void registerAggregateFunctionMoving(AggregateFunctionFactory & factory)
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{
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factory.registerFunction("groupArrayMovingSum", createAggregateFunctionMoving<MovingSumTemplate>);
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factory.registerFunction("groupArrayMovingAvg", createAggregateFunctionMoving<MovingAvgTemplate>);
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}
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}
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