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120 lines
3.1 KiB
C++
120 lines
3.1 KiB
C++
#include <memory>
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#include <random>
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#include <DataTypes/DataTypesNumber.h>
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#include <Common/thread_local_rng.h>
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#include <IO/ReadBuffer.h>
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#include <IO/WriteBuffer.h>
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#include <AggregateFunctions/IAggregateFunction.h>
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#include <AggregateFunctions/AggregateFunctionFactory.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 AGGREGATE_FUNCTION_THROW;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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namespace
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{
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struct AggregateFunctionThrowData
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{
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bool allocated;
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AggregateFunctionThrowData() : allocated(true) {}
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~AggregateFunctionThrowData()
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{
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volatile bool * allocated_ptr = &allocated;
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if (*allocated_ptr)
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*allocated_ptr = false;
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else
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abort();
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}
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};
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/** Throw on creation with probability specified in parameter.
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* It will check correct destruction of the state.
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* This is intended to check for exception safety.
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*/
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class AggregateFunctionThrow final : public IAggregateFunctionDataHelper<AggregateFunctionThrowData, AggregateFunctionThrow>
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{
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private:
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Float64 throw_probability;
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public:
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AggregateFunctionThrow(const DataTypes & argument_types_, const Array & parameters_, Float64 throw_probability_)
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: IAggregateFunctionDataHelper(argument_types_, parameters_), throw_probability(throw_probability_) {}
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String getName() const override
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{
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return "aggThrow";
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}
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DataTypePtr getReturnType() const override
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{
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return std::make_shared<DataTypeUInt8>();
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}
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void create(AggregateDataPtr place) const override
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{
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if (std::uniform_real_distribution<>(0.0, 1.0)(thread_local_rng) <= throw_probability)
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throw Exception("Aggregate function " + getName() + " has thrown exception successfully", ErrorCodes::AGGREGATE_FUNCTION_THROW);
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new (place) Data;
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}
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void destroy(AggregateDataPtr place) const noexcept override
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{
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data(place).~Data();
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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 & buf) const override
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{
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char c = 0;
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buf.write(c);
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}
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void deserialize(AggregateDataPtr, ReadBuffer & buf, Arena *) const override
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{
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char c = 0;
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buf.read(c);
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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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};
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}
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void registerAggregateFunctionAggThrow(AggregateFunctionFactory & factory)
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{
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factory.registerFunction("aggThrow", [](const std::string & name, const DataTypes & argument_types, const Array & parameters)
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{
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Float64 throw_probability = 1.0;
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if (parameters.size() == 1)
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throw_probability = parameters[0].safeGet<Float64>();
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else if (parameters.size() > 1)
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throw Exception("Aggregate function " + name + " cannot have more than one parameter", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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return std::make_shared<AggregateFunctionThrow>(argument_types, parameters, throw_probability);
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});
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}
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}
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