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123 lines
4.5 KiB
C++
123 lines
4.5 KiB
C++
#include <AggregateFunctions/AggregateFunctionFactory.h>
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#include <AggregateFunctions/AggregateFunctionTopK.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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#define TOP_K_MAX_SIZE 0xFFFFFF
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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 ARGUMENT_OUT_OF_BOUND;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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namespace
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{
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/// Substitute return type for Date and DateTime
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template <bool is_weighted>
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class AggregateFunctionTopKDate : public AggregateFunctionTopK<DataTypeDate::FieldType, is_weighted>
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{
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using AggregateFunctionTopK<DataTypeDate::FieldType, is_weighted>::AggregateFunctionTopK;
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DataTypePtr getReturnType() const override { return std::make_shared<DataTypeArray>(std::make_shared<DataTypeDate>()); }
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};
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template <bool is_weighted>
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class AggregateFunctionTopKDateTime : public AggregateFunctionTopK<DataTypeDateTime::FieldType, is_weighted>
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{
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using AggregateFunctionTopK<DataTypeDateTime::FieldType, is_weighted>::AggregateFunctionTopK;
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DataTypePtr getReturnType() const override { return std::make_shared<DataTypeArray>(std::make_shared<DataTypeDateTime>()); }
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};
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template <bool is_weighted>
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static IAggregateFunction * createWithExtraTypes(const DataTypePtr & argument_type, UInt64 threshold, UInt64 load_factor, const Array & params)
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{
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WhichDataType which(argument_type);
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if (which.idx == TypeIndex::Date)
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return new AggregateFunctionTopKDate<is_weighted>(threshold, load_factor, {argument_type}, params);
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if (which.idx == TypeIndex::DateTime)
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return new AggregateFunctionTopKDateTime<is_weighted>(threshold, load_factor, {argument_type}, params);
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/// Check that we can use plain version of AggregateFunctionTopKGeneric
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if (argument_type->isValueUnambiguouslyRepresentedInContiguousMemoryRegion())
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return new AggregateFunctionTopKGeneric<true, is_weighted>(threshold, load_factor, argument_type, params);
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else
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return new AggregateFunctionTopKGeneric<false, is_weighted>(threshold, load_factor, argument_type, params);
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}
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template <bool is_weighted>
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AggregateFunctionPtr createAggregateFunctionTopK(const std::string & name, const DataTypes & argument_types, const Array & params)
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{
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if (!is_weighted)
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{
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assertUnary(name, argument_types);
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}
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else
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{
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assertBinary(name, argument_types);
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if (!isInteger(argument_types[1]))
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throw Exception("The second argument for aggregate function 'topKWeighted' must have integer type", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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UInt64 threshold = 10; /// default values
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UInt64 load_factor = 3;
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if (!params.empty())
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{
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if (params.size() > 2)
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throw Exception("Aggregate function " + name + " requires two parameters or less.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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UInt64 k = applyVisitor(FieldVisitorConvertToNumber<UInt64>(), params[0]);
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if (params.size() == 2)
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{
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load_factor = applyVisitor(FieldVisitorConvertToNumber<UInt64>(), params[1]);
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if (load_factor < 1)
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throw Exception("Too small parameter for aggregate function " + name + ". Minimum: 1",
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ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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}
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if (k > TOP_K_MAX_SIZE)
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throw Exception("Too large parameter for aggregate function " + name + ". Maximum: " + toString(TOP_K_MAX_SIZE),
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ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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if (k == 0)
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throw Exception("Parameter 0 is illegal for aggregate function " + name,
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ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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threshold = k;
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}
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AggregateFunctionPtr res(createWithNumericType<AggregateFunctionTopK, is_weighted>(*argument_types[0], threshold, load_factor, argument_types, params));
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if (!res)
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res = AggregateFunctionPtr(createWithExtraTypes<is_weighted>(argument_types[0], threshold, load_factor, params));
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if (!res)
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throw Exception("Illegal type " + argument_types[0]->getName() +
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" of argument for aggregate function " + name, ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return res;
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}
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}
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void registerAggregateFunctionTopK(AggregateFunctionFactory & factory)
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{
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factory.registerFunction("topK", createAggregateFunctionTopK<false>);
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factory.registerFunction("topKWeighted", createAggregateFunctionTopK<true>);
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}
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}
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