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92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
#include <AggregateFunctions/AggregateFunctionFactory.h>
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#include <AggregateFunctions/Helpers.h>
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#include <AggregateFunctions/AggregateFunctionUniqUpTo.h>
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#include <DataTypes/DataTypeDate.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypeFixedString.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 NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int ARGUMENT_OUT_OF_BOUND;
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}
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namespace
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{
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constexpr UInt8 uniq_upto_max_threshold = 100;
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AggregateFunctionPtr createAggregateFunctionUniqUpTo(const std::string & name, const DataTypes & argument_types, const Array & params)
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{
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UInt8 threshold = 5; /// default value
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if (!params.empty())
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{
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if (params.size() != 1)
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throw Exception("Aggregate function " + name + " requires one parameter or less.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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UInt64 threshold_param = applyVisitor(FieldVisitorConvertToNumber<UInt64>(), params[0]);
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if (threshold_param > uniq_upto_max_threshold)
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throw Exception("Too large parameter for aggregate function " + name + ". Maximum: " + toString(uniq_upto_max_threshold),
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ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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threshold = threshold_param;
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}
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if (argument_types.empty())
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throw Exception("Incorrect number of arguments for aggregate function " + name,
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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bool use_exact_hash_function = !isAllArgumentsContiguousInMemory(argument_types);
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if (argument_types.size() == 1)
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{
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const IDataType & argument_type = *argument_types[0];
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AggregateFunctionPtr res(createWithNumericType<AggregateFunctionUniqUpTo>(*argument_types[0], threshold, argument_types, params));
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WhichDataType which(argument_type);
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if (res)
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return res;
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else if (which.isDate())
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return std::make_shared<AggregateFunctionUniqUpTo<DataTypeDate::FieldType>>(threshold, argument_types, params);
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else if (which.isDateTime())
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return std::make_shared<AggregateFunctionUniqUpTo<DataTypeDateTime::FieldType>>(threshold, argument_types, params);
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else if (which.isStringOrFixedString())
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return std::make_shared<AggregateFunctionUniqUpTo<String>>(threshold, argument_types, params);
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else if (which.isUUID())
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return std::make_shared<AggregateFunctionUniqUpTo<DataTypeUUID::FieldType>>(threshold, argument_types, params);
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else if (which.isTuple())
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{
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if (use_exact_hash_function)
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return std::make_shared<AggregateFunctionUniqUpToVariadic<true, true>>(argument_types, params, threshold);
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else
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return std::make_shared<AggregateFunctionUniqUpToVariadic<false, true>>(argument_types, params, threshold);
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}
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}
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/// "Variadic" method also works as a fallback generic case for single argument.
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if (use_exact_hash_function)
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return std::make_shared<AggregateFunctionUniqUpToVariadic<true, false>>(argument_types, params, threshold);
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else
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return std::make_shared<AggregateFunctionUniqUpToVariadic<false, false>>(argument_types, params, threshold);
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}
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}
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void registerAggregateFunctionUniqUpTo(AggregateFunctionFactory & factory)
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{
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factory.registerFunction("uniqUpTo", {createAggregateFunctionUniqUpTo, {true}});
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}
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}
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