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#include <AggregateFunctions/AggregateFunctionFactory.h>
#include <AggregateFunctions/AggregateFunctionTopK.h>
#include <AggregateFunctions/Helpers.h>
#include <AggregateFunctions/FactoryHelpers.h>
#include <Common/FieldVisitorConvertToNumber.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeIPv4andIPv6.h>
static inline constexpr UInt64 TOP_K_MAX_SIZE = 0xFFFFFF;
namespace DB
{
struct Settings;
namespace ErrorCodes
{
extern const int ARGUMENT_OUT_OF_BOUND;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int LOGICAL_ERROR;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
namespace
{
/// Substitute return type for Date and DateTime
template <bool is_weighted>
class AggregateFunctionTopKDate : public AggregateFunctionTopK<DataTypeDate::FieldType, is_weighted>
{
public:
using AggregateFunctionTopK<DataTypeDate::FieldType, is_weighted>::AggregateFunctionTopK;
AggregateFunctionTopKDate(UInt64 threshold_, UInt64 load_factor, const DataTypes & argument_types_, const Array & params)
: AggregateFunctionTopK<DataTypeDate::FieldType, is_weighted>(
threshold_,
load_factor,
argument_types_,
params,
std::make_shared<DataTypeArray>(std::make_shared<DataTypeDate>()))
{}
};
template <bool is_weighted>
class AggregateFunctionTopKDateTime : public AggregateFunctionTopK<DataTypeDateTime::FieldType, is_weighted>
{
public:
using AggregateFunctionTopK<DataTypeDateTime::FieldType, is_weighted>::AggregateFunctionTopK;
AggregateFunctionTopKDateTime(UInt64 threshold_, UInt64 load_factor, const DataTypes & argument_types_, const Array & params)
: AggregateFunctionTopK<DataTypeDateTime::FieldType, is_weighted>(
threshold_,
load_factor,
argument_types_,
params,
std::make_shared<DataTypeArray>(std::make_shared<DataTypeDateTime>()))
{}
};
template <bool is_weighted>
class AggregateFunctionTopKIPv4 : public AggregateFunctionTopK<DataTypeIPv4::FieldType, is_weighted>
{
public:
using AggregateFunctionTopK<DataTypeIPv4::FieldType, is_weighted>::AggregateFunctionTopK;
AggregateFunctionTopKIPv4(UInt64 threshold_, UInt64 load_factor, const DataTypes & argument_types_, const Array & params)
: AggregateFunctionTopK<DataTypeIPv4::FieldType, is_weighted>(
threshold_,
load_factor,
argument_types_,
params,
std::make_shared<DataTypeArray>(std::make_shared<DataTypeIPv4>()))
{}
};
template <bool is_weighted>
IAggregateFunction * createWithExtraTypes(const DataTypes & argument_types, UInt64 threshold, UInt64 load_factor, const Array & params)
{
if (argument_types.empty())
throw DB::Exception(ErrorCodes::LOGICAL_ERROR, "Got empty arguments list");
WhichDataType which(argument_types[0]);
if (which.idx == TypeIndex::Date)
return new AggregateFunctionTopKDate<is_weighted>(threshold, load_factor, argument_types, params);
if (which.idx == TypeIndex::DateTime)
return new AggregateFunctionTopKDateTime<is_weighted>(threshold, load_factor, argument_types, params);
if (which.idx == TypeIndex::IPv4)
return new AggregateFunctionTopKIPv4<is_weighted>(threshold, load_factor, argument_types, params);
/// Check that we can use plain version of AggregateFunctionTopKGeneric
if (argument_types[0]->isValueUnambiguouslyRepresentedInContiguousMemoryRegion())
return new AggregateFunctionTopKGeneric<true, is_weighted>(threshold, load_factor, argument_types, params);
else
return new AggregateFunctionTopKGeneric<false, is_weighted>(threshold, load_factor, argument_types, params);
}
template <bool is_weighted>
AggregateFunctionPtr createAggregateFunctionTopK(const std::string & name, const DataTypes & argument_types, const Array & params, const Settings *)
{
if (!is_weighted)
{
assertUnary(name, argument_types);
}
else
{
assertBinary(name, argument_types);
if (!isInteger(argument_types[1]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The second argument for aggregate function 'topKWeighted' must have integer type");
}
UInt64 threshold = 10; /// default values
UInt64 load_factor = 3;
if (!params.empty())
{
if (params.size() > 2)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Aggregate function '{}' requires two parameters or less", name);
if (params.size() == 2)
{
load_factor = applyVisitor(FieldVisitorConvertToNumber<UInt64>(), params[1]);
if (load_factor < 1)
throw Exception(ErrorCodes::ARGUMENT_OUT_OF_BOUND,
"Too small parameter 'load_factor' for aggregate function '{}' (got {}, minimum is 1)", name, load_factor);
}
threshold = applyVisitor(FieldVisitorConvertToNumber<UInt64>(), params[0]);
if (threshold > TOP_K_MAX_SIZE || load_factor > TOP_K_MAX_SIZE || threshold * load_factor > TOP_K_MAX_SIZE)
throw Exception(ErrorCodes::ARGUMENT_OUT_OF_BOUND,
"Too large parameter(s) for aggregate function '{}' (maximum is {})", name, toString(TOP_K_MAX_SIZE));
if (threshold == 0)
throw Exception(ErrorCodes::ARGUMENT_OUT_OF_BOUND, "Parameter 0 is illegal for aggregate function '{}'", name);
}
AggregateFunctionPtr res(createWithNumericType<AggregateFunctionTopK, is_weighted>(
*argument_types[0], threshold, load_factor, argument_types, params));
if (!res)
res = AggregateFunctionPtr(createWithExtraTypes<is_weighted>(argument_types, threshold, load_factor, params));
if (!res)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument for aggregate function '{}'", argument_types[0]->getName(), name);
return res;
}
}
void registerAggregateFunctionTopK(AggregateFunctionFactory & factory)
{
AggregateFunctionProperties properties = { .returns_default_when_only_null = false, .is_order_dependent = true };
factory.registerFunction("topK", { createAggregateFunctionTopK<false>, properties });
factory.registerFunction("topKWeighted", { createAggregateFunctionTopK<true>, properties });
}
}
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