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#include <AggregateFunctions/IAggregateFunction.h>
#include <AggregateFunctions/AggregateFunctionFactory.h>
#include <AggregateFunctions/FactoryHelpers.h>
#include <AggregateFunctions/Helpers.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypesNumber.h>
#include <IO/ReadHelpers.h>
#include <IO/WriteHelpers.h>
namespace DB
{
struct Settings;
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
/** The function takes arguments x1, x2, ... xn, y. All arguments are bool.
* x arguments represents the fact that some category is true.
*
* It calculates how many times y was true and how many times y was false when every n-th category was true
* and the total number of times y was true and false.
*
* So, the size of the state is (n + 1) * 2 cells.
*/
class AggregateFunctionCategoricalIV final : public IAggregateFunctionHelper<AggregateFunctionCategoricalIV>
{
private:
using Counter = UInt64;
size_t category_count;
static Counter & counter(AggregateDataPtr __restrict place, size_t i, bool what)
{
return reinterpret_cast<Counter *>(place)[i * 2 + (what ? 1 : 0)];
}
static const Counter & counter(ConstAggregateDataPtr __restrict place, size_t i, bool what)
{
return reinterpret_cast<const Counter *>(place)[i * 2 + (what ? 1 : 0)];
}
public:
AggregateFunctionCategoricalIV(const DataTypes & arguments_, const Array & params_)
: IAggregateFunctionHelper<AggregateFunctionCategoricalIV>{arguments_, params_, createResultType()}
, category_count{arguments_.size() - 1}
{
// notice: argument types has been checked before
}
String getName() const override
{
return "categoricalInformationValue";
}
bool allocatesMemoryInArena() const override { return false; }
void create(AggregateDataPtr __restrict place) const override
{
memset(place, 0, sizeOfData());
}
void destroy(AggregateDataPtr __restrict) const noexcept override
{
// nothing
}
bool hasTrivialDestructor() const override
{
return true;
}
size_t sizeOfData() const override
{
return sizeof(Counter) * (category_count + 1) * 2;
}
size_t alignOfData() const override
{
return alignof(Counter);
}
void add(AggregateDataPtr __restrict place, const IColumn ** columns, size_t row_num, Arena *) const override
{
const auto * y_col = static_cast<const ColumnUInt8 *>(columns[category_count]);
bool y = y_col->getData()[row_num];
for (size_t i = 0; i < category_count; ++i)
{
const auto * x_col = static_cast<const ColumnUInt8 *>(columns[i]);
bool x = x_col->getData()[row_num];
if (x)
++counter(place, i, y);
}
++counter(place, category_count, y);
}
void merge(AggregateDataPtr __restrict place, ConstAggregateDataPtr rhs, Arena *) const override
{
for (size_t i = 0; i <= category_count; ++i)
{
counter(place, i, false) += counter(rhs, i, false);
counter(place, i, true) += counter(rhs, i, true);
}
}
void serialize(ConstAggregateDataPtr __restrict place, WriteBuffer & buf, std::optional<size_t> /* version */) const override
{
buf.write(place, sizeOfData());
}
void deserialize(AggregateDataPtr __restrict place, ReadBuffer & buf, std::optional<size_t> /* version */, Arena *) const override
{
buf.readStrict(place, sizeOfData());
}
static DataTypePtr createResultType()
{
return std::make_shared<DataTypeArray>(
std::make_shared<DataTypeNumber<Float64>>());
}
void insertResultInto(AggregateDataPtr __restrict place, IColumn & to, Arena *) const override /// NOLINT
{
auto & col = static_cast<ColumnArray &>(to);
auto & data_col = static_cast<ColumnFloat64 &>(col.getData());
auto & offset_col = static_cast<ColumnArray::ColumnOffsets &>(col.getOffsetsColumn());
data_col.reserve(data_col.size() + category_count);
Float64 sum_no = static_cast<Float64>(counter(place, category_count, false));
Float64 sum_yes = static_cast<Float64>(counter(place, category_count, true));
for (size_t i = 0; i < category_count; ++i)
{
Float64 no = static_cast<Float64>(counter(place, i, false));
Float64 yes = static_cast<Float64>(counter(place, i, true));
data_col.insertValue((no / sum_no - yes / sum_yes) * (log((no / sum_no) / (yes / sum_yes))));
}
offset_col.insertValue(data_col.size());
}
};
namespace
{
AggregateFunctionPtr createAggregateFunctionCategoricalIV(
const std::string & name,
const DataTypes & arguments,
const Array & params,
const Settings *)
{
assertNoParameters(name, params);
if (arguments.size() < 2)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Aggregate function {} requires two or more arguments",
name);
for (const auto & argument : arguments)
{
if (!WhichDataType(argument).isUInt8())
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "All the arguments of aggregate function {} should be UInt8",
name);
}
return std::make_shared<AggregateFunctionCategoricalIV>(arguments, params);
}
}
void registerAggregateFunctionCategoricalIV(AggregateFunctionFactory & factory)
{
AggregateFunctionProperties properties = { .returns_default_when_only_null = true };
factory.registerFunction("categoricalInformationValue", { createAggregateFunctionCategoricalIV, properties });
}
}
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