ClickHouse/dbms/src/AggregateFunctions/AggregateFunctionBitwise.h

83 lines
2.1 KiB
C++

#pragma once
#include <IO/WriteHelpers.h>
#include <IO/ReadHelpers.h>
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnVector.h>
#include <AggregateFunctions/IAggregateFunction.h>
namespace DB
{
template <typename T>
struct AggregateFunctionGroupBitOrData
{
T value = 0;
static const char * name() { return "groupBitOr"; }
void update(T x) { value |= x; }
};
template <typename T>
struct AggregateFunctionGroupBitAndData
{
T value = -1; /// Two's complement arithmetic, sign extension.
static const char * name() { return "groupBitAnd"; }
void update(T x) { value &= x; }
};
template <typename T>
struct AggregateFunctionGroupBitXorData
{
T value = 0;
static const char * name() { return "groupBitXor"; }
void update(T x) { value ^= x; }
};
/// Counts bitwise operation on numbers.
template <typename T, typename Data>
class AggregateFunctionBitwise final : public IAggregateFunctionDataHelper<Data, AggregateFunctionBitwise<T, Data>>
{
public:
String getName() const override { return Data::name(); }
DataTypePtr getReturnType() const override
{
return std::make_shared<DataTypeNumber<T>>();
}
void add(AggregateDataPtr place, const IColumn ** columns, size_t row_num, Arena *) const override
{
this->data(place).update(static_cast<const ColumnVector<T> &>(*columns[0]).getData()[row_num]);
}
void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs, Arena *) const override
{
this->data(place).update(this->data(rhs).value);
}
void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const override
{
writeBinary(this->data(place).value, buf);
}
void deserialize(AggregateDataPtr place, ReadBuffer & buf, Arena *) const override
{
readBinary(this->data(place).value, buf);
}
void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const override
{
static_cast<ColumnVector<T> &>(to).getData().push_back(this->data(place).value);
}
const char * getHeaderFilePath() const override { return __FILE__; }
};
}