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#pragma once
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnsNumber.h>
#include <IO/ReadHelpers.h>
#include <IO/WriteHelpers.h>
#include <AggregateFunctions/Helpers.h>
#include <AggregateFunctions/IAggregateFunction.h>
#include <Common/assert_cast.h>
namespace DB
{
struct Settings;
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
}
/** Tracks the leftmost and rightmost (x, y) data points.
*/
struct AggregateFunctionBoundingRatioData
{
struct Point
{
Float64 x;
Float64 y;
};
bool empty = true;
Point left;
Point right;
void add(Float64 x, Float64 y)
{
Point point{x, y};
if (empty)
{
left = point;
right = point;
empty = false;
}
else if (point.x < left.x)
{
left = point;
}
else if (point.x > right.x)
{
right = point;
}
}
void merge(const AggregateFunctionBoundingRatioData & other)
{
if (empty)
{
*this = other;
}
else
{
if (other.left.x < left.x)
left = other.left;
if (other.right.x > right.x)
right = other.right;
}
}
void serialize(WriteBuffer & buf) const;
void deserialize(ReadBuffer & buf);
};
template <std::endian endian>
inline void transformEndianness(AggregateFunctionBoundingRatioData::Point & p)
{
transformEndianness<endian>(p.x);
transformEndianness<endian>(p.y);
}
void AggregateFunctionBoundingRatioData::serialize(WriteBuffer & buf) const
{
writeBinaryLittleEndian(empty, buf);
if (!empty)
{
writeBinaryLittleEndian(left, buf);
writeBinaryLittleEndian(right, buf);
}
}
void AggregateFunctionBoundingRatioData::deserialize(ReadBuffer & buf)
{
readBinaryLittleEndian(empty, buf);
if (!empty)
{
readBinaryLittleEndian(left, buf);
readBinaryLittleEndian(right, buf);
}
}
inline void writeBinary(const AggregateFunctionBoundingRatioData::Point & p, WriteBuffer & buf)
{
writePODBinary(p, buf);
}
inline void readBinary(AggregateFunctionBoundingRatioData::Point & p, ReadBuffer & buf)
{
readPODBinary(p, buf);
}
class AggregateFunctionBoundingRatio final : public IAggregateFunctionDataHelper<AggregateFunctionBoundingRatioData, AggregateFunctionBoundingRatio>
{
private:
/** Calculates the slope of a line between leftmost and rightmost data points.
* (y2 - y1) / (x2 - x1)
*/
static Float64 NO_SANITIZE_UNDEFINED getBoundingRatio(const AggregateFunctionBoundingRatioData & data)
{
if (data.empty)
return std::numeric_limits<Float64>::quiet_NaN();
return (data.right.y - data.left.y) / (data.right.x - data.left.x);
}
public:
String getName() const override
{
return "boundingRatio";
}
explicit AggregateFunctionBoundingRatio(const DataTypes & arguments)
: IAggregateFunctionDataHelper<AggregateFunctionBoundingRatioData, AggregateFunctionBoundingRatio>(arguments, {}, std::make_shared<DataTypeFloat64>())
{
const auto * x_arg = arguments.at(0).get();
const auto * y_arg = arguments.at(1).get();
if (!x_arg->isValueRepresentedByNumber() || !y_arg->isValueRepresentedByNumber())
throw Exception(ErrorCodes::BAD_ARGUMENTS,
"Illegal types of arguments of aggregate function {}, must have number representation.",
getName());
}
bool allocatesMemoryInArena() const override { return false; }
void add(AggregateDataPtr __restrict place, const IColumn ** columns, const size_t row_num, Arena *) const override
{
/// NOTE Slightly inefficient.
const auto x = columns[0]->getFloat64(row_num);
const auto y = columns[1]->getFloat64(row_num);
data(place).add(x, y);
}
void merge(AggregateDataPtr __restrict place, ConstAggregateDataPtr rhs, Arena *) const override
{
data(place).merge(data(rhs));
}
void serialize(ConstAggregateDataPtr __restrict place, WriteBuffer & buf, std::optional<size_t> /* version */) const override
{
data(place).serialize(buf);
}
void deserialize(AggregateDataPtr __restrict place, ReadBuffer & buf, std::optional<size_t> /* version */, Arena *) const override
{
data(place).deserialize(buf);
}
void insertResultInto(AggregateDataPtr __restrict place, IColumn & to, Arena *) const override
{
assert_cast<ColumnFloat64 &>(to).getData().push_back(getBoundingRatio(data(place)));
}
};
}
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