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#pragma once
#include <type_traits>
#include <IO/ReadHelpers.h>
#include <IO/WriteHelpers.h>
#include <Columns/ColumnVector.h>
#include <DataTypes/DataTypesDecimal.h>
#include <DataTypes/DataTypesNumber.h>
#include <AggregateFunctions/IAggregateFunction.h>
namespace DB
{
template <typename ValueType, typename TimestampType>
struct AggregationFunctionDeltaSumTimestampData
{
ValueType sum = 0;
ValueType first = 0;
ValueType last = 0;
TimestampType first_ts = 0;
TimestampType last_ts = 0;
bool seen = false;
};
template <typename ValueType, typename TimestampType>
class AggregationFunctionDeltaSumTimestamp final
: public IAggregateFunctionDataHelper<
AggregationFunctionDeltaSumTimestampData<ValueType, TimestampType>,
AggregationFunctionDeltaSumTimestamp<ValueType, TimestampType>
>
{
public:
AggregationFunctionDeltaSumTimestamp(const DataTypes & arguments, const Array & params)
: IAggregateFunctionDataHelper<
AggregationFunctionDeltaSumTimestampData<ValueType, TimestampType>,
AggregationFunctionDeltaSumTimestamp<ValueType, TimestampType>
>{arguments, params, createResultType()}
{}
AggregationFunctionDeltaSumTimestamp()
: IAggregateFunctionDataHelper<
AggregationFunctionDeltaSumTimestampData<ValueType, TimestampType>,
AggregationFunctionDeltaSumTimestamp<ValueType, TimestampType>
>{}
{}
bool allocatesMemoryInArena() const override { return false; }
String getName() const override { return "deltaSumTimestamp"; }
static DataTypePtr createResultType() { return std::make_shared<DataTypeNumber<ValueType>>(); }
void NO_SANITIZE_UNDEFINED ALWAYS_INLINE add(AggregateDataPtr __restrict place, const IColumn ** columns, size_t row_num, Arena *) const override
{
auto value = assert_cast<const ColumnVector<ValueType> &>(*columns[0]).getData()[row_num];
auto ts = assert_cast<const ColumnVector<TimestampType> &>(*columns[1]).getData()[row_num];
if ((this->data(place).last < value) && this->data(place).seen)
{
this->data(place).sum += (value - this->data(place).last);
}
this->data(place).last = value;
this->data(place).last_ts = ts;
if (!this->data(place).seen)
{
this->data(place).first = value;
this->data(place).seen = true;
this->data(place).first_ts = ts;
}
}
// before returns true if lhs is before rhs or false if it is not or can't be determined
bool ALWAYS_INLINE before (
const AggregationFunctionDeltaSumTimestampData<ValueType, TimestampType> * lhs,
const AggregationFunctionDeltaSumTimestampData<ValueType, TimestampType> * rhs
) const
{
if (lhs->last_ts < rhs->first_ts)
{
return true;
}
if (lhs->last_ts == rhs->first_ts && (lhs->last_ts < rhs->last_ts || lhs->first_ts < rhs->first_ts))
{
return true;
}
return false;
}
void NO_SANITIZE_UNDEFINED ALWAYS_INLINE merge(AggregateDataPtr __restrict place, ConstAggregateDataPtr rhs, Arena *) const override
{
auto place_data = &this->data(place);
auto rhs_data = &this->data(rhs);
if (!place_data->seen && rhs_data->seen)
{
place_data->sum = rhs_data->sum;
place_data->seen = true;
place_data->first = rhs_data->first;
place_data->first_ts = rhs_data->first_ts;
place_data->last = rhs_data->last;
place_data->last_ts = rhs_data->last_ts;
}
else if (place_data->seen && !rhs_data->seen)
return;
else if (before(place_data, rhs_data))
{
// This state came before the rhs state
if (rhs_data->first > place_data->last)
place_data->sum += (rhs_data->first - place_data->last);
place_data->sum += rhs_data->sum;
place_data->last = rhs_data->last;
place_data->last_ts = rhs_data->last_ts;
}
else if (before(rhs_data, place_data))
{
// This state came after the rhs state
if (place_data->first > rhs_data->last)
place_data->sum += (place_data->first - rhs_data->last);
place_data->sum += rhs_data->sum;
place_data->first = rhs_data->first;
place_data->first_ts = rhs_data->first_ts;
}
else
{
// If none of those conditions matched, it means both states we are merging have all
// same timestamps. We have to pick either the smaller or larger value so that the
// result is deterministic.
if (place_data->first < rhs_data->first)
{
place_data->first = rhs_data->first;
place_data->last = rhs_data->last;
}
}
}
void serialize(ConstAggregateDataPtr __restrict place, WriteBuffer & buf, std::optional<size_t> /* version */) const override
{
writeBinaryLittleEndian(this->data(place).sum, buf);
writeBinaryLittleEndian(this->data(place).first, buf);
writeBinaryLittleEndian(this->data(place).first_ts, buf);
writeBinaryLittleEndian(this->data(place).last, buf);
writeBinaryLittleEndian(this->data(place).last_ts, buf);
writeBinaryLittleEndian(this->data(place).seen, buf);
}
void deserialize(AggregateDataPtr __restrict place, ReadBuffer & buf, std::optional<size_t> /* version */, Arena *) const override
{
readBinaryLittleEndian(this->data(place).sum, buf);
readBinaryLittleEndian(this->data(place).first, buf);
readBinaryLittleEndian(this->data(place).first_ts, buf);
readBinaryLittleEndian(this->data(place).last, buf);
readBinaryLittleEndian(this->data(place).last_ts, buf);
readBinaryLittleEndian(this->data(place).seen, buf);
}
void insertResultInto(AggregateDataPtr __restrict place, IColumn & to, Arena *) const override
{
assert_cast<ColumnVector<ValueType> &>(to).getData().push_back(this->data(place).sum);
}
};
}
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