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#pragma once
#include <AggregateFunctions/IAggregateFunction.h>
#include <Columns/ColumnArray.h>
#include <DataTypes/DataTypeArray.h>
#include <Common/assert_cast.h>
#include <base/arithmeticOverflow.h>
namespace DB
{
struct Settings;
namespace ErrorCodes
{
extern const int ARGUMENT_OUT_OF_BOUND;
}
template <typename Key>
class AggregateFunctionResample final : public IAggregateFunctionHelper<AggregateFunctionResample<Key>>
{
private:
/// Sanity threshold to avoid creation of too large arrays. The choice of this number is arbitrary.
static constexpr size_t max_elements = 1048576;
AggregateFunctionPtr nested_function;
size_t last_col;
Key begin;
Key end;
size_t step;
size_t total;
size_t align_of_data;
size_t size_of_data;
public:
AggregateFunctionResample(
AggregateFunctionPtr nested_function_,
Key begin_,
Key end_,
size_t step_,
const DataTypes & arguments,
const Array & params)
: IAggregateFunctionHelper<AggregateFunctionResample<Key>>{arguments, params, createResultType(nested_function_)}
, nested_function{nested_function_}
, last_col{arguments.size() - 1}
, begin{begin_}
, end{end_}
, step{step_}
, total{0}
, align_of_data{nested_function->alignOfData()}
, size_of_data{(nested_function->sizeOfData() + align_of_data - 1) / align_of_data * align_of_data}
{
// notice: argument types has been checked before
if (step == 0)
throw Exception(ErrorCodes::ARGUMENT_OUT_OF_BOUND, "The step given in function {} should not be zero", getName());
if (end < begin)
total = 0;
else
{
Key dif;
size_t sum;
if (common::subOverflow(end, begin, dif)
|| common::addOverflow(static_cast<size_t>(dif), step, sum))
{
throw Exception(ErrorCodes::ARGUMENT_OUT_OF_BOUND, "Overflow in internal computations in function {}. "
"Too large arguments", getName());
}
total = (sum - 1) / step; // total = (end - begin + step - 1) / step
}
if (total > max_elements)
throw Exception(ErrorCodes::ARGUMENT_OUT_OF_BOUND, "The range given in function {} contains too many elements",
getName());
}
String getName() const override
{
return nested_function->getName() + "Resample";
}
bool isState() const override
{
return nested_function->isState();
}
bool isVersioned() const override
{
return nested_function->isVersioned();
}
size_t getVersionFromRevision(size_t revision) const override
{
return nested_function->getVersionFromRevision(revision);
}
size_t getDefaultVersion() const override
{
return nested_function->getDefaultVersion();
}
bool allocatesMemoryInArena() const override
{
return nested_function->allocatesMemoryInArena();
}
bool hasTrivialDestructor() const override
{
return nested_function->hasTrivialDestructor();
}
size_t sizeOfData() const override
{
return total * size_of_data;
}
size_t alignOfData() const override
{
return align_of_data;
}
void create(AggregateDataPtr __restrict place) const override
{
for (size_t i = 0; i < total; ++i)
{
try
{
nested_function->create(place + i * size_of_data);
}
catch (...)
{
for (size_t j = 0; j < i; ++j)
nested_function->destroy(place + j * size_of_data);
throw;
}
}
}
void destroy(AggregateDataPtr __restrict place) const noexcept override
{
for (size_t i = 0; i < total; ++i)
nested_function->destroy(place + i * size_of_data);
}
void destroyUpToState(AggregateDataPtr __restrict place) const noexcept override
{
for (size_t i = 0; i < total; ++i)
nested_function->destroyUpToState(place + i * size_of_data);
}
void add(AggregateDataPtr __restrict place, const IColumn ** columns, size_t row_num, Arena * arena) const override
{
Key key;
if constexpr (static_cast<Key>(-1) < 0)
key = columns[last_col]->getInt(row_num);
else
key = columns[last_col]->getUInt(row_num);
if (key < begin || key >= end)
return;
size_t pos = (key - begin) / step;
nested_function->add(place + pos * size_of_data, columns, row_num, arena);
}
void merge(AggregateDataPtr __restrict place, ConstAggregateDataPtr rhs, Arena * arena) const override
{
for (size_t i = 0; i < total; ++i)
nested_function->merge(place + i * size_of_data, rhs + i * size_of_data, arena);
}
void serialize(ConstAggregateDataPtr __restrict place, WriteBuffer & buf, std::optional<size_t> version) const override
{
for (size_t i = 0; i < total; ++i)
nested_function->serialize(place + i * size_of_data, buf, version);
}
void deserialize(AggregateDataPtr __restrict place, ReadBuffer & buf, std::optional<size_t> version, Arena * arena) const override
{
for (size_t i = 0; i < total; ++i)
nested_function->deserialize(place + i * size_of_data, buf, version, arena);
}
static DataTypePtr createResultType(const AggregateFunctionPtr & nested_function_)
{
return std::make_shared<DataTypeArray>(nested_function_->getResultType());
}
template <bool merge>
void insertResultIntoImpl(AggregateDataPtr __restrict place, IColumn & to, Arena * arena) const
{
auto & col = assert_cast<ColumnArray &>(to);
auto & col_offsets = assert_cast<ColumnArray::ColumnOffsets &>(col.getOffsetsColumn());
for (size_t i = 0; i < total; ++i)
{
if constexpr (merge)
nested_function->insertMergeResultInto(place + i * size_of_data, col.getData(), arena);
else
nested_function->insertResultInto(place + i * size_of_data, col.getData(), arena);
}
col_offsets.getData().push_back(col.getData().size());
}
void insertResultInto(AggregateDataPtr __restrict place, IColumn & to, Arena * arena) const override
{
insertResultIntoImpl<false>(place, to, arena);
}
void insertMergeResultInto(AggregateDataPtr __restrict place, IColumn & to, Arena * arena) const override
{
insertResultIntoImpl<true>(place, to, arena);
}
AggregateFunctionPtr getNestedFunction() const override { return nested_function; }
};
}
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