ClickHouse/dbms/include/DB/AggregateFunctions/AggregateFunctionGroupArray.h

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#pragma once
#include <DB/IO/WriteHelpers.h>
#include <DB/IO/ReadHelpers.h>
#include <DB/DataTypes/DataTypeArray.h>
#include <DB/DataTypes/DataTypesNumberFixed.h>
#include <DB/Columns/ColumnVector.h>
#include <DB/Columns/ColumnArray.h>
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#include <DB/AggregateFunctions/IUnaryAggregateFunction.h>
#define AGGREGATE_FUNCTION_GROUP_ARRAY_MAX_ARRAY_SIZE 0xFFFFFF
namespace DB
{
/// Частный случай - реализация для числовых типов.
template <typename T>
struct AggregateFunctionGroupArrayDataNumeric
{
/// Сразу будет выделена память на несколько элементов так, чтобы состояние занимало 64 байта.
static constexpr size_t bytes_in_arena = 64 - sizeof(PODArray<T>);
using Array = PODArray<T, bytes_in_arena / sizeof(T), AllocatorWithStackMemory<Allocator<false>, bytes_in_arena>>;
Array value;
};
/// Общий случай (неэффективно). NOTE Можно ещё реализовать частный случай для строк.
struct AggregateFunctionGroupArrayDataGeneric
{
Array value; /// TODO Добавить MemoryTracker
};
template <typename T>
class AggregateFunctionGroupArrayNumeric final
: public IUnaryAggregateFunction<AggregateFunctionGroupArrayDataNumeric<T>, AggregateFunctionGroupArrayNumeric<T>>
{
public:
String getName() const override { return "groupArray"; }
DataTypePtr getReturnType() const override
{
return new DataTypeArray(new typename DataTypeFromFieldType<T>::Type);
}
void setArgument(const DataTypePtr & argument)
{
}
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void addImpl(AggregateDataPtr place, const IColumn & column, size_t row_num) const
{
this->data(place).value.push_back(static_cast<const ColumnVector<T> &>(column).getData()[row_num]);
}
void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs) const override
{
this->data(place).value.insert(this->data(rhs).value.begin(), this->data(rhs).value.end());
}
void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const override
{
const auto & value = this->data(place).value;
size_t size = value.size();
writeVarUInt(size, buf);
buf.write(reinterpret_cast<const char *>(&value[0]), size * sizeof(value[0]));
}
void deserializeMerge(AggregateDataPtr place, ReadBuffer & buf) const override
{
size_t size = 0;
readVarUInt(size, buf);
if (size > AGGREGATE_FUNCTION_GROUP_ARRAY_MAX_ARRAY_SIZE)
throw Exception("Too large array size", ErrorCodes::TOO_LARGE_ARRAY_SIZE);
auto & value = this->data(place).value;
size_t old_size = value.size();
value.resize(old_size + size);
buf.read(reinterpret_cast<char *>(&value[old_size]), size * sizeof(value[0]));
}
void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const override
{
const auto & value = this->data(place).value;
size_t size = value.size();
ColumnArray & arr_to = static_cast<ColumnArray &>(to);
ColumnArray::Offsets_t & offsets_to = arr_to.getOffsets();
offsets_to.push_back((offsets_to.size() == 0 ? 0 : offsets_to.back()) + size);
typename ColumnVector<T>::Container_t & data_to = static_cast<ColumnVector<T> &>(arr_to.getData()).getData();
data_to.insert(this->data(place).value.begin(), this->data(place).value.end());
}
};
/// Складывает все значения в массив, общий случай. Реализовано неэффективно.
class AggregateFunctionGroupArrayGeneric final
: public IUnaryAggregateFunction<AggregateFunctionGroupArrayDataGeneric, AggregateFunctionGroupArrayGeneric>
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{
private:
DataTypePtr type;
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public:
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String getName() const override { return "groupArray"; }
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DataTypePtr getReturnType() const override
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{
return new DataTypeArray(type);
}
void setArgument(const DataTypePtr & argument)
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{
type = argument;
}
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void addImpl(AggregateDataPtr place, const IColumn & column, size_t row_num) const
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{
data(place).value.push_back(Array::value_type());
column.get(row_num, data(place).value.back());
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}
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void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs) const override
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{
data(place).value.insert(data(place).value.end(), data(rhs).value.begin(), data(rhs).value.end());
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}
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void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const override
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{
const Array & value = data(place).value;
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size_t size = value.size();
writeVarUInt(size, buf);
for (size_t i = 0; i < size; ++i)
type->serializeBinary(value[i], buf);
}
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void deserializeMerge(AggregateDataPtr place, ReadBuffer & buf) const override
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{
size_t size = 0;
readVarUInt(size, buf);
if (size > AGGREGATE_FUNCTION_GROUP_ARRAY_MAX_ARRAY_SIZE)
throw Exception("Too large array size", ErrorCodes::TOO_LARGE_ARRAY_SIZE);
Array & value = data(place).value;
size_t old_size = value.size();
value.resize(old_size + size);
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for (size_t i = 0; i < size; ++i)
type->deserializeBinary(value[old_size + i], buf);
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}
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void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const override
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{
to.insert(data(place).value);
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}
};
#undef AGGREGATE_FUNCTION_GROUP_ARRAY_MAX_ARRAY_SIZE
}