ClickHouse/dbms/include/DB/Columns/ColumnAggregateFunction.h

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#pragma once
#include <DB/AggregateFunctions/IAggregateFunction.h>
#include <DB/Columns/ColumnVector.h>
namespace DB
{
/** Столбец, хранящий состояния агрегатных функций.
*/
class ColumnAggregateFunction : public ColumnVector<AggregateFunctionPtr>
{
public:
std::string getName() const { return "ColumnAggregateFunction"; }
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ColumnPtr cloneEmpty() const { return new ColumnAggregateFunction; };
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bool isNumeric() const { return false; }
Field operator[](size_t n) const
{
return data[n];
}
void cut(size_t start, size_t length)
{
if (length == 0 || start + length > data.size())
throw Exception("Parameters start = "
+ Poco::NumberFormatter::format(start) + ", length = "
+ Poco::NumberFormatter::format(length) + " are out of bound in IColumnVector<T>::cut() method"
" (data.size() = " + Poco::NumberFormatter::format(data.size()) + ").",
ErrorCodes::PARAMETER_OUT_OF_BOUND);
if (start == 0)
data.resize(length);
else
{
Container_t tmp(data.begin() + start, data.begin() + start + length);
tmp.swap(data);
}
}
void insert(const Field & x)
{
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data.push_back(boost::get<const AggregateFunctionPtr &>(x));
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}
int compareAt(size_t n, size_t m, const IColumn & rhs_) const
{
return 0;
}
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Permutation getPermutation() const
{
size_t s = data.size();
Permutation res(s);
for (size_t i = 0; i < s; ++i)
res[i] = i;
return res;
}
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};
}