ClickHouse/dbms/src/Storages/StorageSystemNumbers.cpp
2011-11-01 17:12:11 +00:00

57 lines
1.2 KiB
C++

#include <Poco/SharedPtr.h>
#include <DB/Core/Exception.h>
#include <DB/Core/ErrorCodes.h>
#include <DB/Columns/ColumnsNumber.h>
#include <DB/DataTypes/DataTypesNumberFixed.h>
#include <DB/Storages/StorageSystemNumbers.h>
namespace DB
{
using Poco::SharedPtr;
NumbersBlockInputStream::NumbersBlockInputStream(size_t block_size_) : block_size(block_size_), next(0)
{
}
Block NumbersBlockInputStream::readImpl()
{
Block res;
ColumnWithNameAndType column_with_name_and_type;
column_with_name_and_type.name = "number";
column_with_name_and_type.type = new DataTypeUInt64();
ColumnUInt64 * column = new ColumnUInt64(block_size);
ColumnUInt64::Container_t & vec = column->getData();
column_with_name_and_type.column = column;
for (size_t i = 0; i < block_size; ++i)
vec[i] = next++;
res.insert(column_with_name_and_type);
return res;
}
StorageSystemNumbers::StorageSystemNumbers(const std::string & name_)
: name(name_)
{
columns.push_back(NameAndTypePair("number", new DataTypeUInt64));
}
BlockInputStreamPtr StorageSystemNumbers::read(
const Names & column_names, ASTPtr query, size_t max_block_size)
{
check(column_names);
return new NumbersBlockInputStream(max_block_size);
}
}