ClickHouse/dbms/include/DB/Storages/StorageSystemNumbers.h
Andrey Mironov 3ebfd2fb7f dbms: pass proper context into Storage::read(). [#METR-14179]
This reverts commit 34b3f738a67432b44f6f69238dd1529535984d1a.
2014-12-17 17:19:07 +03:00

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#pragma once
#include <Poco/SharedPtr.h>
#include <DB/Storages/IStorage.h>
namespace DB
{
using Poco::SharedPtr;
/** Реализует хранилище для системной таблицы Numbers.
* Таблица содержит единственный столбец number UInt64.
* Из этой таблицы можно прочитать все натуральные числа, начиная с 0 (до 2^64 - 1, а потом заново).
*/
class StorageSystemNumbers : public IStorage
{
public:
static StoragePtr create(const std::string & name_, bool multithreaded_ = false);
std::string getName() const override { return "SystemNumbers"; }
std::string getTableName() const override { return name; }
const NamesAndTypesList & getColumnsListImpl() const override { return columns; }
BlockInputStreams read(
const Names & column_names,
ASTPtr query,
const Context & context,
const Settings & settings,
QueryProcessingStage::Enum & processed_stage,
size_t max_block_size = DEFAULT_BLOCK_SIZE,
unsigned threads = 1) override;
private:
const std::string name;
NamesAndTypesList columns;
bool multithreaded;
StorageSystemNumbers(const std::string & name_, bool multithreaded_);
};
}