ClickHouse/dbms/include/DB/Storages/StorageSystemProcesses.h
2014-10-06 09:18:17 +04:00

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#pragma once
#include <Poco/SharedPtr.h>
#include <DB/Storages/IStorage.h>
#include <DB/Interpreters/Context.h>
namespace DB
{
using Poco::SharedPtr;
/** Реализует системную таблицу processes, которая позволяет получить информацию о запросах, исполняющихся в данный момент.
*/
class StorageSystemProcesses : public IStorage
{
public:
static StoragePtr create(const std::string & name_, const Context & context_);
std::string getName() const override { return "SystemProcesses"; }
std::string getTableName() const override { return name; }
const NamesAndTypesList & getColumnsList() const override { return columns; }
BlockInputStreams read(
const Names & column_names,
ASTPtr query,
const Settings & settings,
QueryProcessingStage::Enum & processed_stage,
size_t max_block_size = DEFAULT_BLOCK_SIZE,
unsigned threads = 1) override;
private:
const std::string name;
const Context & context;
NamesAndTypesList columns;
StorageSystemProcesses(const std::string & name_, const Context & context_);
};
}