ClickHouse/dbms/include/DB/Interpreters/InterpreterExistsQuery.h
2016-12-12 10:24:56 +03:00

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#pragma once
#include <DB/Interpreters/Context.h>
#include <DB/Interpreters/IInterpreter.h>
namespace DB
{
/** Проверить, существует ли таблица. Вернуть одну строку с одним столбцом result типа UInt8 со значением 0 или 1.
*/
class InterpreterExistsQuery : public IInterpreter
{
public:
InterpreterExistsQuery(ASTPtr query_ptr_, Context & context_)
: query_ptr(query_ptr_), context(context_) {}
BlockIO execute() override;
private:
ASTPtr query_ptr;
Context context;
Block getSampleBlock();
BlockInputStreamPtr executeImpl();
};
}