ClickHouse/dbms/src/Interpreters/InterpreterExistsQuery.h
2019-03-11 17:01:45 +03:00

34 lines
602 B
C++

#pragma once
#include <Interpreters/IInterpreter.h>
#include <Parsers/IAST_fwd.h>
namespace DB
{
class Context;
/** Check that table exists. Return single row with single column "result" of type UInt8 and value 0 or 1.
*/
class InterpreterExistsQuery : public IInterpreter
{
public:
InterpreterExistsQuery(const ASTPtr & query_ptr_, const Context & context_)
: query_ptr(query_ptr_), context(context_) {}
BlockIO execute() override;
static Block getSampleBlock();
private:
ASTPtr query_ptr;
const Context & context;
BlockInputStreamPtr executeImpl();
};
}