71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
/*
|
|
----
|
|
This file is part of SECONDO.
|
|
|
|
Copyright (C) 2004-2009, University in Hagen, Faculty of Mathematics
|
|
and Computer Science, Database Systems for New Applications.
|
|
|
|
SECONDO is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
SECONDO is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with SECONDO; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
----
|
|
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "AlgebraTypes.h"
|
|
#include "CRel.h"
|
|
#include <cstdint>
|
|
#include "NestedList.h"
|
|
#include "Operator.h"
|
|
#include "TBlock.h"
|
|
|
|
namespace CRelAlgebra
|
|
{
|
|
namespace Operators
|
|
{
|
|
/*
|
|
Operator implementation of the 'feed' operator.
|
|
This operator returns a stream of tuple-block's from a column-oriented
|
|
relation.
|
|
|
|
The operator expects one parameter of type 'crel'.
|
|
|
|
The returned value is a stream of 'tblock'.
|
|
*/
|
|
class Feed : public Operator
|
|
{
|
|
public:
|
|
Feed();
|
|
|
|
private:
|
|
class State
|
|
{
|
|
public:
|
|
State(ArgVector args, Supplier s);
|
|
|
|
TBlock *Request();
|
|
|
|
private:
|
|
CRel &m_relation;
|
|
|
|
uint64_t m_blockIndex;
|
|
};
|
|
|
|
static const OperatorInfo info;
|
|
|
|
static ListExpr TypeMapping(ListExpr args);
|
|
};
|
|
}
|
|
} |