NestedLoopJoinExecStream.h

Go to the documentation of this file.

/*
// $Id: //open/dev/fennel/exec/NestedLoopJoinExecStream.h#6 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2007-2009 The Eigenbase Project
// Copyright (C) 2007-2009 SQLstream, Inc.
// Copyright (C) 2007-2009 LucidEra, Inc.
// Portions Copyright (C) 2004-2009 John V. Sichi
//
// This program 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 approved by The Eigenbase Project.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef Fennel_NestedLoopJoinExecStream_Included
#define Fennel_NestedLoopJoinExecStream_Included

#include "fennel/exec/CartesianJoinExecStream.h"
#include "fennel/exec/DynamicParam.h"

FENNEL_BEGIN_NAMESPACE

struct FENNEL_EXEC_EXPORT NestedLoopJoinKey
{
    DynamicParamId dynamicParamId;
    uint leftAttributeOrdinal;

    NestedLoopJoinKey(DynamicParamId id, uint offset) :
        dynamicParamId(id),
        leftAttributeOrdinal(offset)
    {
    }
};

struct FENNEL_EXEC_EXPORT NestedLoopJoinExecStreamParams
    : public CartesianJoinExecStreamParams
{
    std::vector<NestedLoopJoinKey> leftJoinKeys;
};

class FENNEL_EXEC_EXPORT NestedLoopJoinExecStream
    : public CartesianJoinExecStream
{
    bool preProcessingDone;

    std::vector<NestedLoopJoinKey> leftJoinKeys;

    virtual bool checkNumInputs();

    virtual ExecStreamResult preProcessRightInput();

    virtual void processLeftInput();

public:
    // implement ExecStream
    virtual void prepare(NestedLoopJoinExecStreamParams const &params);
    virtual void open(bool restart);
};

FENNEL_END_NAMESPACE

#endif

// End NestedLoopJoinExecStream.h

---