mariadb-columnstore-engine/dbcon/execplan/rowcolumn.h

/* Copyright (C) 2014 InfiniDB, Inc.

   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; version 2 of
   the License.

   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., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */
/***********************************************************************
*   $Id: rowcolumn.h 6309 2010-03-04 19:33:12Z zzhu $
*
*
***********************************************************************/
/** @file */

#ifndef ROWCOLUMN_H
#define ROWCOLUMN_H
#include <string>
#include <vector>
#include <boost/shared_ptr.hpp>

#include "returnedcolumn.h"
#include "treenode.h"
#include "calpontsystemcatalog.h"
#include "dataconvert.h"

namespace messageqcpp
{
class ByteStream;
}

/**
 * Namespace
 */
namespace execplan
{

class ParseTree;
/**
 * @brief A class to represent a simple returned column
 *
 * This class is a specialization of class ReturnedColumn that handles
 * a group of columns. Mostly used in subquery context. This class is
 * internal to the connector. No serialization interface is provided.
 * The joblist factory will not recognize this class.
 */
class RowColumn : public ReturnedColumn
{

public:

    /**
     * Constructors
     */
    RowColumn(const uint32_t sessionID = 0);
    RowColumn(const RowColumn& rhs, const uint32_t sessionID = 0);

    /**
     * Destructor
     */
    virtual ~RowColumn();

    /**
     * Accessor Methods
     */
    const std::vector<SRCP>& columnVec() const
    {
        return fColumnVec;
    }
    void columnVec( const std::vector<SRCP>& columnVec )
    {
        fColumnVec = columnVec;
    }

    /** return a copy of this pointer
     *
     * deep copy of this pointer and return the copy
     */
    inline virtual RowColumn* clone() const
    {
        return new RowColumn (*this);
    }
    /**
     * Overloaded assignment operator
     */
    RowColumn& operator=(const RowColumn& rhs);

    /**
     * The serialize interface
     */
    //virtual void serialize(messageqcpp::ByteStream&) const;
    //virtual void unserialize(messageqcpp::ByteStream&);

    virtual const std::string toString() const;

    /**
     * Serialization interface
     */
    virtual void serialize(messageqcpp::ByteStream&) const;
    virtual void unserialize(messageqcpp::ByteStream&);


    /** @brief Do a deep, strict (as opposed to semantic) equivalence test
     *
     * Do a deep, strict (as opposed to semantic) equivalence test.
     * @return true iff every member of t is a duplicate copy of every member of this; false otherwise
     */
    virtual bool operator==(const TreeNode* t) const;

    /** @brief Do a deep, strict (as opposed to semantic) equivalence test
     *
     * Do a deep, strict (as opposed to semantic) equivalence test.
     * @return true iff every member of t is a duplicate copy of every member of this; false otherwise
     */
    bool operator==(const RowColumn& t) const;

    /** @brief Do a deep, strict (as opposed to semantic) equivalence test
     *
     * Do a deep, strict (as opposed to semantic) equivalence test.
     * @return false iff every member of t is a duplicate copy of every member of this; true otherwise
     */
    virtual bool operator!=(const TreeNode* t) const;

    /** @brief Do a deep, strict (as opposed to semantic) equivalence test
     *
     * Do a deep, strict (as opposed to semantic) equivalence test.
     * @return false iff every member of t is a duplicate copy of every member of this; true otherwise
     */
    bool operator!=(const RowColumn& t) const;
    virtual bool hasAggregate()
    {
        return false;
    }
    virtual bool hasWindowFunc()
    {
        return false;
    }

private:
    /**
     * Fields
     */
    std::vector<SRCP> fColumnVec;

};

/** dummy class. For the connector to use in gp_walk*/
class SubSelect : public ReturnedColumn
{
public:
    SubSelect(): ReturnedColumn() {}
    ~SubSelect() {}
    SubSelect* clone() const
    {
        return new SubSelect();
    }
    virtual bool hasAggregate()
    {
        return false;
    }
    virtual bool hasWindowFunc()
    {
        return false;
    }
    virtual const std::string toString() const;
};


/**
 * ostream operator
 */
std::ostream& operator<<(std::ostream& output, const RowColumn& rhs);

}
#endif //SIMPLECOLUMN_H