mariadb-columnstore-engine/dbcon/execplan/logicoperator.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: logicoperator.h 9210 2013-01-21 14:10:42Z rdempsey $
*
*
***********************************************************************/
/** @file */

#ifndef LOGICOPERATOR_H
#define LOGICOPERATOR_H
#include <string>
#include <iosfwd>
#include <boost/shared_ptr.hpp>

//#include "expressionparser.h"
#include "operator.h"
#include "parsetree.h"

namespace messageqcpp
{
class ByteStream;
}

namespace rowgroup
{
class Row;
}

/**
 * Namespace
 */
namespace execplan
{
class ParseTree;
/**@brief a class to represent an operator
 *
 * This class is a representation of an predicate operator as
 * "AND, OR, LIKE" or arithmetic operator as "+, -, *, /, (, ),
 * "unary+, unary-, function(, function)"
 */

class LogicOperator : public Operator
{

    /**
     * Public stuff
     */
public:
    /**
     * Constructors
     */
    LogicOperator();
    LogicOperator(const std::string& operatorName);
    LogicOperator(const LogicOperator& rhs);

    /**
     * Destructors
     */
    virtual ~LogicOperator();

    /**
     * Accessor Methods
     */

    /** return a copy of this pointer
     *
     * deep copy of this pointer and return the copy
     */
    inline virtual LogicOperator* clone() const
    {
        return new LogicOperator (*this);
    }

    /**
     * The 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 LogicOperator& 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 LogicOperator& t) const;
    //template <typename result_t>
    //result_t evaluate(result_t op1, result_t op2);

    // F&E framework
    inline virtual bool getBoolVal(rowgroup::Row& row, bool& isNull, ParseTree* lop, ParseTree* rop)
    {
        switch (fOp)
        {
            case OP_AND:
                return (lop->getBoolVal(row, isNull) && rop->getBoolVal(row, isNull));

            case OP_OR:
            {
                if (lop->getBoolVal(row, isNull))
                    return true;

                isNull = false;
                //return (lop->getBoolVal(row, isNull) || rop->getBoolVal(row, isNull));
                return rop->getBoolVal(row, isNull);
            }

            case OP_XOR:
            {
                // Logical XOR. Returns NULL if either operand is NULL.
                // For non-NULL operands, evaluates to 1 if an odd number of operands is nonzero,
                // otherwise 0 is returned.
                bool lopv = lop->getBoolVal(row, isNull);

                if (isNull)
                    return false;

                bool ropv = rop->getBoolVal(row, isNull);

                if (isNull)
                    return false;

                if ((lopv && !ropv) || (ropv && !lopv))
                    return true;
                else
                    return false;
            }

            default:
                throw std::runtime_error("invalid logical operation");
        }
    }

    inline virtual void evaluate(rowgroup::Row& row, bool& isNull, ParseTree* lop, ParseTree* rop)
    {
        fResult.boolVal = getBoolVal(row, isNull, lop, rop);
    }

private:
    // default okay
    //Operator& operator=(const Operator& rhs);
    //std::string fData;

};

//typedef boost::shared_ptr<Operator> SOP;

std::ostream& operator<<(std::ostream& os, const LogicOperator& rhs);
}

#endif