mariadb-columnstore-engine/dbcon/execplan/constantcolumn.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: constantcolumn.h 9679 2013-07-11 22:32:03Z zzhu $
*
*
***********************************************************************/
/** @file */

#ifndef CONSTANTCOLUMN_H
#define CONSTANTCOLUMN_H
#include <string>

#include "returnedcolumn.h"

namespace messageqcpp
{
class ByteStream;
}

/**
 * Namespace
 */
namespace execplan
{
class ConstantColumn;

/**
 * @brief A class to represent a constant return column
 *
 * This class is a specialization of class ReturnedColumn that
 * handles a constant column such as number and literal string.
 */
class ConstantColumn : public ReturnedColumn
{
public:

    enum TYPE
    {
        NUM,
        LITERAL,
        NULLDATA
    };

    /**
     * ctor
     */
    ConstantColumn();
    /**
     * ctor
     */
    ConstantColumn(const std::string& sql, TYPE type = LITERAL);
    /**
     * ctor
     */
    ConstantColumn(const int64_t val, TYPE type = NUM); //deprecate
    /**
     * ctor
     */
    ConstantColumn(const uint64_t val, TYPE type = NUM); // deprecate
    //There are more ctors below...

    /**
     * dtor
     */
    virtual ~ConstantColumn();

    /*
     * Accessor Methods
     */
    /**
     * accessor
     */
    inline unsigned int type() const
    {
        return fType;
    }
    /**
     * accessor
     */
    inline void type (unsigned int type)
    {
        fType = type;
    }
    /**
     * accessor
     */
    inline const std::string& constval() const
    {
        return fConstval;
    }
    /**
     * accessor
     */
    inline void constval(const std::string& constval)
    {
        fConstval = constval;
    }
    /**
     * accessor
     */
    virtual const std::string data() const;
    /**
     * accessor
     */
    virtual void data(const std::string data)
    {
        fData = data;
    }
    /**
     * accessor
     */
    virtual const std::string toString() const;

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

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

    virtual bool hasWindowFunc()
    {
        return false;
    }

    /** Constant column on the filte can always be moved into derived table */
    virtual void setDerivedTable()
    {
        fDerivedTable = "*";
    }

private:
    std::string fConstval;
    int fType;
    std::string fData;

    /***********************************************************
     *                  F&E framework                          *
     ***********************************************************/
public:
    /**
     * ctor
     */
    ConstantColumn(const std::string& sql, const double val);
    /**
     * ctor
     */
    ConstantColumn(const std::string& sql, const int64_t val, TYPE type = NUM);
    /**
     * ctor
     */
    ConstantColumn(const std::string& sql, const uint64_t val, TYPE type = NUM);
    /**
     * ctor
     */
    ConstantColumn(const std::string& sql, const IDB_Decimal& val);
    /**
     * copy ctor
     */
    ConstantColumn(const ConstantColumn& rhs);
    /**
     * F&E
     */
    virtual void evaluate(rowgroup::Row& row) {}
    /**
     * F&E
     */
    virtual void constructRegex();
    /**
     * F&E
     */
    virtual bool getBoolVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);
        return TreeNode::getBoolVal();
    }
    /**
     * F&E
     */
    virtual const std::string& getStrVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);
        return fResult.strVal;
    }
    /**
     * F&E
     */
    virtual int64_t getIntVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);
        return fResult.intVal;
    }
    /**
     * F&E
     */
    virtual uint64_t getUintVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);
        return fResult.uintVal;
    }
    /**
     * F&E
     */
    virtual float getFloatVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);
        return fResult.floatVal;
    }
    /**
     * F&E
     */
    virtual double getDoubleVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);
        return fResult.doubleVal;
    }
    /**
     * F&E
     */
    virtual IDB_Decimal getDecimalVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);
        return fResult.decimalVal;
    }
    /**
     * F&E
     */
    virtual int32_t getDateIntVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);

        if (!fResult.valueConverted)
        {
            fResult.intVal = dataconvert::DataConvert::stringToDate(fResult.strVal);
            fResult.valueConverted = true;
        }

        return fResult.intVal;
    }
    /**
     * F&E
     */
    virtual int64_t getDatetimeIntVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);

        if (!fResult.valueConverted)
        {
            fResult.intVal = dataconvert::DataConvert::stringToDatetime(fResult.strVal);
            fResult.valueConverted = true;
        }

        return fResult.intVal;
    }
    /**
     * F&E
     */
    virtual int64_t getTimeIntVal(rowgroup::Row& row, bool& isNull)
    {
        isNull = isNull || (fType == NULLDATA);

        if (!fResult.valueConverted)
        {
            fResult.intVal = dataconvert::DataConvert::stringToTime(fResult.strVal);
            fResult.valueConverted = true;
        }

        return fResult.intVal;
    }
    /**
     * F&E
     */
    inline float getFloatVal() const
    {
        return fResult.floatVal;
    }
    /**
     * F&E
     */
    inline  double getDoubleVal() const
    {
        return fResult.doubleVal;
    }

};

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

}
#endif //CONSTANTCOLUMN_H