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

#ifndef ARITHMETICCOLUMN_H
#define ARITHMETICCOLUMN_H
#include <string>
#include <iosfwd>
#include <stack>

#include "returnedcolumn.h"
#include "expressionparser.h"

/**
 * Namespace
 */
namespace execplan
{
class SimpleColumn;
class AggregateColumn;

/**
 * @brief A class to represent a arithmetic expression return column
 *
 * This class is a specialization of class ReturnedColumn that
 * handles an arithmetic expression.
 */
class ArithmeticColumn : public ReturnedColumn
{
public:
    ArithmeticColumn();
    ArithmeticColumn( const std::string& sql, const uint32_t sessionID = 0 );
    ArithmeticColumn( const ArithmeticColumn& rhs, const uint32_t sessionID = 0 );
    virtual ~ArithmeticColumn();

    inline ParseTree* expression() const
    {
        return fExpression;
    }

    /** get table alias name
     *
     * get the table alias name for this arithmetic function
     */
    inline const std::string& tableAlias () const
    {
        return fTableAlias;
    }

    /** set table alias name
     *
     * set the table alias name for this arithmetic function
     */
    inline void tableAlias (const std::string& tableAlias)
    {
        fTableAlias = tableAlias;
    }

    /** set the parse tree
     *
     * set the parse tree to expression.
     * @note this object takes ownership of the tree. The supplied pointer is set to null.
     */
    void expression (ParseTree*& expression);

    /**
     * get asc flag
     */
    inline const bool asc() const
    {
        return fAsc;
    }

    /**
     * set asc flag
     */
    inline void asc(const bool asc)
    {
        fAsc = asc;
    }

    /**
     * get SQL representation of this object
     */
    virtual const std::string data() const
    {
        return fData;
    }

    /**
     * set SQL representation of this object
     */
    virtual void data(const std::string data)
    {
        fData = data;
    }

    /**
     * virtual stream method
     */
    virtual const std::string toString() const;

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

    virtual bool hasAggregate();
    virtual bool hasWindowFunc();

    virtual void setDerivedTable();
    virtual void replaceRealCol(std::vector<SRCP>&);
    virtual const std::vector<SimpleColumn*>& simpleColumnList() const
    {
        return fSimpleColumnList;
    }
    virtual void setSimpleColumnList();

    /**
     * Return the table that the column arguments belong to.
     *
     * @return tablename, if all arguments belong to one table
     *         empty string "", if multiple tables are involved in this func
     */
    virtual bool singleTable(CalpontSystemCatalog::TableAliasName& tan);

private:
    std::string fTableAlias;   // table alias for this column
    bool fAsc;                 // asc flag for order by column
    std::string fData;

    /** build expression tree
     *
     * this function is called by the constructor. the incomming
     * sql string is parsed and tokenized and built into a
     * parse tree.
     */
    void buildTree();

    /** get next token from expression
     *
     * this is a util function used by buildTree(). next token string
     * is retrived from expression from curPos, until end char.
     * return the retrived token. curPos reference is updated to the
     * new position after end char
     */
    const std::string nextToken(std::string::size_type& curPos, char end) const;

    /***********************************************************
     *                 F&E framework                           *
     ***********************************************************/
public:
    virtual const std::string& getStrVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getStrVal(row, isNull);
    }

    virtual int64_t getIntVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getIntVal(row, isNull);
    }

    virtual uint64_t getUintVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getUintVal(row, isNull);
    }

    virtual float getFloatVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getFloatVal(row, isNull);
    }

    virtual double getDoubleVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getDoubleVal(row, isNull);
    }

    virtual IDB_Decimal getDecimalVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getDecimalVal(row, isNull);
    }

    virtual int32_t getDateIntVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getDateIntVal(row, isNull);
    }

    virtual int64_t getDatetimeIntVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getDatetimeIntVal(row, isNull);
    }

    virtual int64_t getTimeIntVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getTimeIntVal(row, isNull);
    }

    virtual bool getBoolVal(rowgroup::Row& row, bool& isNull)
    {
        return fExpression->getBoolVal(row, isNull);
    }


private:
    ParseTree* fExpression;
    void evaluate(rowgroup::Row& row) {}
};

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

}
#endif //ARITHMETICCOLUMN_H