the begginning

dbcon/execplan/rowcolumn.h

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+/* 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
+