greenplumn CDXLOperatorCost 源码
greenplumn CDXLOperatorCost 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLOperatorCost.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CDXLOperatorCost.h
//
// @doc:
// Representation of physical operator costs
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLOperatorCost_H
#define GPDXL_CDXLOperatorCost_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "gpos/string/CWStringDynamic.h"
namespace gpdxl
{
using namespace gpos;
// fwd decl
class CXMLSerializer;
//---------------------------------------------------------------------------
// @class:
// CDXLOperatorCost
//
// @doc:
// Class for representing costs of physical operators in the DXL tree
//
//---------------------------------------------------------------------------
class CDXLOperatorCost : public CRefCount
{
private:
// cost expended before fetching any tuples
CWStringDynamic *m_startup_cost_str;
// total cost (assuming all tuples fetched)
CWStringDynamic *m_total_cost_str;
// number of rows plan is expected to emit
CWStringDynamic *m_rows_out_str;
// average row width in bytes
CWStringDynamic *m_width_str;
public:
CDXLOperatorCost(const CDXLOperatorCost &) = delete;
// ctor/dtor
CDXLOperatorCost(CWStringDynamic *startup_cost_str,
CWStringDynamic *total_cost_str,
CWStringDynamic *rows_out_str, CWStringDynamic *width_str);
~CDXLOperatorCost() override;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer) const;
// accessors
const CWStringDynamic *GetStartUpCostStr() const;
const CWStringDynamic *GetTotalCostStr() const;
const CWStringDynamic *GetRowsOutStr() const;
const CWStringDynamic *GetWidthStr() const;
// set the number of rows
void SetRows(CWStringDynamic *str);
// set the total cost
void SetCost(CWStringDynamic *str);
};
} // namespace gpdxl
#endif // !GPDXL_CDXLOperatorCost_H
// EOF
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