greenplumn CDXLLogicalProject 源码
greenplumn CDXLLogicalProject 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLLogicalProject.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLLogicalProject.h
//
// @doc:
// Class for representing DXL logical project operators
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLLogicalProject_H
#define GPDXL_CDXLLogicalProject_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLLogical.h"
namespace gpdxl
{
//---------------------------------------------------------------------------
// @class:
// CDXLLogicalProject
//
// @doc:
// Class for representing DXL logical project operators
//
//---------------------------------------------------------------------------
class CDXLLogicalProject : public CDXLLogical
{
private:
// alias name
const CMDName *m_mdname_alias;
public:
CDXLLogicalProject(CDXLLogicalProject &) = delete;
// ctor
explicit CDXLLogicalProject(CMemoryPool *);
// accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
const CMDName *MdName() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxl_node) const override;
// set alias name
void SetAliasName(CMDName *);
// conversion function
static CDXLLogicalProject *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopLogicalProject == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLLogicalProject *>(dxl_op);
}
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *, BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLLogicalProject_H
// EOF
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