greenplumn CDXLWindowFrame 源码
greenplumn CDXLWindowFrame 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLWindowFrame.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLWindowFrame.h
//
// @doc:
// Class for representing DXL window frame
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLWindowFrame_H
#define GPDXL_CDXLWindowFrame_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
enum EdxlFrameSpec
{
EdxlfsRow = 0,
EdxlfsRange,
EdxlfsSentinel
};
enum EdxlFrameExclusionStrategy
{
EdxlfesNone = 0,
EdxlfesNulls,
EdxlfesCurrentRow,
EdxlfesGroup,
EdxlfesTies,
EdxlfesSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLWindowFrame
//
// @doc:
// Class for representing DXL window frame
//
//---------------------------------------------------------------------------
class CDXLWindowFrame : public CRefCount
{
private:
// row or range based window specification method
EdxlFrameSpec m_dxl_win_frame_spec;
// exclusion strategy
EdxlFrameExclusionStrategy m_dxl_frame_exclusion_strategy;
// scalar value representing the boundary leading
CDXLNode *m_dxlnode_leading;
// scalar value representing the boundary trailing
CDXLNode *m_dxlnode_trailing;
public:
CDXLWindowFrame(const CDXLWindowFrame &) = delete;
// ctor
CDXLWindowFrame(EdxlFrameSpec edxlfs,
EdxlFrameExclusionStrategy frame_exc_strategy,
CDXLNode *dxlnode_leading, CDXLNode *dxlnode_trailing);
//dtor
~CDXLWindowFrame() override;
EdxlFrameSpec
ParseDXLFrameSpec() const
{
return m_dxl_win_frame_spec;
}
// exclusion strategy
EdxlFrameExclusionStrategy
ParseFrameExclusionStrategy() const
{
return m_dxl_frame_exclusion_strategy;
}
// return window boundary trailing
CDXLNode *
PdxlnTrailing() const
{
return m_dxlnode_trailing;
}
// return window boundary leading
CDXLNode *
PdxlnLeading() const
{
return m_dxlnode_leading;
}
// return the string representation of the exclusion strategy
static const CWStringConst *PstrES(EdxlFrameExclusionStrategy edxles);
// return the string representation of the frame specification (row or range)
static const CWStringConst *PstrFS(EdxlFrameSpec edxlfs);
// serialize operator in DXL format
virtual void SerializeToDXL(CXMLSerializer *xml_serializer) const;
};
} // namespace gpdxl
#endif // !GPDXL_CDXLWindowFrame_H
// EOF
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