greenplumn CDXLPhysicalWindow 源码
greenplumn CDXLPhysicalWindow 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLPhysicalWindow.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLPhysicalWindow.h
//
// @doc:
// Class for representing DXL window operators
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLPhysicalWindow_H
#define GPDXL_CDXLPhysicalWindow_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/operators/CDXLPhysical.h"
#include "naucrates/dxl/operators/CDXLWindowKey.h"
namespace gpdxl
{
// indices of window elements in the children array
enum Edxlwindow
{
EdxlwindowIndexProjList = 0,
EdxlwindowIndexFilter,
EdxlwindowIndexChild,
EdxlwindowIndexSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLPhysicalWindow
//
// @doc:
// Class for representing DXL window operators
//
//---------------------------------------------------------------------------
class CDXLPhysicalWindow : public CDXLPhysical
{
private:
// partition columns
ULongPtrArray *m_part_by_colid_array;
// window keys
CDXLWindowKeyArray *m_dxl_window_key_array;
public:
CDXLPhysicalWindow(CDXLPhysicalWindow &) = delete;
//ctor
CDXLPhysicalWindow(CMemoryPool *mp, ULongPtrArray *part_by_colid_array,
CDXLWindowKeyArray *window_key_array);
//dtor
~CDXLPhysicalWindow() override;
// accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
// number of partition columns
ULONG PartByColsCount() const;
// return partition columns
const ULongPtrArray *
GetPartByColsArray() const
{
return m_part_by_colid_array;
}
// number of window keys
ULONG WindowKeysCount() const;
// return the window key at a given position
CDXLWindowKey *GetDXLWindowKeyAt(ULONG ulPos) const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// conversion function
static CDXLPhysicalWindow *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopPhysicalWindow == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLPhysicalWindow *>(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_CDXLPhysicalWindow_H
// EOF
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