greenplumn CDXLLogicalWindow 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLLogicalWindow.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLLogicalWindow.h
/
/ @doc:
/ Class for representing DXL logical window operators
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLLogicalWindow_H
#define GPDXL_CDXLLogicalWindow_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLLogical.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/operators/CDXLWindowSpec.h"
namespace gpdxl
{
/---------------------------------------------------------------------------
/ @class:
/ CDXLLogicalWindow
/
/ @doc:
/ Class for representing DXL logical window operators
/
/---------------------------------------------------------------------------
class CDXLLogicalWindow : public CDXLLogical
{
private:
/ array of window specifications
CDXLWindowSpecArray *m_window_spec_array;
/ private copy ctor
CDXLLogicalWindow(CDXLLogicalWindow &);
public:
/ctor
CDXLLogicalWindow(CMemoryPool *mp, CDXLWindowSpecArray *pdrgpdxlwinspec);
/dtor
~CDXLLogicalWindow() override;
/ accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
/ number of window specs
ULONG NumOfWindowSpecs() const;
/ return the window key at a given position
CDXLWindowSpec *GetWindowKeyAt(ULONG idx) const;
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
/ conversion function
static CDXLLogicalWindow *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopLogicalWindow == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLLogicalWindow *>(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_CDXLLogicalWindow_H
/ EOF
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