greenplumn CDXLScalarWindowFrameEdge 源码
greenplumn CDXLScalarWindowFrameEdge 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarWindowFrameEdge.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLScalarWindowFrameEdge.h
//
// @doc:
// Class for representing a DXL scalar window frame edge
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarWindowFrameEdge_H
#define GPDXL_CDXLScalarWindowFrameEdge_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
using namespace gpos;
enum EdxlFrameBoundary
{
EdxlfbUnboundedPreceding = 0,
EdxlfbBoundedPreceding,
EdxlfbCurrentRow,
EdxlfbUnboundedFollowing,
EdxlfbBoundedFollowing,
EdxlfbDelayedBoundedPreceding,
EdxlfbDelayedBoundedFollowing,
EdxlfbSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLScalarWindowFrameEdge
//
// @doc:
// Class for representing a DXL scalar window frame edge
//
//---------------------------------------------------------------------------
class CDXLScalarWindowFrameEdge : public CDXLScalar
{
private:
// identify if it is a leading or trailing edge
BOOL m_leading_edge;
// frame boundary
EdxlFrameBoundary m_dxl_frame_boundary;
public:
CDXLScalarWindowFrameEdge(const CDXLScalarWindowFrameEdge &) = delete;
// ctor
CDXLScalarWindowFrameEdge(CMemoryPool *mp, BOOL fLeading,
EdxlFrameBoundary frame_boundary);
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the DXL operator
const CWStringConst *GetOpNameStr() const override;
// is it a leading or trailing edge
BOOL
IsLeadingEdge() const
{
return m_leading_edge;
}
// return the dxl representation the frame boundary
EdxlFrameBoundary
ParseDXLFrameBoundary() const
{
return m_dxl_frame_boundary;
}
// return the string representation of frame boundary
static const CWStringConst *GetFrameBoundaryStr(
EdxlFrameBoundary frame_boundary);
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * //md_accessor
) const override
{
GPOS_ASSERT(!"Invalid function call for a container operator");
return false;
}
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
// conversion function
static CDXLScalarWindowFrameEdge *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarWindowFrameEdge == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarWindowFrameEdge *>(dxl_op);
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarWindowFrameEdge_H
// EOF
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