greenplumn CDXLPhysicalSubqueryScan 源码
greenplumn CDXLPhysicalSubqueryScan 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLPhysicalSubqueryScan.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLPhysicalSubqueryScan.h
//
// @doc:
// Class for representing DXL physical subquery scan (projection) operators.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLPhysicalSubqueryScan_H
#define GPDXL_CDXLPhysicalSubqueryScan_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLPhysical.h"
#include "naucrates/md/CMDName.h"
namespace gpdxl
{
using namespace gpmd;
// indices of subquery scan elements in the children array
enum Edxlsubqscan
{
EdxlsubqscanIndexProjList = 0,
EdxlsubqscanIndexFilter,
EdxlsubqscanIndexChild,
EdxlsubqscanIndexSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLPhysicalSubqueryScan
//
// @doc:
// Class for representing DXL physical subquery scan (projection) operators
//
//---------------------------------------------------------------------------
class CDXLPhysicalSubqueryScan : public CDXLPhysical
{
private:
// name for the subquery scan node (corresponding to name in GPDB's SubqueryScan)
CMDName *m_mdname_alias;
public:
CDXLPhysicalSubqueryScan(CDXLPhysicalSubqueryScan &) = delete;
// ctor/dtor
CDXLPhysicalSubqueryScan(CMemoryPool *mp, CMDName *mdname);
~CDXLPhysicalSubqueryScan() override;
// accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
const CMDName *MdName();
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// conversion function
static CDXLPhysicalSubqueryScan *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopPhysicalSubqueryScan == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLPhysicalSubqueryScan *>(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_CDXLPhysicalSubqueryScan_H
// EOF
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