greenplumn CDXLPhysicalSort 源码
greenplumn CDXLPhysicalSort 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLPhysicalSort.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLPhysicalSort.h
//
// @doc:
// Class for representing DXL sort operators.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLPhysicalSort_H
#define GPDXL_CDXLPhysicalSort_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLPhysical.h"
namespace gpdxl
{
// indices of sort node elements in the children array
enum Edxlsort
{
EdxlsortIndexProjList = 0,
EdxlsortIndexFilter,
EdxlsortIndexSortColList,
EdxlsortIndexLimitCount,
EdxlsortIndexLimitOffset,
EdxlsortIndexChild,
EdxlsortIndexSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLPhysicalSort
//
// @doc:
// Class for representing DXL sort operators
//
//---------------------------------------------------------------------------
class CDXLPhysicalSort : public CDXLPhysical
{
private:
// whether sort discards duplicates
BOOL m_discard_duplicates;
public:
CDXLPhysicalSort(const CDXLPhysicalSort &) = delete;
// ctor/dtor
CDXLPhysicalSort(CMemoryPool *mp, BOOL discard_duplicates);
// accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
BOOL FDiscardDuplicates() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// conversion function
static CDXLPhysicalSort *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopPhysicalSort == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLPhysicalSort *>(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_CDXLPhysicalSort_H
// EOF
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