greenplumn CDXLPhysicalLimit 源码
greenplumn CDXLPhysicalLimit 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLPhysicalLimit.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLPhysicalLimit.h
//
// @doc:
// Class for representing DXL physical LIMIT operator
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLPhysicalLimit_H
#define GPDXL_CDXLPhysicalLimit_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLPhysical.h"
namespace gpdxl
{
// indices of limit elements in the children array
enum EdxlLimit
{
EdxllimitIndexProjList = 0,
EdxllimitIndexChildPlan,
EdxllimitIndexLimitCount,
EdxllimitIndexLimitOffset
};
//---------------------------------------------------------------------------
// @class:
// CDXLPhysicalLimit
//
// @doc:
// Class for representing DXL physical LIMIT operator
//
//---------------------------------------------------------------------------
class CDXLPhysicalLimit : public CDXLPhysical
{
private:
public:
CDXLPhysicalLimit(CDXLPhysicalLimit &) = delete;
// ctor/dtor
explicit CDXLPhysicalLimit(CMemoryPool *mp);
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
// conversion function
static CDXLPhysicalLimit *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopPhysicalLimit == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLPhysicalLimit *>(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_CDXLPhysicalLimit_H
//EOF
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