greenplumn CDXLScalarLimitOffset 源码
greenplumn CDXLScalarLimitOffset 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarLimitOffset.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLScalarLimitOffset.h
//
// @doc:
// Class for representing DXL scalar LimitOffset (This is only used by CDXLPhysicalLimit)
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarLimitOffset_H
#define GPDXL_CDXLScalarLimitOffset_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarLimitOffset
//
// @doc:
// Class for representing DXL scalar LimitOffset
//
//---------------------------------------------------------------------------
class CDXLScalarLimitOffset : public CDXLScalar
{
private:
public:
CDXLScalarLimitOffset(const CDXLScalarLimitOffset &) = delete;
// ctor/dtor
explicit CDXLScalarLimitOffset(CMemoryPool *mp);
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the DXL operator
const CWStringConst *GetOpNameStr() const override;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
// conversion function
static CDXLScalarLimitOffset *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarLimitOffset == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarLimitOffset *>(dxl_op);
}
// 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 *node,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarLimitOffset_H
// EOF
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