greenplumn CEnfdOrder 源码
greenplumn CEnfdOrder 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CEnfdOrder.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CEnfdOrder.h
//
// @doc:
// Enforceable order property
//---------------------------------------------------------------------------
#ifndef GPOPT_CEnfdOrder_H
#define GPOPT_CEnfdOrder_H
#include "gpos/base.h"
#include "gpopt/base/CEnfdProp.h"
#include "gpopt/base/COrderSpec.h"
namespace gpopt
{
using namespace gpos;
// prototypes
class CPhysical;
//---------------------------------------------------------------------------
// @class:
// CEnfdOrder
//
// @doc:
// Enforceable order property;
//
//---------------------------------------------------------------------------
class CEnfdOrder : public CEnfdProp
{
public:
// type of order matching function
enum EOrderMatching
{
EomSatisfy = 0,
EomSentinel
};
private:
// required sort order
COrderSpec *m_pos;
// order matching type
EOrderMatching m_eom;
// names of order matching types
static const CHAR *m_szOrderMatching[EomSentinel];
public:
CEnfdOrder(const CEnfdOrder &) = delete;
// ctor
CEnfdOrder(COrderSpec *pos, EOrderMatching eom);
// dtor
~CEnfdOrder() override;
// hash function
ULONG HashValue() const override;
// check if the given order specification is compatible with the
// order specification of this object for the specified matching type
BOOL FCompatible(COrderSpec *pos) const;
// required order accessor
COrderSpec *
PosRequired() const
{
return m_pos;
}
// get order enforcing type for the given operator
EPropEnforcingType Epet(CExpressionHandle &exprhdl, CPhysical *popPhysical,
BOOL fOrderReqd) const;
// property spec accessor
CPropSpec *
Pps() const override
{
return m_pos;
}
// return matching type
EOrderMatching
Eom() const
{
return m_eom;
}
// matching function
BOOL
Matches(CEnfdOrder *peo)
{
GPOS_ASSERT(nullptr != peo);
return m_eom == peo->Eom() && m_pos->Matches(peo->PosRequired());
}
// print function
IOstream &OsPrint(IOstream &os) const override;
}; // class CEnfdOrder
} // namespace gpopt
#endif // !GPOPT_CEnfdOrder_H
// EOF
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