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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