greenplumn CEnfdRewindability 源码
greenplumn CEnfdRewindability 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CEnfdRewindability.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CEnfdRewindability.h
//
// @doc:
// Enforceable rewindability property
//---------------------------------------------------------------------------
#ifndef GPOPT_CEnfdRewindability_H
#define GPOPT_CEnfdRewindability_H
#include "gpos/base.h"
#include "gpopt/base/CEnfdProp.h"
#include "gpopt/base/CRewindabilitySpec.h"
namespace gpopt
{
using namespace gpos;
// prototypes
class CPhysical;
//---------------------------------------------------------------------------
// @class:
// CEnfdRewindability
//
// @doc:
// Enforceable rewindability property;
//
//---------------------------------------------------------------------------
class CEnfdRewindability : public CEnfdProp
{
public:
// type of rewindability matching function
enum ERewindabilityMatching
{
ErmSatisfy = 0,
ErmSentinel
};
private:
// required rewindability
CRewindabilitySpec *m_prs;
// rewindability matching type
ERewindabilityMatching m_erm;
// names of rewindability matching types
static const CHAR *m_szRewindabilityMatching[ErmSentinel];
public:
CEnfdRewindability(const CEnfdRewindability &) = delete;
// ctor
CEnfdRewindability(CRewindabilitySpec *prs, ERewindabilityMatching erm);
// dtor
~CEnfdRewindability() override;
// hash function
ULONG HashValue() const override;
// check if the given rewindability specification is compatible with the
// rewindability specification of this object for the specified matching type
BOOL FCompatible(CRewindabilitySpec *pos) const;
// required rewindability accessor
CRewindabilitySpec *
PrsRequired() const
{
return m_prs;
}
// get rewindability enforcing type for the given operator
EPropEnforcingType Epet(CExpressionHandle &exprhdl, CPhysical *popPhysical,
BOOL fRewindabilityReqd) const;
// property spec accessor
CPropSpec *
Pps() const override
{
return m_prs;
}
// matching type accessor
ERewindabilityMatching
Erm() const
{
return m_erm;
}
// matching function
BOOL
Matches(CEnfdRewindability *per)
{
GPOS_ASSERT(nullptr != per);
return m_erm == per->Erm() && m_prs->Matches(per->PrsRequired());
}
// print function
IOstream &OsPrint(IOstream &os) const override;
}; // class CEnfdRewindability
} // namespace gpopt
#endif // !GPOPT_CEnfdRewindability_H
// EOF
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