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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