greenplumn CPhysicalIndexOnlyScan 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalIndexOnlyScan.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2020 VMware, Inc.
/
/ @filename:
/ CPhysicalIndexOnlyScan.h
/
/ @doc:
/ Base class for physical index only scan operators
/---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalIndexOnlyScan_H
#define GPOPT_CPhysicalIndexOnlyScan_H
#include "gpos/base.h"
#include "gpopt/metadata/CIndexDescriptor.h"
#include "gpopt/operators/CPhysicalScan.h"
namespace gpopt
{
/ fwd declarations
class CName;
class CDistributionSpecHashed;
/---------------------------------------------------------------------------
/ @class:
/ CPhysicalIndexOnlyScan
/
/ @doc:
/ Base class for physical index only scan operators
/
/---------------------------------------------------------------------------
class CPhysicalIndexOnlyScan : public CPhysicalScan
{
private:
/ index descriptor
CIndexDescriptor *m_pindexdesc;
/ origin operator id -- gpos::ulong_max if operator was not generated via a transformation
ULONG m_ulOriginOpId;
/ order
COrderSpec *m_pos;
public:
CPhysicalIndexOnlyScan(const CPhysicalIndexOnlyScan &) = delete;
/ ctors
CPhysicalIndexOnlyScan(CMemoryPool *mp, CIndexDescriptor *pindexdesc,
CTableDescriptor *ptabdesc, ULONG ulOriginOpId,
const CName *pnameAlias, CColRefArray *colref_array,
COrderSpec *pos);
/ dtor
~CPhysicalIndexOnlyScan() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalIndexOnlyScan;
}
/ operator name
const CHAR *
SzId() const override
{
return "CPhysicalIndexOnlyScan";
}
/ table alias name
const CName &
NameAlias() const
{
return *m_pnameAlias;
}
/ origin operator id -- gpos::ulong_max if operator was not generated via a transformation
ULONG
UlOriginOpId() const
{
return m_ulOriginOpId;
}
/ operator specific hash function
ULONG HashValue() const override;
/ match function
BOOL Matches(COperator *pop) const override;
/ index descriptor
CIndexDescriptor *
Pindexdesc() const
{
return m_pindexdesc;
}
/ sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return true;
}
/-------------------------------------------------------------------------------------
/ Derived Plan Properties
/-------------------------------------------------------------------------------------
/ derive sort order
COrderSpec *
PosDerive(CMemoryPool *, /mp
CExpressionHandle & /exprhdl
) const override
{
m_pos->AddRef();
return m_pos;
}
CRewindabilitySpec *
PrsDerive(CMemoryPool *mp,
CExpressionHandle & / exprhdl
) const override
{
/ rewindability of output is always true
return GPOS_NEW(mp)
CRewindabilitySpec(CRewindabilitySpec::ErtMarkRestore,
CRewindabilitySpec::EmhtNoMotion);
}
/-------------------------------------------------------------------------------------
/ Enforced Properties
/-------------------------------------------------------------------------------------
/ return order property enforcing type for this operator
CEnfdProp::EPropEnforcingType EpetOrder(
CExpressionHandle &exprhdl, const CEnfdOrder *peo) const override;
/ conversion function
static CPhysicalIndexOnlyScan *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopPhysicalIndexOnlyScan == pop->Eopid());
return dynamic_cast<CPhysicalIndexOnlyScan *>(pop);
}
/ statistics derivation during costing
IStatistics *
PstatsDerive(CMemoryPool *, / mp
CExpressionHandle &, / exprhdl
CReqdPropPlan *, / prpplan
IStatisticsArray * /stats_ctxt
) const override
{
GPOS_ASSERT(
!"stats derivation during costing for index only scan is invalid");
return nullptr;
}
/ debug print
IOstream &OsPrint(IOstream &) const override;
}; / class CPhysicalIndexOnlyScan
} / namespace gpopt
#endif / !GPOPT_CPhysicalIndexOnlyScan_H
/ EOF
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