greenplumn CPhysicalCorrelatedLeftSemiNLJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalCorrelatedLeftSemiNLJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CPhysicalCorrelatedLeftSemiNLJoin.h
/
/ @doc:
/ Physical Left Semi NLJ operator capturing correlated execution
/ for EXISTS subqueries
/---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalCorrelatedLeftSemiNLJoin_H
#define GPOPT_CPhysicalCorrelatedLeftSemiNLJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysicalLeftSemiNLJoin.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CPhysicalCorrelatedLeftSemiNLJoin
/
/ @doc:
/ Physical left semi NLJ operator capturing correlated execution for
/ EXISTS subqueries
/
/---------------------------------------------------------------------------
class CPhysicalCorrelatedLeftSemiNLJoin : public CPhysicalLeftSemiNLJoin
{
private:
/ columns from inner child used in correlated execution
CColRefArray *m_pdrgpcrInner;
/ origin subquery id
EOperatorId m_eopidOriginSubq;
public:
CPhysicalCorrelatedLeftSemiNLJoin(
const CPhysicalCorrelatedLeftSemiNLJoin &) = delete;
/ ctor
CPhysicalCorrelatedLeftSemiNLJoin(CMemoryPool *mp,
CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq)
: CPhysicalLeftSemiNLJoin(mp),
m_pdrgpcrInner(pdrgpcrInner),
m_eopidOriginSubq(eopidOriginSubq)
{
GPOS_ASSERT(nullptr != pdrgpcrInner);
SetDistrRequests(UlDistrRequestsForCorrelatedJoin());
GPOS_ASSERT(0 < UlDistrRequests());
}
/ dtor
~CPhysicalCorrelatedLeftSemiNLJoin() override
{
m_pdrgpcrInner->Release();
}
/ ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalCorrelatedLeftSemiNLJoin;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CPhysicalCorrelatedLeftSemiNLJoin";
}
/ match function
BOOL
Matches(COperator *pop) const override
{
if (pop->Eopid() == Eopid())
{
return m_pdrgpcrInner->Equals(
CPhysicalCorrelatedLeftSemiNLJoin::PopConvert(pop)
->PdrgPcrInner());
}
return false;
}
/ distribution matching type
CEnfdDistribution::EDistributionMatching
Edm(CReqdPropPlan *, / prppInput
ULONG, / child_index
CDrvdPropArray *, /pdrgpdpCtxt
ULONG / ulOptReq
) override
{
return CEnfdDistribution::EdmSatisfy;
}
CEnfdDistribution *
Ped(CMemoryPool *mp, CExpressionHandle &exprhdl, CReqdPropPlan *prppInput,
ULONG child_index, CDrvdPropArray *pdrgpdpCtxt, ULONG ulOptReq) override
{
return PedCorrelatedJoin(mp, exprhdl, prppInput, child_index,
pdrgpdpCtxt, ulOptReq);
}
/ compute required distribution of the n-th child
CDistributionSpec *
PdsRequired(CMemoryPool *, / mp
CExpressionHandle &, / exprhdl,
CDistributionSpec *, / pdsRequired,
ULONG, / child_index,
CDrvdPropArray *, / pdrgpdpCtxt,
ULONG /ulOptReq
) const override
{
GPOS_RAISE(
CException::ExmaInvalid, CException::ExmiInvalid,
GPOS_WSZ_LIT(
"PdsRequired should not be called for CPhysicalCorrelatedLeftSemiNLJoin"));
return nullptr;
}
/ compute required rewindability of the n-th child
CRewindabilitySpec *
PrsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CRewindabilitySpec *prsRequired, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt, ULONG ulOptReq) const override
{
return PrsRequiredCorrelatedJoin(mp, exprhdl, prsRequired, child_index,
pdrgpdpCtxt, ulOptReq);
}
/ return true if operator is a correlated NL Join
BOOL
FCorrelated() const override
{
return true;
}
/ return required inner columns
CColRefArray *
PdrgPcrInner() const override
{
return m_pdrgpcrInner;
}
/ origin subquery id
EOperatorId
EopidOriginSubq() const
{
return m_eopidOriginSubq;
}
/ print
IOstream &
OsPrint(IOstream &os) const override
{
os << this->SzId() << "(";
(void) CUtils::OsPrintDrgPcr(os, m_pdrgpcrInner);
os << ")";
return os;
}
/ conversion function
static CPhysicalCorrelatedLeftSemiNLJoin *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopPhysicalCorrelatedLeftSemiNLJoin == pop->Eopid());
return dynamic_cast<CPhysicalCorrelatedLeftSemiNLJoin *>(pop);
}
}; / class CPhysicalCorrelatedLeftSemiNLJoin
} / namespace gpopt
#endif / !GPOPT_CPhysicalCorrelatedLeftSemiNLJoin_H
/ EOF
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