greenplumn CPhysicalLeftOuterIndexNLJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalLeftOuterIndexNLJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2017 VMware, Inc. or its affiliates.
/
/ Left outer index nested-loops join operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalLeftOuterIndexNLJoin_H
#define GPOPT_CPhysicalLeftOuterIndexNLJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysicalLeftOuterNLJoin.h"
namespace gpopt
{
class CPhysicalLeftOuterIndexNLJoin : public CPhysicalLeftOuterNLJoin
{
private:
/ columns from outer child used for index lookup in inner child
CColRefArray *m_pdrgpcrOuterRefs;
/ a copy of the original join predicate that has been pushed down to the inner side
CExpression *m_origJoinPred;
public:
CPhysicalLeftOuterIndexNLJoin(const CPhysicalLeftOuterIndexNLJoin &) =
delete;
/ ctor
CPhysicalLeftOuterIndexNLJoin(CMemoryPool *mp, CColRefArray *colref_array,
CExpression *origJoinPred);
/ dtor
~CPhysicalLeftOuterIndexNLJoin() override;
CEnfdProp::EPropEnforcingType EpetDistribution(
CExpressionHandle &exprhdl,
const CEnfdDistribution *ped) const override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalLeftOuterIndexNLJoin;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CPhysicalLeftOuterIndexNLJoin";
}
/ match function
BOOL Matches(COperator *pop) const override;
/ outer column references accessor
CColRefArray *
PdrgPcrOuterRefs() const
{
return m_pdrgpcrOuterRefs;
}
/ 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;
CEnfdDistribution *Ped(CMemoryPool *mp, CExpressionHandle &exprhdl,
CReqdPropPlan *prppInput, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulDistrReq) override;
/ execution order of children
EChildExecOrder
Eceo() const override
{
/ we optimize inner (right) child first to be able to match child hashed distributions
return EceoRightToLeft;
}
/ conversion function
static CPhysicalLeftOuterIndexNLJoin *
PopConvert(COperator *pop)
{
GPOS_ASSERT(EopPhysicalLeftOuterIndexNLJoin == pop->Eopid());
return dynamic_cast<CPhysicalLeftOuterIndexNLJoin *>(pop);
}
CExpression *
OrigJoinPred()
{
return m_origJoinPred;
}
}; / class CPhysicalLeftOuterIndexNLJoin
} / namespace gpopt
#endif / !GPOPT_CPhysicalLeftOuterIndexNLJoin_H
/ EOF
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