greenplumn CPhysicalInnerIndexNLJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalInnerIndexNLJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 VMware, Inc. or its affiliates.
/
/ @filename:
/ CPhysicalInnerIndexNLJoin.h
/
/ @doc:
/ Inner index nested-loops join operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalInnerIndexNLJoin_H
#define GPOPT_CPhysicalInnerIndexNLJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysicalInnerNLJoin.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CPhysicalInnerIndexNLJoin
/
/ @doc:
/ Inner index nested-loops join operator
/
/---------------------------------------------------------------------------
class CPhysicalInnerIndexNLJoin : public CPhysicalInnerNLJoin
{
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:
CPhysicalInnerIndexNLJoin(const CPhysicalInnerIndexNLJoin &) = delete;
/ ctor
CPhysicalInnerIndexNLJoin(CMemoryPool *mp, CColRefArray *colref_array,
CExpression *origJoinPred);
/ dtor
~CPhysicalInnerIndexNLJoin() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalInnerIndexNLJoin;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CPhysicalInnerIndexNLJoin";
}
/ 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 CPhysicalInnerIndexNLJoin *
PopConvert(COperator *pop)
{
GPOS_ASSERT(EopPhysicalInnerIndexNLJoin == pop->Eopid());
return dynamic_cast<CPhysicalInnerIndexNLJoin *>(pop);
}
CExpression *
OrigJoinPred()
{
return m_origJoinPred;
}
}; / class CPhysicalInnerIndexNLJoin
} / namespace gpopt
#endif / !GPOPT_CPhysicalInnerIndexNLJoin_H
/ EOF
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