greenplumn CLogicalIndexApply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalIndexApply.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2018 VMware, Inc. or its affiliates.
/
/ Base Index Apply operator for Inner and Outer Join;
/ a variant of inner/outer apply that captures the need to implement a
/ correlated-execution strategy on the physical side, where the inner
/ side is an index scan with parameters from outer side
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalIndexApply_H
#define GPOPT_CLogicalIndexApply_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalApply.h"
namespace gpopt
{
class CLogicalIndexApply : public CLogicalApply
{
private:
protected:
/ columns used from Apply's outer child used by index in Apply's inner child
CColRefArray *m_pdrgpcrOuterRefs;
/ is this an outer join?
BOOL m_fOuterJoin;
/ a copy of the original join predicate that has been pushed down to the inner side
CExpression *m_origJoinPred;
public:
CLogicalIndexApply(const CLogicalIndexApply &) = delete;
/ ctor
CLogicalIndexApply(CMemoryPool *mp, CColRefArray *pdrgpcrOuterRefs,
BOOL fOuterJoin, CExpression *origJoinPred);
/ ctor for patterns
explicit CLogicalIndexApply(CMemoryPool *mp);
/ dtor
~CLogicalIndexApply() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalIndexApply;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalIndexApply";
}
/ outer column references accessor
CColRefArray *
PdrgPcrOuterRefs() const
{
return m_pdrgpcrOuterRefs;
}
/ outer column references accessor
BOOL
FouterJoin() const
{
return m_fOuterJoin;
}
CExpression *
OrigJoinPred()
{
return m_origJoinPred;
}
/-------------------------------------------------------------------------------------
/ Derived Relational Properties
/-------------------------------------------------------------------------------------
/ derive output columns
CColRefSet *
DeriveOutputColumns(CMemoryPool *mp, CExpressionHandle &exprhdl) override
{
GPOS_ASSERT(3 == exprhdl.Arity());
return PcrsDeriveOutputCombineLogical(mp, exprhdl);
}
/ derive not nullable columns
CColRefSet *
DeriveNotNullColumns(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PcrsDeriveNotNullCombineLogical(mp, exprhdl);
}
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PpcDeriveConstraintFromPredicates(mp, exprhdl);
}
/ applicable transformations
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/ match function
BOOL Matches(COperator *pop) const override;
/-------------------------------------------------------------------------------------
/ Derived Stats
/-------------------------------------------------------------------------------------
/ derive statistics
IStatistics *PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
IStatisticsArray *stats_ctxt) const override;
/ stat promise
EStatPromise
Esp(CExpressionHandle & / exprhdl
) const override
{
return CLogical::EspMedium;
}
/ return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
/ conversion function
static CLogicalIndexApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalIndexApply == pop->Eopid());
return dynamic_cast<CLogicalIndexApply *>(pop);
}
}; / class CLogicalIndexApply
} / namespace gpopt
#endif / !GPOPT_CLogicalIndexApply_H
/ EOF
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