greenplumn CLogicalIndexApply 源码
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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