greenplumn CLogicalLeftOuterApply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalLeftOuterApply.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright 2012 EMC Corp.
/
/ @filename:
/ CLogicalLeftOuterApply.h
/
/ @doc:
/ Logical Left Outer Apply operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalLeftOuterApply_H
#define GPOPT_CLogicalLeftOuterApply_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalApply.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CLogicalLeftOuterApply
/
/ @doc:
/ Logical left outer Apply operator used in subquery transformations
/
/---------------------------------------------------------------------------
class CLogicalLeftOuterApply : public CLogicalApply
{
private:
public:
CLogicalLeftOuterApply(const CLogicalLeftOuterApply &) = delete;
/ ctor for patterns
explicit CLogicalLeftOuterApply(CMemoryPool *mp);
/ ctor
CLogicalLeftOuterApply(CMemoryPool *mp, CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq);
/ dtor
~CLogicalLeftOuterApply() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalLeftOuterApply;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalLeftOuterApply";
}
/ return true if we can pull projections up past this operator from its given child
BOOL
FCanPullProjectionsUp(ULONG child_index) const override
{
return (0 == child_index);
}
/ return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
/-------------------------------------------------------------------------------------
/ 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 output columns
CColRefSet *
DeriveNotNullColumns(CMemoryPool *, / mp
CExpressionHandle &exprhdl) const override
{
/ left outer apply passes through not null columns from outer child only
return PcrsDeriveNotNullPassThruOuter(exprhdl);
}
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *, /mp,
CExpressionHandle &exprhdl) const override
{
return PpcDeriveConstraintPassThru(exprhdl, 0 /*ulChild*/);
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *) const override;
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalLeftOuterApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalLeftOuterApply == pop->Eopid());
return dynamic_cast<CLogicalLeftOuterApply *>(pop);
}
}; / class CLogicalLeftOuterApply
} / namespace gpopt
#endif / !GPOPT_CLogicalLeftOuterApply_H
/ EOF
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