greenplumn CLogicalDifference 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalDifference.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CLogicalDifference.h
/
/ @doc:
/ Logical Difference operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalDifference_H
#define GPOPT_CLogicalDifference_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalSetOp.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CLogicalDifference
/
/ @doc:
/ Difference operators
/
/---------------------------------------------------------------------------
class CLogicalDifference : public CLogicalSetOp
{
private:
public:
CLogicalDifference(const CLogicalDifference &) = delete;
/ ctor
explicit CLogicalDifference(CMemoryPool *mp);
CLogicalDifference(CMemoryPool *mp, CColRefArray *pdrgpcrOutput,
CColRef2dArray *pdrgpdrgpcrInput);
/ dtor
~CLogicalDifference() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalDifference;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalDifference";
}
/ sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return true;
}
/ return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
/-------------------------------------------------------------------------------------
/ Derived Relational Properties
/-------------------------------------------------------------------------------------
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PpcDeriveConstraintSetop(mp, exprhdl, false /*fIntersect*/);
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/-------------------------------------------------------------------------------------
/ Derived Stats
/-------------------------------------------------------------------------------------
/ stat promise
EStatPromise
Esp(CExpressionHandle &) const override
{
return CLogical::EspHigh;
}
/ derive statistics
IStatistics *PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
IStatisticsArray *stats_ctxt) const override;
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalDifference *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalDifference == pop->Eopid());
return dynamic_cast<CLogicalDifference *>(pop);
}
}; / class CLogicalDifference
} / namespace gpopt
#endif / !GPOPT_CLogicalDifference_H
/ EOF
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