greenplumn CConstraintNegation 源码
greenplumn CConstraintNegation 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CConstraintNegation.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CConstraintNegation.h
//
// @doc:
// Representation of a negation constraint
//---------------------------------------------------------------------------
#ifndef GPOPT_CConstraintNegation_H
#define GPOPT_CConstraintNegation_H
#include "gpos/base.h"
#include "gpopt/base/CConstraint.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CConstraintNegation
//
// @doc:
// Representation of a negation constraint
//
//---------------------------------------------------------------------------
class CConstraintNegation : public CConstraint
{
private:
// child constraint
CConstraint *m_pcnstr;
public:
CConstraintNegation(const CConstraintNegation &) = delete;
// ctor
CConstraintNegation(CMemoryPool *mp, CConstraint *pcnstr);
// dtor
~CConstraintNegation() override;
// constraint type accessor
EConstraintType
Ect() const override
{
return CConstraint::EctNegation;
}
// child constraint
CConstraint *
PcnstrChild() const
{
return m_pcnstr;
}
// is this constraint a contradiction
BOOL
FContradiction() const override
{
return m_pcnstr->IsConstraintUnbounded();
}
// is this constraint unbounded
BOOL
IsConstraintUnbounded() const override
{
return m_pcnstr->FContradiction();
}
// scalar expression
CExpression *PexprScalar(CMemoryPool *mp) override;
// check if there is a constraint on the given column
BOOL
FConstraint(const CColRef *colref) const override
{
return m_pcnstr->FConstraint(colref);
}
// return a copy of the constraint with remapped columns
CConstraint *PcnstrCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
// return constraint on a given column
CConstraint *Pcnstr(CMemoryPool *mp, const CColRef *colref) override;
// return constraint on a given column set
CConstraint *Pcnstr(CMemoryPool *mp, CColRefSet *pcrs) override;
// return a clone of the constraint for a different column
CConstraint *PcnstrRemapForColumn(CMemoryPool *mp,
CColRef *colref) const override;
// print
IOstream &OsPrint(IOstream &os) const override;
}; // class CConstraintNegation
} // namespace gpopt
#endif // !GPOPT_CConstraintNegation_H
// EOF
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