greenplumn CConstraintDisjunction 源码
greenplumn CConstraintDisjunction 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CConstraintDisjunction.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CConstraintDisjunction.h
//
// @doc:
// Representation of a disjunction constraint. A disjunction is a number
// of ORed constraints
//---------------------------------------------------------------------------
#ifndef GPOPT_CConstraintDisjunction_H
#define GPOPT_CConstraintDisjunction_H
#include "gpos/base.h"
#include "gpopt/base/CConstraint.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CConstraintDisjunction
//
// @doc:
// Representation of a disjunction constraint
//
//---------------------------------------------------------------------------
class CConstraintDisjunction : public CConstraint
{
private:
// array of constraints
CConstraintArray *m_pdrgpcnstr;
// mapping colref -> array of child constraints
ColRefToConstraintArrayMap *m_phmcolconstr;
public:
CConstraintDisjunction(const CConstraintDisjunction &) = delete;
// ctor
CConstraintDisjunction(CMemoryPool *mp, CConstraintArray *pdrgpcnstr);
// dtor
~CConstraintDisjunction() override;
// constraint type accessor
EConstraintType
Ect() const override
{
return CConstraint::EctDisjunction;
}
// all constraints in disjunction
CConstraintArray *
Pdrgpcnstr() const
{
return m_pdrgpcnstr;
}
// is this constraint a contradiction
BOOL FContradiction() const override;
// return a copy of the constraint with remapped columns
CConstraint *PcnstrCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
// 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 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
{
return PrintConjunctionDisjunction(os, m_pdrgpcnstr);
}
}; // class CConstraintDisjunction
} // namespace gpopt
#endif // !GPOPT_CConstraintDisjunction_H
// EOF
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