greenplumn CPropConstraint 源码
greenplumn CPropConstraint 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CPropConstraint.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CPropConstraint.h
//
// @doc:
// Representation of constraint property
//---------------------------------------------------------------------------
#ifndef GPOPT_CPropConstraint_H
#define GPOPT_CPropConstraint_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "gpopt/base/CColRefSet.h"
#include "gpopt/base/CConstraint.h"
namespace gpopt
{
using namespace gpos;
// forward declaration
class CConstraint;
class CExpression;
//---------------------------------------------------------------------------
// @class:
// CPropConstraint
//
// @doc:
// Representation of constraint property
//
//---------------------------------------------------------------------------
class CPropConstraint : public CRefCount, public DbgPrintMixin<CPropConstraint>
{
private:
// array of equivalence classes
CColRefSetArray *m_pdrgpcrs;
// mapping from column to equivalence class
ColRefToColRefSetMap *m_phmcrcrs;
// constraint
CConstraint *m_pcnstr;
// initialize mapping from columns to equivalence classes
void InitHashMap(CMemoryPool *mp);
public:
CPropConstraint(const CPropConstraint &) = delete;
// ctor
CPropConstraint(CMemoryPool *mp, CColRefSetArray *pdrgpcrs,
CConstraint *pcnstr);
// dtor
~CPropConstraint() override;
// equivalence classes
CColRefSetArray *
PdrgpcrsEquivClasses() const
{
return m_pdrgpcrs;
}
// mapping
CColRefSet *
PcrsEquivClass(const CColRef *colref) const
{
if (nullptr == m_phmcrcrs)
{
return nullptr;
}
return m_phmcrcrs->Find(colref);
}
// constraint
CConstraint *
Pcnstr() const
{
return m_pcnstr;
}
// is this a contradiction
BOOL FContradiction() const;
// scalar expression on given column mapped from all constraints
// on its equivalent columns
CExpression *PexprScalarMappedFromEquivCols(
CMemoryPool *mp, CColRef *colref,
CPropConstraint *constraintsForOuterRefs) const;
// print
IOstream &OsPrint(IOstream &os) const;
}; // class CPropConstraint
// shorthand for printing
inline IOstream &
operator<<(IOstream &os, CPropConstraint &pc)
{
return pc.OsPrint(os);
}
} // namespace gpopt
#endif // !GPOPT_CPropConstraint_H
// EOF
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