greenplumn CPropSpec 源码
greenplumn CPropSpec 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CPropSpec.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CPropSpec.h
//
// @doc:
// Abstraction for specification of properties;
//---------------------------------------------------------------------------
#ifndef GPOPT_CPropSpec_H
#define GPOPT_CPropSpec_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "gpopt/operators/CExpression.h"
namespace gpopt
{
using namespace gpos;
// prototypes
class CReqdPropPlan;
//---------------------------------------------------------------------------
// @class:
// CPropSpec
//
// @doc:
// Property specification
//
//---------------------------------------------------------------------------
class CPropSpec : public CRefCount, public DbgPrintMixin<CPropSpec>
{
public:
// property type
enum EPropSpecType
{
EpstOrder,
EpstDistribution,
EpstRewindability,
EpstPartPropagation,
EpstSentinel
};
private:
protected:
// ctor
CPropSpec() = default;
// dtor
~CPropSpec() override = default;
public:
CPropSpec(const CPropSpec &) = delete;
// append enforcers to dynamic array for the given plan properties
virtual void AppendEnforcers(CMemoryPool *mp, CExpressionHandle &exprhdl,
CReqdPropPlan *prpp,
CExpressionArray *pdrgpexpr,
CExpression *pexpr) = 0;
// hash function
virtual ULONG HashValue() const = 0;
// extract columns used by the property
virtual CColRefSet *PcrsUsed(CMemoryPool *mp) const = 0;
// property type
virtual EPropSpecType Epst() const = 0;
virtual gpos::IOstream &OsPrint(gpos::IOstream &os) const = 0;
}; // class CPropSpec
// shorthand for printing
inline IOstream &
operator<<(IOstream &os, const CPropSpec &ospec)
{
return ospec.OsPrint(os);
}
} // namespace gpopt
FORCE_GENERATE_DBGSTR(gpopt::CPropSpec);
#endif // !GPOPT_CPropSpec_H
// EOF
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