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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