greenplumn CReqdPropRelational 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CReqdPropRelational.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 - 2011 EMC CORP.
/
/ @filename:
/ CReqdPropRelational.h
/
/ @doc:
/ Derived required relational properties
/---------------------------------------------------------------------------
#ifndef GPOPT_CReqdPropRelational_H
#define GPOPT_CReqdPropRelational_H
#include "gpos/base.h"
#include "gpopt/base/CColRef.h"
#include "gpopt/base/CReqdProp.h"
namespace gpopt
{
using namespace gpos;
/ forward declaration
class CExpression;
class CExpressionHandle;
class CColRefSet;
/---------------------------------------------------------------------------
/ @class:
/ CReqdPropRelational
/
/ @doc:
/ Required relational properties container.
/
/---------------------------------------------------------------------------
class CReqdPropRelational : public CReqdProp
{
private:
/ required stat columns
CColRefSet *m_pcrsStat{nullptr};
/ predicate on partition key
CExpression *m_pexprPartPred{nullptr};
public:
CReqdPropRelational(const CReqdPropRelational &) = delete;
/ default ctor
CReqdPropRelational();
/ ctor
explicit CReqdPropRelational(CColRefSet *pcrs);
/ ctor
CReqdPropRelational(CColRefSet *pcrs, CExpression *pexprPartPred);
/ dtor
~CReqdPropRelational() override;
/ type of properties
BOOL
FRelational() const override
{
GPOS_ASSERT(!FPlan());
return true;
}
/ stat columns accessor
CColRefSet *
PcrsStat() const
{
return m_pcrsStat;
}
/ partition predicate accessor
CExpression *
PexprPartPred() const
{
return m_pexprPartPred;
}
/ required properties computation function
void Compute(CMemoryPool *mp, CExpressionHandle &exprhdl,
CReqdProp *prpInput, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt, ULONG ulOptReq) override;
/ return difference from given properties
CReqdPropRelational *PrprelDifference(CMemoryPool *mp,
CReqdPropRelational *prprel);
/ return true if property container is empty
BOOL IsEmpty() const;
/ shorthand for conversion
static CReqdPropRelational *GetReqdRelationalProps(CReqdProp *prp);
/ print function
IOstream &OsPrint(IOstream &os) const override;
}; / class CReqdPropRelational
} / namespace gpopt
#endif / !GPOPT_CReqdPropRelational_H
/ EOF
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