greenplumn CJoinOrderMinCard 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderMinCard.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CJoinOrderMinCard.h
/
/ @doc:
/ Cardinality-based join order generation
/---------------------------------------------------------------------------
#ifndef GPOPT_CJoinOrderMinCard_H
#define GPOPT_CJoinOrderMinCard_H
#include "gpos/base.h"
#include "gpos/common/CBitSet.h"
#include "gpos/common/CRefCount.h"
#include "gpos/io/IOstream.h"
#include "gpopt/xforms/CJoinOrder.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CJoinOrderMinCard
/
/ @doc:
/ Helper class for creating join orders based on cardinality of results
/
/---------------------------------------------------------------------------
class CJoinOrderMinCard : public CJoinOrder
{
private:
/ result component
SComponent *m_pcompResult;
public:
/ ctor
CJoinOrderMinCard(CMemoryPool *mp, CExpressionArray *pdrgpexprComponents,
CExpressionArray *pdrgpexprConjuncts);
/ dtor
~CJoinOrderMinCard() override;
/ main handler
virtual CExpression *PexprExpand();
/ print function
IOstream &OsPrint(IOstream &) const;
CXform::EXformId
EOriginXForm() const override
{
return CXform::ExfExpandNAryJoinMinCard;
}
}; / class CJoinOrderMinCard
} / namespace gpopt
#endif / !GPOPT_CJoinOrderMinCard_H
/ EOF
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