greenplumn CPhysicalLeftSemiNLJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalLeftSemiNLJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CPhysicalLeftSemiNLJoin.h
/
/ @doc:
/ Left semi nested-loops join operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalLeftSemiNLJoin_H
#define GPOPT_CPhysicalLeftSemiNLJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysicalNLJoin.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CPhysicalLeftSemiNLJoin
/
/ @doc:
/ Left semi nested-loops join operator
/
/---------------------------------------------------------------------------
class CPhysicalLeftSemiNLJoin : public CPhysicalNLJoin
{
private:
public:
CPhysicalLeftSemiNLJoin(const CPhysicalLeftSemiNLJoin &) = delete;
/ ctor
explicit CPhysicalLeftSemiNLJoin(CMemoryPool *mp);
/ dtor
~CPhysicalLeftSemiNLJoin() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalLeftSemiNLJoin;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CPhysicalLeftSemiNLJoin";
}
/ check if required columns are included in output columns
BOOL FProvidesReqdCols(CExpressionHandle &exprhdl, CColRefSet *pcrsRequired,
ULONG ulOptReq) const override;
/ conversion function
static CPhysicalLeftSemiNLJoin *
PopConvert(COperator *pop)
{
GPOS_ASSERT(EopPhysicalLeftSemiNLJoin == pop->Eopid());
return dynamic_cast<CPhysicalLeftSemiNLJoin *>(pop);
}
}; / class CPhysicalLeftSemiNLJoin
} / namespace gpopt
#endif / !GPOPT_CPhysicalLeftSemiNLJoin_H
/ EOF
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