greenplumn CPhysicalLeftSemiHashJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalLeftSemiHashJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CPhysicalLeftSemiHashJoin.h
/
/ @doc:
/ Left semi hash join operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalLeftSemiHashJoin_H
#define GPOPT_CPhysicalLeftSemiHashJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysicalHashJoin.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CPhysicalLeftSemiHashJoin
/
/ @doc:
/ Left semi hash join operator
/
/---------------------------------------------------------------------------
class CPhysicalLeftSemiHashJoin : public CPhysicalHashJoin
{
private:
public:
CPhysicalLeftSemiHashJoin(const CPhysicalLeftSemiHashJoin &) = delete;
/ ctor
CPhysicalLeftSemiHashJoin(
CMemoryPool *mp, CExpressionArray *pdrgpexprOuterKeys,
CExpressionArray *pdrgpexprInnerKeys, IMdIdArray *hash_opfamilies,
CXform::EXformId origin_xform = CXform::ExfSentinel);
/ dtor
~CPhysicalLeftSemiHashJoin() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalLeftSemiHashJoin;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CPhysicalLeftSemiHashJoin";
}
/ check if required columns are included in output columns
BOOL FProvidesReqdCols(CExpressionHandle &exprhdl, CColRefSet *pcrsRequired,
ULONG ulOptReq) const override;
/ conversion function
static CPhysicalLeftSemiHashJoin *
PopConvert(COperator *pop)
{
GPOS_ASSERT(EopPhysicalLeftSemiHashJoin == pop->Eopid());
return dynamic_cast<CPhysicalLeftSemiHashJoin *>(pop);
}
}; / class CPhysicalLeftSemiHashJoin
} / namespace gpopt
#endif / !GPOPT_CPhysicalLeftSemiHashJoin_H
/ EOF
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