greenplumn CPhysicalLeftSemiHashJoin 源码
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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