greenplumn CPhysicalLeftOuterHashJoin 源码
greenplumn CPhysicalLeftOuterHashJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalLeftOuterHashJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CPhysicalLeftOuterHashJoin.h
//
// @doc:
// Left outer hash join operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalLeftOuterHashJoin_H
#define GPOPT_CPhysicalLeftOuterHashJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysicalHashJoin.h"
namespace gpopt
{
//---------------------------------------------------------------------------
// @class:
// CPhysicalLeftOuterHashJoin
//
// @doc:
// Left outer hash join operator
//
//---------------------------------------------------------------------------
class CPhysicalLeftOuterHashJoin : public CPhysicalHashJoin
{
private:
// helper for deriving hash join distribution from hashed children
CDistributionSpec *PdsDeriveFromHashedChildren(
CMemoryPool *mp, CDistributionSpec *pdsOuter,
CDistributionSpec *pdsInner) const;
public:
CPhysicalLeftOuterHashJoin(const CPhysicalLeftOuterHashJoin &) = delete;
// ctor
CPhysicalLeftOuterHashJoin(
CMemoryPool *mp, CExpressionArray *pdrgpexprOuterKeys,
CExpressionArray *pdrgpexprInnerKeys, IMdIdArray *hash_opfamilies,
CXform::EXformId origin_xform = CXform::ExfSentinel);
// dtor
~CPhysicalLeftOuterHashJoin() override;
// ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalLeftOuterHashJoin;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CPhysicalLeftOuterHashJoin";
}
// derive distribution
CDistributionSpec *PdsDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
// conversion function
static CPhysicalLeftOuterHashJoin *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopPhysicalLeftOuterHashJoin == pop->Eopid());
return dynamic_cast<CPhysicalLeftOuterHashJoin *>(pop);
}
}; // class CPhysicalLeftOuterHashJoin
} // namespace gpopt
#endif // !GPOPT_CPhysicalLeftOuterHashJoin_H
// EOF
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