greenplumn CPhysicalSerialUnionAll 源码
greenplumn CPhysicalSerialUnionAll 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalSerialUnionAll.h
// Greenplum Database
// Copyright (C) 2016 VMware, Inc. or its affiliates.
#ifndef GPOPT_CPhysicalSerialUnionAll_H
#define GPOPT_CPhysicalSerialUnionAll_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysicalUnionAll.h"
namespace gpopt
{
// fwd declaration
class CDistributionSpecHashed;
//---------------------------------------------------------------------------
// @class:
// CPhysicalSerialUnionAll
//
// @doc:
// Physical union all operator. Executes each child serially.
//
//---------------------------------------------------------------------------
class CPhysicalSerialUnionAll : public CPhysicalUnionAll
{
private:
public:
CPhysicalSerialUnionAll(const CPhysicalSerialUnionAll &) = delete;
// ctor
CPhysicalSerialUnionAll(CMemoryPool *mp, CColRefArray *pdrgpcrOutput,
CColRef2dArray *pdrgpdrgpcrInput);
// dtor
~CPhysicalSerialUnionAll() override;
// ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalSerialUnionAll;
}
const CHAR *
SzId() const override
{
return "CPhysicalSerialUnionAll";
}
// distribution matching type
CEnfdDistribution::EDistributionMatching
Edm(CReqdPropPlan *prppInput,
ULONG, // child_index
CDrvdPropArray *, //pdrgpdpCtxt
ULONG ulOptReq) override
{
if (0 == ulOptReq && CDistributionSpec::EdtHashed ==
prppInput->Ped()->PdsRequired()->Edt())
{
// use exact matching if optimizing first request
return CEnfdDistribution::EdmExact;
}
// use relaxed matching if optimizing other requests
return CEnfdDistribution::EdmSatisfy;
}
// compute required distribution of the n-th child
CDistributionSpec *PdsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CDistributionSpec *pdsRequired,
ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) const override;
}; // class CPhysicalSerialUnionAll
} // namespace gpopt
#endif // !GPOPT_CPhysicalSerialUnionAll_H
// EOF
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