greenplumn CPhysicalParallelUnionAll 源码
greenplumn CPhysicalParallelUnionAll 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalParallelUnionAll.h
// Greenplum Database
// Copyright (C) 2016 VMware, Inc. or its affiliates.
#ifndef GPOPT_CPhysicalParallelUnionAll_H
#define GPOPT_CPhysicalParallelUnionAll_H
#include "gpopt/operators/CPhysicalUnionAll.h"
namespace gpopt
{
// Operator that implements logical union all, but creates a slice for each
// child relation to maximize concurrency.
// See gpopt::CPhysicalSerialUnionAll for its serial sibling.
class CPhysicalParallelUnionAll : public CPhysicalUnionAll
{
private:
// array of child hashed distributions -- used locally for distribution derivation
CDistributionSpecArray *const m_pdrgpds;
public:
CPhysicalParallelUnionAll(CMemoryPool *mp, CColRefArray *pdrgpcrOutput,
CColRef2dArray *pdrgpdrgpcrInput);
EOperatorId Eopid() const override;
const CHAR *SzId() const override;
CDistributionSpec *PdsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CDistributionSpec *pdsRequired,
ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) const override;
CEnfdDistribution::EDistributionMatching Edm(
CReqdPropPlan *, // prppInput
ULONG, // child_index
CDrvdPropArray *, //pdrgpdpCtxt
ULONG // ulOptReq
) override;
~CPhysicalParallelUnionAll() override;
};
} // namespace gpopt
#endif //GPOPT_CPhysicalParallelUnionAll_H
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