yjhjstz commented on code in PR #1398: URL: https://github.com/apache/cloudberry/pull/1398#discussion_r2448764672
########## src/backend/gporca/libgpopt/src/operators/CPhysicalParallelTableScan.cpp: ########## @@ -0,0 +1,284 @@ +/*------------------------------------------------------------------------- + * + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + * + * CPhysicalParallelTableScan.cpp + * + * IDENTIFICATION + * src/backend/gporca/libgpopt/src/operators/CPhysicalParallelTableScan.cpp + * + *------------------------------------------------------------------------- + */ + +#include "gpopt/operators/CPhysicalParallelTableScan.h" + +#include "gpos/base.h" + +#include "gpopt/base/CDistributionSpec.h" +#include "gpopt/base/CDistributionSpecHashed.h" +#include "gpopt/base/CDistributionSpecRandom.h" +#include "gpopt/base/CDistributionSpecWorkerRandom.h" +#include "gpopt/base/CDistributionSpecSingleton.h" +#include "gpopt/base/CUtils.h" +#include "gpopt/base/CEnfdDistribution.h" +#include "gpopt/base/CEnfdRewindability.h" +#include "gpopt/base/COptimizationContext.h" +#include "gpopt/base/CRewindabilitySpec.h" +#include "gpopt/base/CDrvdPropPlan.h" +#include "gpopt/metadata/CName.h" +#include "gpopt/metadata/CTableDescriptor.h" +#include "gpopt/operators/CExpressionHandle.h" + +using namespace gpopt; + +//--------------------------------------------------------------------------- +// @function: +// CPhysicalParallelTableScan::CPhysicalParallelTableScan +// +// @doc: +// ctor +// +//--------------------------------------------------------------------------- +CPhysicalParallelTableScan::CPhysicalParallelTableScan(CMemoryPool *mp) + : CPhysicalTableScan(mp, GPOS_NEW(mp) CName(GPOS_NEW(mp) CWStringConst(GPOS_WSZ_LIT("parallel_table"))), nullptr, nullptr), + m_ulParallelWorkers(1), + m_pdsWorkerDistribution(nullptr) +{ +} + +//--------------------------------------------------------------------------- +// @function: +// CPhysicalParallelTableScan::CPhysicalParallelTableScan +// +// @doc: +// ctor +// +//--------------------------------------------------------------------------- +CPhysicalParallelTableScan::CPhysicalParallelTableScan(CMemoryPool *mp, + const CName *pnameAlias, + CTableDescriptor *ptabdesc, + CColRefArray *pdrgpcrOutput, + ULONG ulParallelWorkers) + : CPhysicalTableScan(mp, pnameAlias, ptabdesc, pdrgpcrOutput), + m_ulParallelWorkers(ulParallelWorkers), + m_pdsWorkerDistribution(nullptr) +{ + GPOS_ASSERT(ulParallelWorkers > 0); + GPOS_ASSERT(nullptr != m_pds); + // Create worker-level distribution based on table's segment distribution + if (ulParallelWorkers > 0 && nullptr != m_pds) + { + // Create worker-level random distribution using the table's distribution as base + // The base CPhysicalScan already sets up m_pds from the table descriptor + m_pdsWorkerDistribution = CDistributionSpecWorkerRandom::PdsCreateWorkerRandom(mp, ulParallelWorkers, m_pds); + } +} + +//--------------------------------------------------------------------------- +// @function: +// CPhysicalParallelTableScan::~CPhysicalParallelTableScan +// +// @doc: +// dtor +// +//--------------------------------------------------------------------------- +CPhysicalParallelTableScan::~CPhysicalParallelTableScan() +{ + CRefCount::SafeRelease(m_pdsWorkerDistribution); +} + +//--------------------------------------------------------------------------- +// @function: +// CPhysicalParallelTableScan::HashValue +// +// @doc: +// Combine pointer for table descriptor, parallel workers and Eop +// +//--------------------------------------------------------------------------- +ULONG +CPhysicalParallelTableScan::HashValue() const +{ + ULONG ulHash = gpos::CombineHashes(CPhysicalTableScan::HashValue(), + gpos::HashValue<ULONG>(&m_ulParallelWorkers)); + return ulHash; +} + +//--------------------------------------------------------------------------- +// @function: +// CPhysicalParallelTableScan::Matches +// +// @doc: +// match operator +// +//--------------------------------------------------------------------------- +BOOL +CPhysicalParallelTableScan::Matches(COperator *pop) const +{ + if (Eopid() != pop->Eopid()) + { + return false; + } + + CPhysicalParallelTableScan *popParallelTableScan = + CPhysicalParallelTableScan::PopConvert(pop); + + return CPhysicalTableScan::Matches(pop) && + m_ulParallelWorkers == popParallelTableScan->UlParallelWorkers(); +} + +//--------------------------------------------------------------------------- +// @function: +// CPhysicalParallelTableScan::OsPrint +// +// @doc: +// debug print +// +//--------------------------------------------------------------------------- +IOstream & +CPhysicalParallelTableScan::OsPrint(IOstream &os) const +{ + os << SzId() << " "; + + // alias of table as referenced in the query + m_pnameAlias->OsPrint(os); + + // actual name of table in catalog and columns + os << " ("; + m_ptabdesc->Name().OsPrint(os); + os << "), Columns: ["; + + CUtils::OsPrintDrgPcr(os, m_pdrgpcrOutput); + os << "], Workers: " << m_ulParallelWorkers; + + return os; +} + + +//--------------------------------------------------------------------------- +// @function: +// CPhysicalParallelTableScan::PdsDerive +// +// @doc: +// Derive distribution for parallel table scan +// +//--------------------------------------------------------------------------- +CDistributionSpec * +CPhysicalParallelTableScan::PdsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl) const +{ + // If we have a pre-computed worker distribution, use it + if (nullptr != m_pdsWorkerDistribution) + { + m_pdsWorkerDistribution->AddRef(); + return m_pdsWorkerDistribution; + } + + // Otherwise, derive from the base physical scan + // This uses the m_pds member from CPhysicalScan + return CPhysicalScan::PdsDerive(mp, exprhdl); Review Comment: will not happen -- This is an automated message from the Apache Git Service. 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