greenplumn CPhysical 源码
greenplumn CPhysical 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CPhysical.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CPhysical.cpp
//
// @doc:
// Implementation of basic physical operator
//---------------------------------------------------------------------------
#include "gpopt/operators/CPhysical.h"
#include <cwchar>
#include "gpos/base.h"
#include "gpopt/base/CCTEMap.h"
#include "gpopt/base/CCTEReq.h"
#include "gpopt/base/CDistributionSpecAny.h"
#include "gpopt/base/CDistributionSpecHashed.h"
#include "gpopt/base/CDistributionSpecRandom.h"
#include "gpopt/base/CDistributionSpecReplicated.h"
#include "gpopt/base/CDistributionSpecSingleton.h"
#include "gpopt/base/CDrvdPropPlan.h"
#include "gpopt/base/CReqdPropPlan.h"
#include "gpopt/operators/CExpression.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CScalarIdent.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CPhysical::CPhysical
//
// @doc:
// ctor
//
//---------------------------------------------------------------------------
CPhysical::CPhysical(CMemoryPool *mp)
: COperator(mp),
m_phmrcr(nullptr),
m_pdrgpulpOptReqsExpanded(nullptr),
m_ulTotalOptRequests(
1) // by default, an operator creates a single request for each property
{
GPOS_ASSERT(nullptr != mp);
for (ULONG ul = 0; ul < GPOPT_PLAN_PROPS; ul++)
{
// by default, an operator creates a single request for each property
m_rgulOptReqs[ul] = 1;
}
UpdateOptRequests(0 /*ulPropIndex*/, 1 /*ulOrderReqs*/);
m_phmrcr = GPOS_NEW(mp) ReqdColsReqToColRefSetMap(mp);
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::UpdateOptRequests
//
// @doc:
// Update number of requests of a given property,
// re-compute total number of optimization requests as the product
// of all properties requests
//
//---------------------------------------------------------------------------
void
CPhysical::UpdateOptRequests(ULONG ulPropIndex, ULONG ulRequests)
{
GPOS_ASSERT(ulPropIndex < GPOPT_PLAN_PROPS);
// update property requests
m_rgulOptReqs[ulPropIndex] = ulRequests;
// compute new value of total requests
ULONG ulOptReqs = 1;
for (ULONG ul = 0; ul < GPOPT_PLAN_PROPS; ul++)
{
ulOptReqs = ulOptReqs * m_rgulOptReqs[ul];
}
// update total requests
m_ulTotalOptRequests = ulOptReqs;
// update expanded requests
const ULONG ulOrderRequests = UlOrderRequests();
const ULONG ulDistrRequests = UlDistrRequests();
const ULONG ulRewindRequests = UlRewindRequests();
const ULONG ulPartPropagateRequests = UlPartPropagateRequests();
CRefCount::SafeRelease(m_pdrgpulpOptReqsExpanded);
m_pdrgpulpOptReqsExpanded = nullptr;
m_pdrgpulpOptReqsExpanded = GPOS_NEW(m_mp) UlongPtrArray(m_mp);
for (ULONG ulOrder = 0; ulOrder < ulOrderRequests; ulOrder++)
{
for (ULONG ulDistr = 0; ulDistr < ulDistrRequests; ulDistr++)
{
for (ULONG ulRewind = 0; ulRewind < ulRewindRequests; ulRewind++)
{
for (ULONG ulPartPropagate = 0;
ulPartPropagate < ulPartPropagateRequests;
ulPartPropagate++)
{
ULONG_PTR *pulpRequest =
GPOS_NEW_ARRAY(m_mp, ULONG_PTR, GPOPT_PLAN_PROPS);
pulpRequest[0] = ulOrder;
pulpRequest[1] = ulDistr;
pulpRequest[2] = ulRewind;
pulpRequest[3] = ulPartPropagate;
m_pdrgpulpOptReqsExpanded->Append(pulpRequest);
}
}
}
}
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::LookupReqNo
//
// @doc:
// Map input request number to order, distribution, rewindability and
// partition propagation requests
//
//---------------------------------------------------------------------------
void
CPhysical::LookupRequest(
ULONG ulReqNo, // input: request number
ULONG *pulOrderReq, // output: order request number
ULONG *pulDistrReq, // output: distribution request number
ULONG *pulRewindReq, // output: rewindability request number
ULONG *pulPartPropagateReq // output: partition propagation request number
)
{
GPOS_ASSERT(nullptr != m_pdrgpulpOptReqsExpanded);
GPOS_ASSERT(ulReqNo < m_pdrgpulpOptReqsExpanded->Size());
GPOS_ASSERT(nullptr != pulOrderReq);
GPOS_ASSERT(nullptr != pulDistrReq);
GPOS_ASSERT(nullptr != pulRewindReq);
GPOS_ASSERT(nullptr != pulPartPropagateReq);
ULONG_PTR *pulpRequest = (*m_pdrgpulpOptReqsExpanded)[ulReqNo];
*pulOrderReq = (ULONG) pulpRequest[0];
*pulDistrReq = (ULONG) pulpRequest[1];
*pulRewindReq = (ULONG) pulpRequest[2];
*pulPartPropagateReq = (ULONG) pulpRequest[3];
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PdpCreate
//
// @doc:
// Create base container of derived properties
//
//---------------------------------------------------------------------------
CDrvdProp *
CPhysical::PdpCreate(CMemoryPool *mp) const
{
return GPOS_NEW(mp) CDrvdPropPlan();
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PopCopyWithRemappedColumns
//
// @doc:
// Return a copy of the operator with remapped columns
//
//---------------------------------------------------------------------------
COperator *
CPhysical::PopCopyWithRemappedColumns(CMemoryPool *, //mp,
UlongToColRefMap *, //colref_mapping,
BOOL //must_exist
)
{
GPOS_ASSERT(!"Invalid call of CPhysical::PopCopyWithRemappedColumns");
return nullptr;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PrpCreate
//
// @doc:
// Create base container of required properties
//
//---------------------------------------------------------------------------
CReqdProp *
CPhysical::PrpCreate(CMemoryPool *mp) const
{
return GPOS_NEW(mp) CReqdPropPlan();
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalHashJoin::CReqdColsRequest::HashValue
//
// @doc:
// Hash function
//
//---------------------------------------------------------------------------
ULONG
CPhysical::CReqdColsRequest::HashValue(const CReqdColsRequest *prcr)
{
GPOS_ASSERT(nullptr != prcr);
ULONG ulHash = prcr->GetColRefSet()->HashValue();
ulHash = CombineHashes(ulHash, prcr->UlChildIndex());
;
return CombineHashes(ulHash, prcr->UlScalarChildIndex());
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalHashJoin::CReqdColsRequest::Equals
//
// @doc:
// Equality function
//
//---------------------------------------------------------------------------
BOOL
CPhysical::CReqdColsRequest::Equals(const CReqdColsRequest *prcrFst,
const CReqdColsRequest *prcrSnd)
{
GPOS_ASSERT(nullptr != prcrFst);
GPOS_ASSERT(nullptr != prcrSnd);
return prcrFst->UlChildIndex() == prcrSnd->UlChildIndex() &&
prcrFst->UlScalarChildIndex() == prcrSnd->UlScalarChildIndex() &&
prcrFst->GetColRefSet()->Equals(prcrSnd->GetColRefSet());
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PdsCompute
//
// @doc:
// Compute the distribution spec given the table descriptor
//
//---------------------------------------------------------------------------
CDistributionSpec *
CPhysical::PdsCompute(CMemoryPool *mp, const CTableDescriptor *ptabdesc,
CColRefArray *pdrgpcrOutput, CColRef *pcr_segment_id)
{
CDistributionSpec *pds = nullptr;
switch (ptabdesc->GetRelDistribution())
{
case IMDRelation::EreldistrMasterOnly:
pds = GPOS_NEW(mp) CDistributionSpecSingleton(
CDistributionSpecSingleton::EstMaster);
break;
case IMDRelation::EreldistrRandom:
{
// We calculate gp_segment_id directly through ptabdesc by
// finding the column Attno that matches the string in question
if (pcr_segment_id == nullptr)
{
for (ULONG i = 0; i < pdrgpcrOutput->Size(); i++)
{
if (wcscmp((*pdrgpcrOutput)[i]->Name().Pstr()->GetBuffer(),
L"gp_segment_id") == 0)
{
pcr_segment_id = (*pdrgpcrOutput)[i];
}
}
}
pds = GPOS_NEW(mp) CDistributionSpecRandom(pcr_segment_id);
break;
}
case IMDRelation::EreldistrHash:
{
const CColumnDescriptorArray *pdrgpcoldesc =
ptabdesc->PdrgpcoldescDist();
CColRefArray *colref_array = GPOS_NEW(mp) CColRefArray(mp);
const ULONG size = pdrgpcoldesc->Size();
for (ULONG ul = 0; ul < size; ul++)
{
CColumnDescriptor *pcoldesc = (*pdrgpcoldesc)[ul];
ULONG ulPos = gpopt::CTableDescriptor::UlPos(
pcoldesc, ptabdesc->Pdrgpcoldesc());
GPOS_ASSERT(ulPos < ptabdesc->Pdrgpcoldesc()->Size() &&
"Column not found");
CColRef *colref = (*pdrgpcrOutput)[ulPos];
colref_array->Append(colref);
}
CExpressionArray *pdrgpexpr =
CUtils::PdrgpexprScalarIdents(mp, colref_array);
colref_array->Release();
IMdIdArray *opfamilies = nullptr;
if (GPOS_FTRACE(EopttraceConsiderOpfamiliesForDistribution))
{
opfamilies = GPOS_NEW(mp) IMdIdArray(mp);
for (ULONG ul = 0; ul < size; ul++)
{
IMDId *opfamily = (*ptabdesc->DistrOpfamilies())[ul];
GPOS_ASSERT(nullptr != opfamily && opfamily->IsValid());
opfamily->AddRef();
opfamilies->Append(opfamily);
}
GPOS_ASSERT(opfamilies->Size() == pdrgpexpr->Size());
}
pds = GPOS_NEW(mp) CDistributionSpecHashed(
pdrgpexpr, true /*fNullsColocated*/, opfamilies);
break;
}
case IMDRelation::EreldistrReplicated:
return GPOS_NEW(mp) CDistributionSpecReplicated(
CDistributionSpec::EdtStrictReplicated);
break;
default:
GPOS_ASSERT(!"Invalid distribution policy");
}
return pds;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PosPassThru
//
// @doc:
// Helper for a simple case of of computing child's required sort order
//
//---------------------------------------------------------------------------
COrderSpec *
CPhysical::PosPassThru(CMemoryPool *, // mp
CExpressionHandle &, // exprhdl
COrderSpec *posRequired,
ULONG // child_index
)
{
posRequired->AddRef();
return posRequired;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PdsPassThru
//
// @doc:
// Helper for a simple case of computing child's required distribution
//
//---------------------------------------------------------------------------
CDistributionSpec *
CPhysical::PdsPassThru(CMemoryPool *, // mp
CExpressionHandle &, // exprhdl
CDistributionSpec *pdsRequired,
ULONG // child_index
)
{
pdsRequired->AddRef();
return pdsRequired;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PdsSingletonExecutionOrReplicated
//
// @doc:
// Helper for computing child's required distribution - Singleton or Replicated
// 1. If the expression must execute on single host - require Singleton
// 2. If the expression has outer references - require Singleton or Replicated
// based on the optimization request
//
//---------------------------------------------------------------------------
CDistributionSpec *
CPhysical::PdsRequireSingletonOrReplicated(CMemoryPool *mp,
CExpressionHandle &exprhdl,
CDistributionSpec *pdsRequired,
ULONG child_index, ULONG ulOptReq)
{
GPOS_ASSERT(2 > ulOptReq);
// if expression has to execute on a single host then we need a gather motion
if (exprhdl.NeedsSingletonExecution())
{
return PdsRequireSingleton(mp, exprhdl, pdsRequired, child_index);
}
// if there are outer references, then we need a broadcast (or a gather)
if (exprhdl.HasOuterRefs())
{
if (0 == ulOptReq)
{
return GPOS_NEW(mp)
CDistributionSpecReplicated(CDistributionSpec::EdtReplicated);
}
return GPOS_NEW(mp) CDistributionSpecSingleton();
}
return nullptr;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PdsUnary
//
// @doc:
// Helper for computing child's required distribution in unary operators
// with a scalar child
//
//---------------------------------------------------------------------------
CDistributionSpec *
CPhysical::PdsUnary(CMemoryPool *mp, CExpressionHandle &exprhdl,
CDistributionSpec *pdsRequired, ULONG child_index,
ULONG ulOptReq)
{
GPOS_ASSERT(0 == child_index);
GPOS_ASSERT(2 > ulOptReq);
// check if singleton/replicated distribution needs to be requested
CDistributionSpec *pds = PdsRequireSingletonOrReplicated(
mp, exprhdl, pdsRequired, child_index, ulOptReq);
if (nullptr != pds)
{
return pds;
}
// operator does not have distribution requirements, required distribution
// will be enforced on its output
return GPOS_NEW(mp) CDistributionSpecAny(exprhdl.Pop()->Eopid());
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PrsPassThru
//
// @doc:
// Helper for a simple case of of computing child's required rewindability
//
//---------------------------------------------------------------------------
CRewindabilitySpec *
CPhysical::PrsPassThru(CMemoryPool *, // mp
CExpressionHandle &, // exprhdl
CRewindabilitySpec *prsRequired,
ULONG // child_index
)
{
prsRequired->AddRef();
return prsRequired;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PosDerivePassThruOuter
//
// @doc:
// Helper for common case of sort order derivation
//
//---------------------------------------------------------------------------
COrderSpec *
CPhysical::PosDerivePassThruOuter(CExpressionHandle &exprhdl)
{
COrderSpec *pos = exprhdl.Pdpplan(0 /*child_index*/)->Pos();
pos->AddRef();
return pos;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PdsDerivePassThruOuter
//
// @doc:
// Helper for common case of distribution derivation
//
//---------------------------------------------------------------------------
CDistributionSpec *
CPhysical::PdsDerivePassThruOuter(CExpressionHandle &exprhdl)
{
CDistributionSpec *pds = exprhdl.Pdpplan(0 /*child_index*/)->Pds();
pds->AddRef();
return pds;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PrsDerivePassThruOuter
//
// @doc:
// Helper for common case of rewindability derivation
//
//---------------------------------------------------------------------------
CRewindabilitySpec *
CPhysical::PrsDerivePassThruOuter(CMemoryPool *mp, CExpressionHandle &exprhdl)
{
CRewindabilitySpec *prs = exprhdl.Pdpplan(0 /*child_index*/)->Prs();
// I cannot derive mark-restorable just because my child is mark-restorable.
// However, I am rewindable.
if (CRewindabilitySpec::ErtMarkRestore == prs->Ert())
{
prs = GPOS_NEW(mp)
CRewindabilitySpec(CRewindabilitySpec::ErtRewindable, prs->Emht());
}
else
{
prs->AddRef();
}
return prs;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PcrsChildReqd
//
// @doc:
// Helper for computing required output columns of the n-th child;
// the caller must be an operator whose ulScalarIndex-th child is a
// scalar
//
//---------------------------------------------------------------------------
CColRefSet *
CPhysical::PcrsChildReqd(CMemoryPool *mp, CExpressionHandle &exprhdl,
CColRefSet *pcrsRequired, ULONG child_index,
ULONG ulScalarIndex)
{
pcrsRequired->AddRef();
CReqdColsRequest *prcr =
GPOS_NEW(mp) CReqdColsRequest(pcrsRequired, child_index, ulScalarIndex);
CColRefSet *pcrs = nullptr;
// lookup required columns map first
pcrs = m_phmrcr->Find(prcr);
if (nullptr != pcrs)
{
prcr->Release();
pcrs->AddRef();
return pcrs;
}
// request was not found in map -- we need to compute it
pcrs = GPOS_NEW(mp) CColRefSet(mp, *pcrsRequired);
if (gpos::ulong_max != ulScalarIndex)
{
// include used columns and exclude defined columns of scalar child
pcrs->Union(exprhdl.DeriveUsedColumns(ulScalarIndex));
pcrs->Exclude(exprhdl.DeriveDefinedColumns(ulScalarIndex));
}
// intersect computed column set with child's output columns
pcrs->Intersection(exprhdl.DeriveOutputColumns(child_index));
// insert request in map
pcrs->AddRef();
BOOL fSuccess GPOS_ASSERTS_ONLY = m_phmrcr->Insert(prcr, pcrs);
GPOS_ASSERT(fSuccess);
return pcrs;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::FUnaryProvidesReqdCols
//
// @doc:
// Helper for checking if output columns of a unary operator that defines
// no new columns include the required columns
//
//---------------------------------------------------------------------------
BOOL
CPhysical::FUnaryProvidesReqdCols(CExpressionHandle &exprhdl,
CColRefSet *pcrsRequired)
{
GPOS_ASSERT(nullptr != pcrsRequired);
CColRefSet *pcrsOutput = exprhdl.DeriveOutputColumns(0 /*child_index*/);
return pcrsOutput->ContainsAll(pcrsRequired);
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PdssMatching
//
// @doc:
// Compute a singleton distribution matching the given distribution
//
//---------------------------------------------------------------------------
CDistributionSpecSingleton *
CPhysical::PdssMatching(CMemoryPool *mp, CDistributionSpecSingleton *pdss)
{
CDistributionSpecSingleton::ESegmentType est =
CDistributionSpecSingleton::EstSegment;
if (pdss->FOnMaster())
{
est = CDistributionSpecSingleton::EstMaster;
}
return GPOS_NEW(mp) CDistributionSpecSingleton(est);
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PcterPushThru
//
// @doc:
// Helper for pushing cte requirement to the child
//
//---------------------------------------------------------------------------
CCTEReq *
CPhysical::PcterPushThru(CCTEReq *pcter)
{
GPOS_ASSERT(nullptr != pcter);
pcter->AddRef();
return pcter;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PcmCombine
//
// @doc:
// Combine the derived CTE maps of the first n children
// of the given expression handle
//
//---------------------------------------------------------------------------
CCTEMap *
CPhysical::PcmCombine(CMemoryPool *mp, CDrvdPropArray *pdrgpdpCtxt)
{
GPOS_ASSERT(nullptr != pdrgpdpCtxt);
const ULONG size = pdrgpdpCtxt->Size();
CCTEMap *pcmCombined = GPOS_NEW(mp) CCTEMap(mp);
for (ULONG ul = 0; ul < size; ul++)
{
CCTEMap *pcmChild =
CDrvdPropPlan::Pdpplan((*pdrgpdpCtxt)[ul])->GetCostModel();
// get the remaining requirements that have not been met by child
CCTEMap *pcm = CCTEMap::PcmCombine(mp, *pcmCombined, *pcmChild);
pcmCombined->Release();
pcmCombined = pcm;
}
return pcmCombined;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PcterNAry
//
// @doc:
// Helper for computing cte requirement for the n-th child
//
//---------------------------------------------------------------------------
CCTEReq *
CPhysical::PcterNAry(CMemoryPool *mp, CExpressionHandle &exprhdl,
CCTEReq *pcter, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt) const
{
GPOS_ASSERT(nullptr != pcter);
if (EceoLeftToRight == Eceo())
{
ULONG ulLastNonScalarChild = exprhdl.UlLastNonScalarChild();
if (gpos::ulong_max != ulLastNonScalarChild &&
child_index < ulLastNonScalarChild)
{
return pcter->PcterAllOptional(mp);
}
}
else
{
GPOS_ASSERT(EceoRightToLeft == Eceo());
ULONG ulFirstNonScalarChild = exprhdl.UlFirstNonScalarChild();
if (gpos::ulong_max != ulFirstNonScalarChild &&
child_index > ulFirstNonScalarChild)
{
return pcter->PcterAllOptional(mp);
}
}
CCTEMap *pcmCombined = PcmCombine(mp, pdrgpdpCtxt);
// pass the remaining requirements that have not been resolved
CCTEReq *pcterUnresolved = pcter->PcterUnresolved(mp, pcmCombined);
pcmCombined->Release();
return pcterUnresolved;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::FCanPushPartReqToChild
//
// @doc:
// Check whether we can push a part table requirement to a given child, given
// the knowledge of where the part index id is defined
//
//---------------------------------------------------------------------------
BOOL
CPhysical::FCanPushPartReqToChild(CBitSet *pbsPartConsumer, ULONG child_index)
{
GPOS_ASSERT(nullptr != pbsPartConsumer);
// if part index id comes from more that one child, we cannot push request to just one child
if (1 < pbsPartConsumer->Size())
{
return false;
}
// child where the part index is defined should be the same child being processed
return (pbsPartConsumer->Get(child_index));
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::PcmDerive
//
// @doc:
// Common case of combining cte maps of all logical children
//
//---------------------------------------------------------------------------
CCTEMap *
CPhysical::PcmDerive(CMemoryPool *mp, CExpressionHandle &exprhdl) const
{
GPOS_ASSERT(0 < exprhdl.Arity());
CCTEMap *pcm = GPOS_NEW(mp) CCTEMap(mp);
const ULONG arity = exprhdl.Arity();
for (ULONG ul = 0; ul < arity; ul++)
{
if (!exprhdl.FScalarChild(ul))
{
CCTEMap *pcmChild = exprhdl.Pdpplan(ul)->GetCostModel();
GPOS_ASSERT(nullptr != pcmChild);
CCTEMap *pcmCombined = CCTEMap::PcmCombine(mp, *pcm, *pcmChild);
pcm->Release();
pcm = pcmCombined;
}
}
return pcm;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::FProvidesReqdCTEs
//
// @doc:
// Check if required CTEs are included in derived CTE map
//
//---------------------------------------------------------------------------
BOOL
CPhysical::FProvidesReqdCTEs(CExpressionHandle &exprhdl,
const CCTEReq *pcter) const
{
CCTEMap *pcmDrvd = CDrvdPropPlan::Pdpplan(exprhdl.Pdp())->GetCostModel();
GPOS_ASSERT(nullptr != pcmDrvd);
return pcmDrvd->FSatisfies(pcter);
}
CEnfdProp::EPropEnforcingType
CPhysical::EpetDistribution(CExpressionHandle &exprhdl,
const CEnfdDistribution *ped) const
{
GPOS_ASSERT(nullptr != ped);
// get distribution delivered by the physical node
CDistributionSpec *pds = CDrvdPropPlan::Pdpplan(exprhdl.Pdp())->Pds();
if (ped->FCompatible(pds))
{
// required distribution is already provided
return CEnfdProp::EpetUnnecessary;
}
// required distribution will be enforced on Assert's output
return CEnfdProp::EpetRequired;
}
// Generate a singleton distribution spec request
CDistributionSpec *
CPhysical::PdsRequireSingleton(CMemoryPool *mp, CExpressionHandle &exprhdl,
CDistributionSpec *pds, ULONG child_index)
{
if (CDistributionSpec::EdtSingleton == pds->Edt())
{
return PdsPassThru(mp, exprhdl, pds, child_index);
}
return GPOS_NEW(mp) CDistributionSpecSingleton();
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::GetSkew
//
// @doc:
// Helper to compute skew estimate based on given stats and
// distribution spec
//
//---------------------------------------------------------------------------
CDouble
CPhysical::GetSkew(IStatistics *stats, CDistributionSpec *pds)
{
CDouble dSkew = 1.0;
if (CDistributionSpec::EdtHashed == pds->Edt())
{
CDistributionSpecHashed *pdshashed =
CDistributionSpecHashed::PdsConvert(pds);
const CExpressionArray *pdrgpexpr = pdshashed->Pdrgpexpr();
const ULONG size = pdrgpexpr->Size();
for (ULONG ul = 0; ul < size; ul++)
{
CExpression *pexpr = (*pdrgpexpr)[ul];
if (COperator::EopScalarIdent == pexpr->Pop()->Eopid())
{
// consider only hashed distribution direct columns for now
CScalarIdent *popScId = CScalarIdent::PopConvert(pexpr->Pop());
ULONG colid = popScId->Pcr()->Id();
CDouble dSkewCol = stats->GetSkew(colid);
if (dSkewCol > dSkew)
{
dSkew = dSkewCol;
}
}
}
}
return CDouble(dSkew);
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::FChildrenHaveCompatibleDistributions
//
// @doc:
// Returns true iff the delivered distributions of the children are
// compatible among themselves.
//
//---------------------------------------------------------------------------
BOOL
CPhysical::FCompatibleChildrenDistributions(
const CExpressionHandle &exprhdl) const
{
GPOS_ASSERT(exprhdl.Pop() == this);
BOOL fSingletonOrUniversalChild = false;
BOOL fNotSingletonOrUniversalDistributedChild = false;
const ULONG arity = exprhdl.Arity();
for (ULONG ul = 0; ul < arity; ul++)
{
if (!exprhdl.FScalarChild(ul))
{
CDrvdPropPlan *pdpplanChild = exprhdl.Pdpplan(ul);
// an operator cannot have a singleton or universal distributed child
// and one distributed on multiple nodes
// this assumption is safe for all current operators, but it can be
// too conservative: we could allow for instance the following cases
// * LeftOuterJoin (universal, distributed)
// * AntiSemiJoin (universal, distributed)
// These cases can be enabled if considered necessary by overriding
// this function.
if (CDistributionSpec::EdtUniversal == pdpplanChild->Pds()->Edt() ||
pdpplanChild->Pds()->FSingletonOrStrictSingleton())
{
fSingletonOrUniversalChild = true;
}
else
{
fNotSingletonOrUniversalDistributedChild = true;
}
if (fSingletonOrUniversalChild &&
fNotSingletonOrUniversalDistributedChild)
{
return false;
}
}
}
return true;
}
//---------------------------------------------------------------------------
// @function:
// CPhysical::FUnaryUsesDefinedColumns
//
// @doc:
// Return true if the given column set includes any of the columns defined
// by the unary node, as given by the handle
//
//---------------------------------------------------------------------------
BOOL
CPhysical::FUnaryUsesDefinedColumns(CColRefSet *pcrs,
CExpressionHandle &exprhdl)
{
GPOS_ASSERT(nullptr != pcrs);
GPOS_ASSERT(2 == exprhdl.Arity() && "Not a unary operator");
if (0 == pcrs->Size())
{
return false;
}
return !pcrs->IsDisjoint(exprhdl.DeriveDefinedColumns(1));
}
CEnfdDistribution::EDistributionMatching
CPhysical::Edm(CReqdPropPlan *, ULONG, CDrvdPropArray *, ULONG)
{
// by default, request distribution satisfaction
return CEnfdDistribution::EdmSatisfy;
}
CEnfdOrder::EOrderMatching
CPhysical::Eom(CReqdPropPlan *, ULONG, CDrvdPropArray *, ULONG)
{
// request satisfaction by default
return CEnfdOrder::EomSatisfy;
}
CEnfdRewindability::ERewindabilityMatching
CPhysical::Erm(CReqdPropPlan *, ULONG, CDrvdPropArray *, ULONG)
{
// request satisfaction by default
return CEnfdRewindability::ErmSatisfy;
}
CEnfdDistribution *
CPhysical::Ped(CMemoryPool *mp, CExpressionHandle &exprhdl,
CReqdPropPlan *prppInput, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt, ULONG ulDistrReq)
{
return GPOS_NEW(mp) CEnfdDistribution(
PdsRequired(mp, exprhdl, prppInput->Ped()->PdsRequired(), child_index,
pdrgpdpCtxt, ulDistrReq),
Edm(prppInput, child_index, pdrgpdpCtxt, ulDistrReq));
;
}
CPartitionPropagationSpec *
CPhysical::PppsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CPartitionPropagationSpec *pppsRequired,
ULONG child_index, CDrvdPropArray *, ULONG) const
{
// pass through consumer<x> requests to the appropriate child.
// do not pass through any propagator<x> requests
CPartitionPropagationSpec *pps_result =
GPOS_NEW(mp) CPartitionPropagationSpec(mp);
CBitSet *allowed_scan_ids = GPOS_NEW(mp) CBitSet(mp);
CPartInfo *part_info = exprhdl.DerivePartitionInfo(child_index);
for (ULONG ul = 0; ul < part_info->UlConsumers(); ++ul)
{
ULONG scan_id = part_info->ScanId(ul);
allowed_scan_ids->ExchangeSet(scan_id);
}
pps_result->InsertAllowedConsumers(pppsRequired, allowed_scan_ids);
allowed_scan_ids->Release();
return pps_result;
}
CEnfdProp::EPropEnforcingType
CPhysical::EpetPartitionPropagation(
CExpressionHandle &exprhdl, const CEnfdPartitionPropagation *pps_reqd) const
{
GPOS_ASSERT(nullptr != pps_reqd);
CPartitionPropagationSpec *pps_drvd =
CDrvdPropPlan::Pdpplan(exprhdl.Pdp())->Ppps();
if (pps_reqd->FCompatible(pps_drvd))
{
// all requests are resolved
return CEnfdProp::EpetUnnecessary;
}
return CEnfdProp::EpetRequired;
}
CPartitionPropagationSpec *
CPhysical::PppsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl) const
{
CPartitionPropagationSpec *pps_result =
GPOS_NEW(mp) CPartitionPropagationSpec(mp);
for (ULONG ul = 0; ul < exprhdl.Arity(); ++ul)
{
if (exprhdl.FScalarChild(ul))
{
continue;
}
CPartitionPropagationSpec *pps = exprhdl.Pdpplan(ul)->Ppps();
pps_result->InsertAll(pps);
}
return pps_result;
}
// EOF
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