greenplumn CPhysicalJoin 源码
greenplumn CPhysicalJoin 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CPhysicalJoin.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CPhysicalJoin.cpp
//
// @doc:
// Implementation of physical join operator
//---------------------------------------------------------------------------
#include "gpos/base.h"
#include "gpopt/base/CCastUtils.h"
#include "gpopt/base/CDistributionSpecAny.h"
#include "gpopt/base/CDistributionSpecReplicated.h"
#include "gpopt/base/COptCtxt.h"
#include "gpopt/base/CUtils.h"
#include "gpopt/exception.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CPhysicalInnerIndexNLJoin.h"
#include "gpopt/operators/CPhysicalLeftOuterIndexNLJoin.h"
#include "gpopt/operators/CPredicateUtils.h"
#include "gpopt/operators/CScalarCmp.h"
#include "gpopt/operators/CScalarIsDistinctFrom.h"
#include "naucrates/md/IMDScalarOp.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::CPhysicalJoin
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CPhysicalJoin::CPhysicalJoin(CMemoryPool *mp, CXform::EXformId origin_xform)
: CPhysical(mp), m_origin_xform(origin_xform)
{
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::Matches
//
// @doc:
// Match operators
//
//---------------------------------------------------------------------------
BOOL
CPhysicalJoin::Matches(COperator *pop) const
{
return Eopid() == pop->Eopid();
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::PosPropagateToOuter
//
// @doc:
// Helper for propagating required sort order to outer child
//
//---------------------------------------------------------------------------
COrderSpec *
CPhysicalJoin::PosPropagateToOuter(CMemoryPool *mp, CExpressionHandle &exprhdl,
COrderSpec *posRequired)
{
// propagate the order requirement to the outer child only if all the columns
// specified by the order requirement come from the outer child
CColRefSet *pcrs = posRequired->PcrsUsed(mp);
BOOL fOuterSortCols = exprhdl.DeriveOutputColumns(0)->ContainsAll(pcrs);
pcrs->Release();
if (fOuterSortCols)
{
return PosPassThru(mp, exprhdl, posRequired, 0 /*child_index*/);
}
return GPOS_NEW(mp) COrderSpec(mp);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::PcrsRequired
//
// @doc:
// Compute required output columns of n-th child
//
//---------------------------------------------------------------------------
CColRefSet *
CPhysicalJoin::PcrsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CColRefSet *pcrsRequired, ULONG child_index,
CDrvdPropArray *, // pdrgpdpCtxt
ULONG // ulOptReq
)
{
GPOS_ASSERT(
child_index < 2 &&
"Required properties can only be computed on the relational child");
return PcrsChildReqd(mp, exprhdl, pcrsRequired, child_index,
2 /*ulScalarIndex*/);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::PcteRequired
//
// @doc:
// Compute required CTE map of the n-th child
//
//---------------------------------------------------------------------------
CCTEReq *
CPhysicalJoin::PcteRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CCTEReq *pcter, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG //ulOptReq
) const
{
GPOS_ASSERT(2 > child_index);
return PcterNAry(mp, exprhdl, pcter, child_index, pdrgpdpCtxt);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::FProvidesReqdCols
//
// @doc:
// Helper for checking if required columns are included in output columns
//
//---------------------------------------------------------------------------
BOOL
CPhysicalJoin::FProvidesReqdCols(CExpressionHandle &exprhdl,
CColRefSet *pcrsRequired,
ULONG // ulOptReq
) const
{
GPOS_ASSERT(nullptr != pcrsRequired);
GPOS_ASSERT(3 == exprhdl.Arity());
// union columns from relational children
CColRefSet *pcrs = GPOS_NEW(m_mp) CColRefSet(m_mp);
ULONG arity = exprhdl.Arity();
for (ULONG i = 0; i < arity - 1; i++)
{
CColRefSet *pcrsChild = exprhdl.DeriveOutputColumns(i);
pcrs->Union(pcrsChild);
}
BOOL fProvidesCols = pcrs->ContainsAll(pcrsRequired);
pcrs->Release();
return fProvidesCols;
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::FSortColsInOuterChild
//
// @doc:
// Helper for checking if required sort columns come from outer child
//
//----------------------------------------------------------------------------
BOOL
CPhysicalJoin::FSortColsInOuterChild(CMemoryPool *mp,
CExpressionHandle &exprhdl,
COrderSpec *pos)
{
GPOS_ASSERT(nullptr != pos);
CColRefSet *pcrsSort = pos->PcrsUsed(mp);
CColRefSet *pcrsOuterChild = exprhdl.DeriveOutputColumns(0 /*child_index*/);
BOOL fSortColsInOuter = pcrsOuterChild->ContainsAll(pcrsSort);
pcrsSort->Release();
return fSortColsInOuter;
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::FOuterProvidesReqdCols
//
// @doc:
// Helper for checking if the outer input of a binary join operator
// includes the required columns
//
//---------------------------------------------------------------------------
BOOL
CPhysicalJoin::FOuterProvidesReqdCols(CExpressionHandle &exprhdl,
CColRefSet *pcrsRequired)
{
GPOS_ASSERT(nullptr != pcrsRequired);
GPOS_ASSERT(3 == exprhdl.Arity() && "expected binary join");
CColRefSet *pcrsOutput = exprhdl.DeriveOutputColumns(0 /*child_index*/);
return pcrsOutput->ContainsAll(pcrsRequired);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::PdsRequired
//
// @doc:
// Compute required distribution of the n-th child;
// this function creates a request for ANY distribution on the outer
// child, then matches the delivered distribution on the inner child,
// this results in sending either a broadcast or singleton distribution
// requests to the inner child
//
//---------------------------------------------------------------------------
CDistributionSpec *
CPhysicalJoin::PdsRequired(CMemoryPool *mp GPOS_UNUSED,
CExpressionHandle &exprhdl GPOS_UNUSED,
CDistributionSpec *, //pdsRequired,
ULONG child_index GPOS_UNUSED,
CDrvdPropArray *pdrgpdpCtxt GPOS_UNUSED,
ULONG // ulOptReq
) const
{
GPOS_RAISE(
CException::ExmaInvalid, CException::ExmiInvalid,
GPOS_WSZ_LIT("PdsRequired should not be called for CPhysicalJoin"));
return nullptr;
}
CEnfdDistribution *
CPhysicalJoin::Ped(CMemoryPool *mp, CExpressionHandle &exprhdl,
CReqdPropPlan *prppInput, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt, ULONG ulDistrReq)
{
GPOS_ASSERT(2 > child_index);
CEnfdDistribution::EDistributionMatching dmatch =
Edm(prppInput, child_index, pdrgpdpCtxt, ulDistrReq);
CDistributionSpec *const pdsRequired = prppInput->Ped()->PdsRequired();
// if expression has to execute on a single host then we need a gather
if (exprhdl.NeedsSingletonExecution())
{
return GPOS_NEW(mp) CEnfdDistribution(
PdsRequireSingleton(mp, exprhdl, pdsRequired, child_index), dmatch);
}
if (exprhdl.HasOuterRefs())
{
if (CDistributionSpec::EdtSingleton == pdsRequired->Edt() ||
CDistributionSpec::EdtStrictReplicated == pdsRequired->Edt())
{
return GPOS_NEW(mp) CEnfdDistribution(
PdsPassThru(mp, exprhdl, pdsRequired, child_index), dmatch);
}
return GPOS_NEW(mp) CEnfdDistribution(
GPOS_NEW(mp)
CDistributionSpecReplicated(CDistributionSpec::EdtReplicated),
dmatch);
}
if (1 == child_index)
{
// compute a matching distribution based on derived distribution of outer child
CDistributionSpec *pdsOuter =
CDrvdPropPlan::Pdpplan((*pdrgpdpCtxt)[0])->Pds();
if (CDistributionSpec::EdtUniversal == pdsOuter->Edt())
{
// first child is universal, request second child to execute on a single host to avoid duplicates
return GPOS_NEW(mp) CEnfdDistribution(
GPOS_NEW(mp) CDistributionSpecSingleton(), dmatch);
}
if (CDistributionSpec::EdtSingleton == pdsOuter->Edt() ||
CDistributionSpec::EdtStrictSingleton == pdsOuter->Edt())
{
// require inner child to have matching singleton distribution
return GPOS_NEW(mp) CEnfdDistribution(
CPhysical::PdssMatching(
mp, CDistributionSpecSingleton::PdssConvert(pdsOuter)),
dmatch);
}
if ((GPOS_FTRACE(EopttraceEnableRedistributeNLLOJInnerChild) &&
this->Eopid() == COperator::EopPhysicalLeftOuterNLJoin))
{
CEnfdDistribution *pEnfdHashedDistribution =
CPhysicalJoin::PedInnerHashedFromOuterHashed(
mp, exprhdl, dmatch, (*pdrgpdpCtxt)[0]);
if (pEnfdHashedDistribution)
{
return pEnfdHashedDistribution;
}
}
// otherwise, require inner child to be replicated
return GPOS_NEW(mp) CEnfdDistribution(
GPOS_NEW(mp)
CDistributionSpecReplicated(CDistributionSpec::EdtReplicated),
CEnfdDistribution::EdmSatisfy);
}
// no distribution requirement on the outer side
return GPOS_NEW(mp) CEnfdDistribution(
GPOS_NEW(mp) CDistributionSpecAny(this->Eopid()), dmatch);
}
CEnfdDistribution *
CPhysicalJoin::PedInnerHashedFromOuterHashed(
CMemoryPool *mp, CExpressionHandle &exprhdl,
CEnfdDistribution::EDistributionMatching dmatch, CDrvdProp *outerDrvdProp)
{
// compute a matching distribution based on derived distribution of outer child
CDistributionSpec *pdsOuter = CDrvdPropPlan::Pdpplan(outerDrvdProp)->Pds();
if (CDistributionSpec::EdtHashed == pdsOuter->Edt())
{
// require inner child to have matching hashed distribution
CExpression *pexprScPredicate =
exprhdl.PexprScalarExactChild(2, true /*error_on_null_return*/);
CExpressionArray *pdrgpexpr =
CPredicateUtils::PdrgpexprConjuncts(mp, pexprScPredicate);
CExpressionArray *pdrgpexprMatching = GPOS_NEW(mp) CExpressionArray(mp);
CDistributionSpecHashed *pdshashed =
CDistributionSpecHashed::PdsConvert(pdsOuter);
CExpressionArray *pdrgpexprHashed = pdshashed->Pdrgpexpr();
const ULONG ulSize = pdrgpexprHashed->Size();
BOOL fSuccess = true;
for (ULONG ul = 0; fSuccess && ul < ulSize; ul++)
{
CExpression *pexpr = (*pdrgpexprHashed)[ul];
// get matching expression from predicate for the corresponding outer child
// to create CDistributionSpecHashed for inner child
CExpression *pexprMatching =
CUtils::PexprMatchEqualityOrINDF(pexpr, pdrgpexpr);
fSuccess = (nullptr != pexprMatching &&
CUtils::FScalarIdent(pexprMatching));
if (fSuccess)
{
IMDId *pmdidTypeInner =
CScalar::PopConvert(pexprMatching->Pop())->MdidType();
CMDAccessor *md_accessor = COptCtxt::PoctxtFromTLS()->Pmda();
if (md_accessor->RetrieveType(pmdidTypeInner)->IsHashable())
{
pexprMatching->AddRef();
pdrgpexprMatching->Append(pexprMatching);
}
else
{
fSuccess = false;
}
}
}
pdrgpexpr->Release();
if (fSuccess)
{
GPOS_ASSERT(pdrgpexprMatching->Size() == pdrgpexprHashed->Size());
// create a matching hashed distribution request
BOOL fNullsColocated = pdshashed->FNullsColocated();
CDistributionSpecHashed *pdshashedEquiv = GPOS_NEW(mp)
CDistributionSpecHashed(pdrgpexprMatching, fNullsColocated);
pdshashedEquiv->ComputeEquivHashExprs(mp, exprhdl);
return GPOS_NEW(mp) CEnfdDistribution(pdshashedEquiv, dmatch);
}
pdrgpexprMatching->Release();
}
return nullptr;
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::PdsDerive
//
// @doc:
// Derive distribution
//
//---------------------------------------------------------------------------
CDistributionSpec *
CPhysicalJoin::PdsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl) const
{
CDistributionSpec *pdsOuter = exprhdl.Pdpplan(0 /*child_index*/)->Pds();
CDistributionSpec *pdsInner = exprhdl.Pdpplan(1 /*child_index*/)->Pds();
// We must use the non-nullable side for the distribution spec for outer joins.
// For right join, the hash side is the non-nullable side, so we swap the inner/outer
// distribution specs for the logic below
if (exprhdl.Pop()->Eopid() == EopPhysicalRightOuterHashJoin)
{
pdsOuter = exprhdl.Pdpplan(1 /*child_index*/)->Pds();
pdsInner = exprhdl.Pdpplan(0 /*child_index*/)->Pds();
}
CDistributionSpec *pds;
if (CDistributionSpec::EdtStrictReplicated == pdsOuter->Edt() ||
CDistributionSpec::EdtTaintedReplicated == pdsOuter->Edt() ||
CDistributionSpec::EdtUniversal == pdsOuter->Edt())
{
// if outer is replicated/universal, return inner distribution
pds = pdsInner;
}
else
{
// otherwise, return outer distribution
pds = pdsOuter;
}
if (CDistributionSpec::EdtHashed == pds->Edt())
{
CDistributionSpecHashed *pdsHashed =
CDistributionSpecHashed::PdsConvert(pds);
// Clean up any incomplete distribution specs since they can no longer be completed above
// Note that, since this is done at the lowest join, no relevant equivalent specs are lost.
if (!pdsHashed->HasCompleteEquivSpec(mp))
{
CExpressionArray *pdrgpexpr = pdsHashed->Pdrgpexpr();
IMdIdArray *opfamilies = pdsHashed->Opfamilies();
if (nullptr != opfamilies)
{
opfamilies->AddRef();
}
pdrgpexpr->AddRef();
return GPOS_NEW(mp) CDistributionSpecHashed(
pdrgpexpr, pdsHashed->FNullsColocated(), opfamilies);
}
}
pds->AddRef();
return pds;
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::PrsDerive
//
// @doc:
// Derive rewindability
//
//---------------------------------------------------------------------------
CRewindabilitySpec *
CPhysicalJoin::PrsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl) const
{
CRewindabilitySpec *prsOuter = exprhdl.Pdpplan(0 /*child_index*/)->Prs();
GPOS_ASSERT(nullptr != prsOuter);
CRewindabilitySpec *prsInner = exprhdl.Pdpplan(1 /*child_index*/)->Prs();
GPOS_ASSERT(nullptr != prsInner);
CRewindabilitySpec::EMotionHazardType motion_hazard =
(prsOuter->HasMotionHazard() || prsInner->HasMotionHazard())
? CRewindabilitySpec::EmhtMotion
: CRewindabilitySpec::EmhtNoMotion;
// TODO: shardikar; Implement a separate PrsDerive() for HashJoins since it
// is different from NLJ; the inner of a HJ child is rewindable (due to a
// Hash op on the inner side)
// If both children are rewindable, the join is also rewinable
if (prsOuter->IsRewindable() && prsInner->IsRewindable())
{
return GPOS_NEW(mp) CRewindabilitySpec(
CRewindabilitySpec::ErtRewindable, motion_hazard);
}
// If either child is ErtNone (neither rewindable, rescannable nor mark-restore), then the join is also ErtNone
else if (prsOuter->Ert() == CRewindabilitySpec::ErtNone ||
prsInner->Ert() == CRewindabilitySpec::ErtNone)
{
return GPOS_NEW(mp)
CRewindabilitySpec(CRewindabilitySpec::ErtNone, motion_hazard);
}
// If the children are in any other combination, e.g (rescannable, rewindable, markrestore) etc,
// derive rescannable for the join
else
{
return GPOS_NEW(mp) CRewindabilitySpec(
CRewindabilitySpec::ErtRescannable, motion_hazard);
}
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::EpetRewindability
//
// @doc:
// Return the enforcing type for rewindability property based on this operator
//
//---------------------------------------------------------------------------
CEnfdProp::EPropEnforcingType
CPhysicalJoin::EpetRewindability(CExpressionHandle &exprhdl,
const CEnfdRewindability *per) const
{
// get rewindability delivered by the join node
CRewindabilitySpec *prs = CDrvdPropPlan::Pdpplan(exprhdl.Pdp())->Prs();
if (per->FCompatible(prs))
{
// required rewindability will be established by the join operator
return CEnfdProp::EpetUnnecessary;
}
// required rewindability will be enforced on join's output
return CEnfdProp::EpetRequired;
}
// Do each of the given predicate children use columns from a different
// join child? For this method to return true, either:
// - pexprPredInner uses columns from pexprInner and pexprPredOuter uses
// columns from pexprOuter; or
// - pexprPredInner uses columns from pexprOuter and pexprPredOuter uses
// columns from pexprInner
BOOL
CPhysicalJoin::FPredKeysSeparated(CExpression *pexprInner,
CExpression *pexprOuter,
CExpression *pexprPredInner,
CExpression *pexprPredOuter)
{
GPOS_ASSERT(nullptr != pexprOuter);
GPOS_ASSERT(nullptr != pexprInner);
GPOS_ASSERT(nullptr != pexprPredOuter);
GPOS_ASSERT(nullptr != pexprPredInner);
CColRefSet *pcrsUsedPredOuter = pexprPredOuter->DeriveUsedColumns();
CColRefSet *pcrsUsedPredInner = pexprPredInner->DeriveUsedColumns();
CColRefSet *outer_refs = pexprOuter->DeriveOutputColumns();
CColRefSet *pcrsInner = pexprInner->DeriveOutputColumns();
// make sure that each predicate child uses columns from a different join child
// in order to reject predicates of the form 'X Join Y on f(X.a, Y.b) = 5'
BOOL fPredOuterUsesJoinOuterChild =
(0 < pcrsUsedPredOuter->Size()) &&
outer_refs->ContainsAll(pcrsUsedPredOuter);
BOOL fPredOuterUsesJoinInnerChild =
(0 < pcrsUsedPredOuter->Size()) &&
pcrsInner->ContainsAll(pcrsUsedPredOuter);
BOOL fPredInnerUsesJoinOuterChild =
(0 < pcrsUsedPredInner->Size()) &&
outer_refs->ContainsAll(pcrsUsedPredInner);
BOOL fPredInnerUsesJoinInnerChild =
(0 < pcrsUsedPredInner->Size()) &&
pcrsInner->ContainsAll(pcrsUsedPredInner);
return (fPredOuterUsesJoinOuterChild && fPredInnerUsesJoinInnerChild) ||
(fPredOuterUsesJoinInnerChild && fPredInnerUsesJoinOuterChild);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::FHashJoinCompatible
//
// @doc:
// Is given predicate hash-join compatible?
// the function returns True if predicate is of the form (Equality) or
// (Is Not Distinct From), both operands are hashjoinable, AND the predicate
// uses columns from both join children
//
//---------------------------------------------------------------------------
BOOL
CPhysicalJoin::FHashJoinCompatible(
CExpression *pexprPred, // predicate in question
CExpression *pexprOuter, // outer child of the join
CExpression *pexprInner // inner child of the join
)
{
GPOS_ASSERT(nullptr != pexprPred);
GPOS_ASSERT(nullptr != pexprOuter);
GPOS_ASSERT(nullptr != pexprInner);
GPOS_ASSERT(pexprOuter != pexprInner);
CExpression *pexprPredOuter = nullptr;
CExpression *pexprPredInner = nullptr;
IMDId *mdid_scop = nullptr;
if (CPredicateUtils::IsEqualityOp(pexprPred))
{
pexprPredOuter = (*pexprPred)[0];
pexprPredInner = (*pexprPred)[1];
mdid_scop = CScalarCmp::PopConvert(pexprPred->Pop())->MdIdOp();
}
else if (CPredicateUtils::FINDF(pexprPred))
{
CExpression *pexpr = (*pexprPred)[0];
pexprPredOuter = (*pexpr)[0];
pexprPredInner = (*pexpr)[1];
mdid_scop = CScalarIsDistinctFrom::PopConvert(pexpr->Pop())->MdIdOp();
}
else
{
return false;
}
IMDId *pmdidTypeOuter =
CScalar::PopConvert(pexprPredOuter->Pop())->MdidType();
IMDId *pmdidTypeInner =
CScalar::PopConvert(pexprPredInner->Pop())->MdidType();
CMDAccessor *md_accessor = COptCtxt::PoctxtFromTLS()->Pmda();
const IMDScalarOp *scop = md_accessor->RetrieveScOp(mdid_scop);
if (GPOS_FTRACE(EopttraceConsiderOpfamiliesForDistribution) &&
nullptr == scop->HashOpfamilyMdid())
{
return false;
}
if (md_accessor->RetrieveType(pmdidTypeOuter)->IsHashable() &&
md_accessor->RetrieveType(pmdidTypeInner)->IsHashable())
{
return FPredKeysSeparated(pexprInner, pexprOuter, pexprPredInner,
pexprPredOuter);
}
return false;
}
BOOL
CPhysicalJoin::FMergeJoinCompatible(
CExpression *pexprPred, // predicate in question
CExpression *pexprOuter, // outer child of the join
CExpression *pexprInner // inner child of the join
)
{
GPOS_ASSERT(nullptr != pexprPred);
GPOS_ASSERT(nullptr != pexprOuter);
GPOS_ASSERT(nullptr != pexprInner);
GPOS_ASSERT(pexprOuter != pexprInner);
CExpression *pexprPredOuter = nullptr;
CExpression *pexprPredInner = nullptr;
IMDId *mdid_scop = nullptr;
// Only merge join between ScalarIdents of the same types is currently supported
if (CPredicateUtils::FEqIdentsOfSameType(pexprPred))
{
pexprPredOuter = (*pexprPred)[0];
pexprPredInner = (*pexprPred)[1];
mdid_scop = CScalarCmp::PopConvert(pexprPred->Pop())->MdIdOp();
GPOS_ASSERT(CUtils::FScalarIdent(pexprPredOuter));
GPOS_ASSERT(CUtils::FScalarIdent(pexprPredInner));
}
else
{
return false;
}
IMDId *pmdidTypeOuter =
CScalar::PopConvert(pexprPredOuter->Pop())->MdidType();
IMDId *pmdidTypeInner =
CScalar::PopConvert(pexprPredInner->Pop())->MdidType();
CMDAccessor *mda = COptCtxt::PoctxtFromTLS()->Pmda();
if (GPOS_FTRACE(EopttraceConsiderOpfamiliesForDistribution))
{
const IMDScalarOp *op = mda->RetrieveScOp(mdid_scop);
const IMDType *left_type = mda->RetrieveType(pmdidTypeOuter);
const IMDType *right_type = mda->RetrieveType(pmdidTypeInner);
// MJ sends Sort requests whose btree opclass must match that of the join
// clause. ORCA currently doesn't have support to retrive the information
// to send such requests.
// So, check that hash family used for distribution matches the default for
// its operands' types. This must match the operator using in
// CPhysicalFullMergeJoin::PosRequired().
if (!CUtils::Equals(op->HashOpfamilyMdid(),
left_type->GetDistrOpfamilyMdid()) ||
!CUtils::Equals(op->HashOpfamilyMdid(),
right_type->GetDistrOpfamilyMdid()))
{
return false;
}
}
// MJ sends a distribution request for merge clauses on both sides, they
// must, therefore, be hashable and merge joinable.
if (mda->RetrieveType(pmdidTypeOuter)->IsHashable() &&
mda->RetrieveType(pmdidTypeInner)->IsHashable() &&
mda->RetrieveType(pmdidTypeOuter)->IsMergeJoinable() &&
mda->RetrieveType(pmdidTypeInner)->IsMergeJoinable())
{
return FPredKeysSeparated(pexprInner, pexprOuter, pexprPredInner,
pexprPredOuter);
}
return false;
}
// Check for equality and INDFs in the predicates, and also aligns the expressions inner and outer keys with the predicates
// For example foo (a int, b int) and bar (c int, d int), will need to be aligned properly if the predicate is d = a)
void
CPhysicalJoin::AlignJoinKeyOuterInner(CExpression *pexprPred,
CExpression *pexprOuter,
#ifdef GPOS_DEBUG
CExpression *pexprInner,
#else
CExpression *,
#endif // GPOS_DEBUG
CExpression **ppexprKeyOuter,
CExpression **ppexprKeyInner,
IMDId **mdid_scop)
{
// we should not be here if there are outer references
GPOS_ASSERT(nullptr != ppexprKeyOuter);
GPOS_ASSERT(nullptr != ppexprKeyInner);
CExpression *pexprPredOuter = nullptr;
CExpression *pexprPredInner = nullptr;
// extract left & right children from pexprPred for all supported ops
if (CPredicateUtils::IsEqualityOp(pexprPred))
{
pexprPredOuter = (*pexprPred)[0];
pexprPredInner = (*pexprPred)[1];
*mdid_scop = CScalarCmp::PopConvert(pexprPred->Pop())->MdIdOp();
}
else if (CPredicateUtils::FINDF(pexprPred))
{
CExpression *pexpr = (*pexprPred)[0];
pexprPredOuter = (*pexpr)[0];
pexprPredInner = (*pexpr)[1];
*mdid_scop = CScalarIsDistinctFrom::PopConvert(pexpr->Pop())->MdIdOp();
}
else
{
GPOS_RAISE(
gpopt::ExmaGPOPT, gpopt::ExmiUnsupportedOp,
GPOS_WSZ_LIT("Invalid join expression in AlignJoinKeyOuterInner"));
}
GPOS_ASSERT(nullptr != pexprPredOuter);
GPOS_ASSERT(nullptr != pexprPredInner);
CColRefSet *pcrsOuter = pexprOuter->DeriveOutputColumns();
CColRefSet *pcrsPredOuter = pexprPredOuter->DeriveUsedColumns();
#ifdef GPOS_DEBUG
CColRefSet *pcrsInner = pexprInner->DeriveOutputColumns();
CColRefSet *pcrsPredInner = pexprPredInner->DeriveUsedColumns();
#endif // GPOS_DEBUG
CExpression *pexprOuterKeyWithoutBCC =
CCastUtils::PexprWithoutBinaryCoercibleCasts(pexprPredOuter);
CExpression *pexprInnerKeyWithoutBCC =
CCastUtils::PexprWithoutBinaryCoercibleCasts(pexprPredInner);
if (pcrsOuter->ContainsAll(pcrsPredOuter))
{
*ppexprKeyOuter = pexprOuterKeyWithoutBCC;
GPOS_ASSERT(pcrsInner->ContainsAll(pcrsPredInner));
*ppexprKeyInner = pexprInnerKeyWithoutBCC;
}
else
{
GPOS_ASSERT(pcrsOuter->ContainsAll(pcrsPredInner));
*ppexprKeyOuter = pexprInnerKeyWithoutBCC;
GPOS_ASSERT(pcrsInner->ContainsAll(pcrsPredOuter));
*ppexprKeyInner = pexprOuterKeyWithoutBCC;
}
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::FProcessingChildWithPartConsumer
//
// @doc:
// Check whether the child being processed is the child that has the part consumer
//
//---------------------------------------------------------------------------
BOOL
CPhysicalJoin::FProcessingChildWithPartConsumer(BOOL fOuterPartConsumerTest,
ULONG ulChildIndexToTestFirst,
ULONG ulChildIndexToTestSecond,
ULONG child_index)
{
return (fOuterPartConsumerTest && ulChildIndexToTestFirst == child_index) ||
(!fOuterPartConsumerTest && ulChildIndexToTestSecond == child_index);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::FFirstChildToOptimize
//
// @doc:
// Helper to check if given child index correspond to first
// child to be optimized
//
//---------------------------------------------------------------------------
BOOL
CPhysicalJoin::FFirstChildToOptimize(ULONG child_index) const
{
GPOS_ASSERT(2 > child_index);
EChildExecOrder eceo = Eceo();
return (EceoLeftToRight == eceo && 0 == child_index) ||
(EceoRightToLeft == eceo && 1 == child_index);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::UlDistrRequestsForCorrelatedJoin
//
// @doc:
// Return number of distribution requests for correlated join
//
//---------------------------------------------------------------------------
ULONG
CPhysicalJoin::UlDistrRequestsForCorrelatedJoin()
{
// Correlated Join creates two distribution requests to enforce distribution of its children:
// Req(0): If incoming distribution is (Strict) Singleton, pass it through to all children
// to comply with correlated execution requirements
// Req(1): Request outer child for ANY distribution, and then match it on the inner child
return 2;
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::PrsRequiredCorrelatedJoin
//
// @doc:
// Helper to compute required rewindability of correlated join's children
//
//---------------------------------------------------------------------------
CRewindabilitySpec *
CPhysicalJoin::PrsRequiredCorrelatedJoin(CMemoryPool *mp,
CExpressionHandle &exprhdl,
CRewindabilitySpec *prsRequired,
ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG // ulOptReq
)
{
GPOS_ASSERT(3 == exprhdl.Arity());
GPOS_ASSERT(2 > child_index);
GPOS_ASSERT(CUtils::FCorrelatedNLJoin(exprhdl.Pop()));
if (1 == child_index)
{
CRewindabilitySpec *prsOuter =
CDrvdPropPlan::Pdpplan((*pdrgpdpCtxt)[0 /*outer child*/])->Prs();
CRewindabilitySpec::EMotionHazardType motion_hazard =
GPOS_FTRACE(EopttraceMotionHazardHandling) &&
(prsOuter->HasMotionHazard() ||
prsRequired->HasMotionHazard())
? CRewindabilitySpec::EmhtMotion
: CRewindabilitySpec::EmhtNoMotion;
return GPOS_NEW(mp) CRewindabilitySpec(
CRewindabilitySpec::ErtRescannable, motion_hazard);
}
GPOS_ASSERT(0 == child_index);
return PrsPassThru(mp, exprhdl, prsRequired, 0 /*child_index*/);
}
CEnfdDistribution *
CPhysicalJoin::PedCorrelatedJoin(CMemoryPool *mp, CExpressionHandle &exprhdl,
CReqdPropPlan *prppInput, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt, ULONG ulOptReq)
{
GPOS_ASSERT(3 == exprhdl.Arity());
GPOS_ASSERT(2 > child_index);
GPOS_ASSERT(CUtils::FCorrelatedNLJoin(exprhdl.Pop()));
CDistributionSpec *const pdsRequired = prppInput->Ped()->PdsRequired();
if (0 == ulOptReq && pdsRequired->FSingletonOrStrictSingleton())
{
// propagate Singleton request to children to comply with
// correlated execution requirements
return GPOS_NEW(mp) CEnfdDistribution(
PdsPassThru(mp, exprhdl, pdsRequired, child_index),
CEnfdDistribution::EdmSatisfy);
}
if (exprhdl.PfpChild(1)->FHasVolatileFunctionScan() &&
exprhdl.HasOuterRefs(1))
{
// if the inner child has a volatile TVF and has outer refs then request
// gather from both children
return GPOS_NEW(mp)
CEnfdDistribution(GPOS_NEW(mp) CDistributionSpecSingleton(),
CEnfdDistribution::EdmSatisfy);
}
if (1 == child_index)
{
CDistributionSpec *pdsOuter =
CDrvdPropPlan::Pdpplan((*pdrgpdpCtxt)[0])->Pds();
if (CDistributionSpec::EdtUniversal == pdsOuter->Edt())
{
// if outer child delivers a universal distribution, request inner child
// to match Singleton distribution to detect more than one row generated
// at runtime, for example: 'select (select 1 union select 2)'
return GPOS_NEW(mp)
CEnfdDistribution(GPOS_NEW(mp) CDistributionSpecSingleton(),
CEnfdDistribution::EdmSatisfy);
}
}
return CPhysicalJoin::Ped(mp, exprhdl, prppInput, child_index, pdrgpdpCtxt,
ulOptReq);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::Edm
//
// @doc:
// Distribution matching type
//
//---------------------------------------------------------------------------
CEnfdDistribution::EDistributionMatching
CPhysicalJoin::Edm(CReqdPropPlan *, // prppInput
ULONG child_index, CDrvdPropArray *pdrgpdpCtxt,
ULONG // ulOptReq
)
{
if (FFirstChildToOptimize(child_index))
{
// use satisfaction for the first child to be optimized
return CEnfdDistribution::EdmSatisfy;
}
// extract distribution type of previously optimized child
GPOS_ASSERT(nullptr != pdrgpdpCtxt);
CDistributionSpec::EDistributionType edtPrevChild =
CDrvdPropPlan::Pdpplan((*pdrgpdpCtxt)[0])->Pds()->Edt();
if (CDistributionSpec::EdtStrictReplicated == edtPrevChild ||
CDistributionSpec::EdtUniversal == edtPrevChild)
{
// if previous child is replicated or universal, we use
// distribution satisfaction for current child
return CEnfdDistribution::EdmSatisfy;
}
// use exact matching for all other children
return CEnfdDistribution::EdmExact;
}
// EOF
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