//---------------------------------------------------------------------------
// @function:
// CPartIndexMap::AddUnresolved
//
// @doc:
// Helper to add part-index id's found in the first map and are
// unresolved based on the second map
//
// For example, if the first and second map contain the following entries:
// pimFst:
// (partindexid: 1, consumer, part cnstr: 5->[1,3)),
// (partindexid: 2, consumer, part cnstr: <>),
// pimSnd:
// (partindexid: 1, consumer, part cnstr: 6->(4,5))),
// (partindexid: 2, producer, part cnstr: <>),
// (partindexid: 3, producer, part cnstr: <>)
// the result will be:
// (partindexid: 1, consumer, part cnstr: 5->[1,3), 6->(4,5)), // part constraint get combined
// (partindexid: 2, resolver, part cnstr: <>), // consumer+producer=resolver
// (partindexid: 3, producer, part cnstr: <>) // no match for part index id 3: copy out
//
//---------------------------------------------------------------------------
void
CPartIndexMap::AddUnresolved
(
IMemoryPool *pmp,
const CPartIndexMap &pimFst,
const CPartIndexMap &pimSnd,
CPartIndexMap* ppimResult
)
{
// iterate on first map and lookup entries in second map
PartIndexMapIter pimiFst(pimFst.m_pim);
while (pimiFst.FAdvance())
{
const CPartTableInfo *pptiFst = pimiFst.Pt();
ULONG ulScanId = pptiFst->UlScanId();
EPartIndexManipulator epimFst = pptiFst->Epim();
ULONG ulPropagatorsFst = pptiFst->UlExpectedPropagators();
if (NULL != ppimResult->PptiLookup(ulScanId))
{
// skip entries already in the result map
continue;
}
// check if entry exists in second map
CPartTableInfo *pptiSnd = pimSnd.PptiLookup(ulScanId);
EPartIndexManipulator epimResult = epimFst;
ULONG ulPropagatorsResult = ulPropagatorsFst;
PartCnstrMap *ppartcnstrmapSnd = NULL;
if (NULL != pptiSnd)
{
EPartIndexManipulator epimSnd = pptiSnd->Epim();
ULONG ulPropagatorsSnd = pptiSnd->UlExpectedPropagators();
GPOS_ASSERT_IMP(epimFst == EpimConsumer && epimSnd == EpimConsumer, ulPropagatorsFst == ulPropagatorsSnd);
ResolvePropagator(epimFst, ulPropagatorsFst, epimSnd, ulPropagatorsSnd, &epimResult, &ulPropagatorsResult);
ppartcnstrmapSnd = pptiSnd->Ppartcnstrmap();
}
// copy mdid and partition columns from part index map entry
IMDId *pmdid = pptiFst->Pmdid();
DrgPpartkeys *pdrgppartkeys = pptiFst->Pdrgppartkeys();
CPartConstraint *ppartcnstrRel = pptiFst->PpartcnstrRel();
PartCnstrMap *ppartcnstrmap = CPartConstraint::PpartcnstrmapCombine(pmp, pptiFst->Ppartcnstrmap(), ppartcnstrmapSnd);
pmdid->AddRef();
pdrgppartkeys->AddRef();
ppartcnstrRel->AddRef();
ppimResult->Insert(ulScanId, ppartcnstrmap, epimResult, ulPropagatorsResult, pmdid, pdrgppartkeys, ppartcnstrRel);
}
}
//---------------------------------------------------------------------------
// @function:
// CPartIndexMap::PpimPartitionSelector
//
// @doc:
// Return a new part index map for a partition selector with the given
// scan id, and the given number of expected selectors above it
//
//---------------------------------------------------------------------------
CPartIndexMap *
CPartIndexMap::PpimPartitionSelector
(
IMemoryPool *pmp,
ULONG ulScanId,
ULONG ulExpectedFromReq
)
const
{
CPartIndexMap *ppimResult = GPOS_NEW(pmp) CPartIndexMap(pmp);
PartIndexMapIter pimi(m_pim);
while (pimi.FAdvance())
{
const CPartTableInfo *ppti = pimi.Pt();
PartCnstrMap *ppartcnstrmap = ppti->Ppartcnstrmap();
IMDId *pmdid = ppti->Pmdid();
DrgPpartkeys *pdrgppartkeys = ppti->Pdrgppartkeys();
CPartConstraint *ppartcnstrRel = ppti->PpartcnstrRel();
ppartcnstrmap->AddRef();
pmdid->AddRef();
pdrgppartkeys->AddRef();
ppartcnstrRel->AddRef();
EPartIndexManipulator epim = ppti->Epim();
ULONG ulExpectedPropagators = ppti->UlExpectedPropagators();
if (ppti->UlScanId() == ulScanId)
{
if (0 == ulExpectedFromReq)
{
// this are no other expected partition selectors
// so this scan id is resolved
epim = EpimResolver;
ulExpectedPropagators = 0;
}
else
{
// this is not resolved yet
epim = EpimConsumer;
ulExpectedPropagators = ulExpectedFromReq;
}
}
ppimResult->Insert(ppti->UlScanId(), ppartcnstrmap, epim, ulExpectedPropagators, pmdid, pdrgppartkeys, ppartcnstrRel);
}
return ppimResult;
}
//---------------------------------------------------------------------------
// @function:
// CPartitionPropagationSpec::FRequiresPartitionPropagation
//
// @doc:
// Check if given part index id needs to be enforced on top of the given
// expression
//
//---------------------------------------------------------------------------
BOOL
CPartitionPropagationSpec::FRequiresPartitionPropagation
(
IMemoryPool *pmp,
CExpression *pexpr,
CExpressionHandle &exprhdl,
ULONG ulPartIndexId
)
const
{
GPOS_ASSERT(m_ppim->FContains(ulPartIndexId));
// construct partition propagation spec with the given id only, and check if it needs to be
// enforced on top
CPartIndexMap *ppim = GPOS_NEW(pmp) CPartIndexMap(pmp);
IMDId *pmdid = m_ppim->PmdidRel(ulPartIndexId);
DrgPpartkeys *pdrgppartkeys = m_ppim->Pdrgppartkeys(ulPartIndexId);
CPartConstraint *ppartcnstr = m_ppim->PpartcnstrRel(ulPartIndexId);
PartCnstrMap *ppartcnstrmap = m_ppim->Ppartcnstrmap(ulPartIndexId);
pmdid->AddRef();
pdrgppartkeys->AddRef();
ppartcnstr->AddRef();
ppartcnstrmap->AddRef();
ppim->Insert(ulPartIndexId, ppartcnstrmap, m_ppim->Epim(ulPartIndexId), m_ppim->UlExpectedPropagators(ulPartIndexId), pmdid, pdrgppartkeys, ppartcnstr);
CPartitionPropagationSpec *ppps = GPOS_NEW(pmp) CPartitionPropagationSpec(ppim, GPOS_NEW(pmp) CPartFilterMap(pmp));
CEnfdPartitionPropagation *pepp = GPOS_NEW(pmp) CEnfdPartitionPropagation(ppps, CEnfdPartitionPropagation::EppmSatisfy, GPOS_NEW(pmp) CPartFilterMap(pmp));
CEnfdProp::EPropEnforcingType epetPartitionPropagation = pepp->Epet(exprhdl, CPhysical::PopConvert(pexpr->Pop()), true /*fPartitionPropagationRequired*/);
pepp->Release();
return CEnfdProp::FEnforce(epetPartitionPropagation);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalPartitionSelector::PppsRequired
//
// @doc:
// Compute required partition propagation of the n-th child
//
//---------------------------------------------------------------------------
CPartitionPropagationSpec *
CPhysicalPartitionSelector::PppsRequired
(
IMemoryPool *pmp,
CExpressionHandle & exprhdl,
CPartitionPropagationSpec *pppsRequired,
ULONG
#ifdef GPOS_DEBUG
ulChildIndex
#endif // GPOS_DEBUG
,
DrgPdp *, //pdrgpdpCtxt,
ULONG //ulOptReq
)
{
GPOS_ASSERT(0 == ulChildIndex);
GPOS_ASSERT(NULL != pppsRequired);
CPartIndexMap *ppimInput = pppsRequired->Ppim();
CPartFilterMap *ppfmInput = pppsRequired->Ppfm();
DrgPul *pdrgpulInputScanIds = ppimInput->PdrgpulScanIds(pmp);
CPartIndexMap *ppim = GPOS_NEW(pmp) CPartIndexMap(pmp);
CPartFilterMap *ppfm = GPOS_NEW(pmp) CPartFilterMap(pmp);
CPartInfo *ppartinfo = exprhdl.Pdprel(0)->Ppartinfo();
const ULONG ulScanIds = pdrgpulInputScanIds->UlLength();
for (ULONG ul = 0; ul < ulScanIds; ul++)
{
ULONG ulScanId = *((*pdrgpulInputScanIds)[ul]);
ULONG ulExpectedPropagators = ppimInput->UlExpectedPropagators(ulScanId);
if (ulScanId == m_ulScanId)
{
// partition propagation resolved - do not need to require from children
continue;
}
if (!ppartinfo->FContainsScanId(ulScanId) && ppartinfo->FContainsScanId(m_ulScanId))
{
// dynamic scan for the required id not defined below, but the current one is: do not push request down
continue;
}
IMDId *pmdid = ppimInput->PmdidRel(ulScanId);
DrgPpartkeys *pdrgppartkeys = ppimInput->Pdrgppartkeys(ulScanId);
PartCnstrMap *ppartcnstrmap = ppimInput->Ppartcnstrmap(ulScanId);
CPartConstraint *ppartcnstr = ppimInput->PpartcnstrRel(ulScanId);
CPartIndexMap::EPartIndexManipulator epim = ppimInput->Epim(ulScanId);
pmdid->AddRef();
pdrgppartkeys->AddRef();
ppartcnstrmap->AddRef();
ppartcnstr->AddRef();
ppim->Insert(ulScanId, ppartcnstrmap, epim, ulExpectedPropagators, pmdid, pdrgppartkeys, ppartcnstr);
(void) ppfm->FCopyPartFilter(m_pmp, ulScanId, ppfmInput);
}
// cleanup
pdrgpulInputScanIds->Release();
return GPOS_NEW(pmp) CPartitionPropagationSpec(ppim, ppfm);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalNLJoin::PppsRequiredNLJoinChild
//
// @doc:
// Compute required partition propagation of the n-th child
//
//---------------------------------------------------------------------------
CPartitionPropagationSpec *
CPhysicalNLJoin::PppsRequiredNLJoinChild
(
IMemoryPool *pmp,
CExpressionHandle &exprhdl,
CPartitionPropagationSpec *pppsRequired,
ULONG ulChildIndex,
DrgPdp *, //pdrgpdpCtxt,
ULONG ulOptReq
)
{
GPOS_ASSERT(NULL != pppsRequired);
if (1 == ulOptReq)
{
// request (1): push partition propagation requests to join's children,
// do not consider possible dynamic partition elimination using join predicate here,
// this is handled by optimization request (0) below
return CPhysical::PppsRequiredPushThruNAry(pmp, exprhdl, pppsRequired, ulChildIndex);
}
GPOS_ASSERT(0 == ulOptReq);
CPartIndexMap *ppim = pppsRequired->Ppim();
CPartFilterMap *ppfm = pppsRequired->Ppfm();
DrgPul *pdrgpul = ppim->PdrgpulScanIds(pmp);
CPartIndexMap *ppimResult = GPOS_NEW(pmp) CPartIndexMap(pmp);
CPartFilterMap *ppfmResult = GPOS_NEW(pmp) CPartFilterMap(pmp);
CPartInfo *ppartinfoOuter = exprhdl.Pdprel(0)->Ppartinfo();
CColRefSet *pcrsOutputOuter = exprhdl.Pdprel(0)->PcrsOutput();
CColRefSet *pcrsOutputInner = exprhdl.Pdprel(1)->PcrsOutput();
const ULONG ulPartIndexIds = pdrgpul->UlLength();
for (ULONG ul = 0; ul < ulPartIndexIds; ul++)
{
ULONG ulPartIndexId = *((*pdrgpul)[ul]);
if (ppfm->FContainsScanId(ulPartIndexId))
{
GPOS_ASSERT(NULL != ppfm->Pexpr(ulPartIndexId));
// a selection-based propagation request pushed from above: do not propagate any
// further as the join will reduce cardinality and thus may select more partitions
// for scanning
continue;
}
BOOL fOuterPartConsumer = ppartinfoOuter->FContainsScanId(ulPartIndexId);
// in order to find interesting join predicates that can be used for DPE,
// one side of the predicate must be the partition key, while the other side must only contain
// references from the join child that does not have the partition consumer
CColRefSet *pcrsAllowedRefs = pcrsOutputOuter;
if (fOuterPartConsumer)
{
pcrsAllowedRefs = pcrsOutputInner;
}
if (0 == ulChildIndex && fOuterPartConsumer)
{
// always push through required partition propagation for consumers on the
// outer side of the nested loop join
DrgPpartkeys *pdrgppartkeys = ppartinfoOuter->PdrgppartkeysByScanId(ulPartIndexId);
GPOS_ASSERT(NULL != pdrgppartkeys);
pdrgppartkeys->AddRef();
ppimResult->AddRequiredPartPropagation(ppim, ulPartIndexId, CPartIndexMap::EppraPreservePropagators, pdrgppartkeys);
}
else
{
// check if there is an interesting condition involving the partition key
CExpression *pexprScalar = exprhdl.PexprScalarChild(2 /*ulChildIndex*/);
AddFilterOnPartKey(pmp, true /*fNLJoin*/, pexprScalar, ppim, ppfm, ulChildIndex, ulPartIndexId, fOuterPartConsumer, ppimResult, ppfmResult, pcrsAllowedRefs);
}
}
pdrgpul->Release();
return GPOS_NEW(pmp) CPartitionPropagationSpec(ppimResult, ppfmResult);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalHashJoin::PppsRequiredCompute
//
// @doc:
// Compute required partition propagation of the n-th child
//
//---------------------------------------------------------------------------
CPartitionPropagationSpec *
CPhysicalHashJoin::PppsRequiredCompute
(
IMemoryPool *pmp,
CExpressionHandle &exprhdl,
CPartitionPropagationSpec *pppsRequired,
ULONG ulChildIndex
)
{
CPartIndexMap *ppim = pppsRequired->Ppim();
CPartFilterMap *ppfm = pppsRequired->Ppfm();
DrgPul *pdrgpul = ppim->PdrgpulScanIds(pmp);
CPartIndexMap *ppimResult = GPOS_NEW(pmp) CPartIndexMap(pmp);
CPartFilterMap *ppfmResult = GPOS_NEW(pmp) CPartFilterMap(pmp);
// get outer partition consumers
CPartInfo *ppartinfo = exprhdl.Pdprel(0)->Ppartinfo();
CColRefSet *pcrsOutputOuter = exprhdl.Pdprel(0)->PcrsOutput();
CColRefSet *pcrsOutputInner = exprhdl.Pdprel(1)->PcrsOutput();
const ULONG ulPartIndexIds = pdrgpul->UlLength();
for (ULONG ul = 0; ul < ulPartIndexIds; ul++)
{
ULONG ulPartIndexId = *((*pdrgpul)[ul]);
if (ppfm->FContainsScanId(ulPartIndexId))
{
GPOS_ASSERT(NULL != ppfm->Pexpr(ulPartIndexId));
// a selection-based propagation request pushed from above: do not propagate any
// further as the join will reduce cardinality and thus may select more partitions
// for scanning
continue;
}
BOOL fOuterPartConsumer = ppartinfo->FContainsScanId(ulPartIndexId);
// in order to find interesting join predicates that can be used for DPE,
// one side of the predicate must be the partition key, while the other side must only contain
// references from the join child that does not have the partition consumer
CColRefSet *pcrsAllowedRefs = pcrsOutputOuter;
if (fOuterPartConsumer)
{
pcrsAllowedRefs = pcrsOutputInner;
}
if (1 == ulChildIndex && !fOuterPartConsumer)
{
// always push through required partition propagation for consumers on the
// inner side of the hash join
DrgPpartkeys *pdrgppartkeys = exprhdl.Pdprel(1 /*ulChildIndex*/)->Ppartinfo()->PdrgppartkeysByScanId(ulPartIndexId);
GPOS_ASSERT(NULL != pdrgppartkeys);
pdrgppartkeys->AddRef();
ppimResult->AddRequiredPartPropagation(ppim, ulPartIndexId, CPartIndexMap::EppraPreservePropagators, pdrgppartkeys);
}
else
{
// look for a filter on the part key
CExpression *pexprScalar = exprhdl.PexprScalarChild(2 /*ulChildIndex*/);
AddFilterOnPartKey(pmp, false /*fNLJoin*/, pexprScalar, ppim, ppfm, ulChildIndex, ulPartIndexId, fOuterPartConsumer, ppimResult, ppfmResult, pcrsAllowedRefs);
}
}
pdrgpul->Release();
return GPOS_NEW(pmp) CPartitionPropagationSpec(ppimResult, ppfmResult);
}