//---------------------------------------------------------------------------
// @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:
// CPhysical::PppsRequiredPushThruNAry
//
// @doc:
// Helper for pushing required partition propagation to the children of
// an n-ary operator
//
//---------------------------------------------------------------------------
CPartitionPropagationSpec *
CPhysical::PppsRequiredPushThruNAry
(
IMemoryPool *mp,
CExpressionHandle &exprhdl,
CPartitionPropagationSpec *pppsReqd,
ULONG child_index
)
{
GPOS_ASSERT(NULL != pppsReqd);
CPartIndexMap *ppimReqd = pppsReqd->Ppim();
CPartFilterMap *ppfmReqd = pppsReqd->Ppfm();
ULongPtrArray *pdrgpul = ppimReqd->PdrgpulScanIds(mp);
CPartIndexMap *ppimResult = GPOS_NEW(mp) CPartIndexMap(mp);
CPartFilterMap *ppfmResult = GPOS_NEW(mp) CPartFilterMap(mp);
const ULONG ulPartIndexIds = pdrgpul->Size();
const ULONG arity = exprhdl.UlNonScalarChildren();
// iterate over required part index ids and decide which ones to push to the outer
// and which to the inner side of the n-ary op
for (ULONG ul = 0; ul < ulPartIndexIds; ul++)
{
ULONG part_idx_id = *((*pdrgpul)[ul]);
GPOS_ASSERT(ppimReqd->Contains(part_idx_id));
CBitSet *pbsPartConsumer = GPOS_NEW(mp) CBitSet(mp);
for (ULONG ulChildIdx = 0; ulChildIdx < arity; ulChildIdx++)
{
if (exprhdl.GetRelationalProperties(ulChildIdx)->Ppartinfo()->FContainsScanId(part_idx_id))
{
(void) pbsPartConsumer->ExchangeSet(ulChildIdx);
}
}
if (arity == pbsPartConsumer->Size() &&
COperator::EopPhysicalSequence == exprhdl.Pop()->Eopid() &&
(*(exprhdl.Pgexpr()))[0]->FHasCTEProducer())
{
GPOS_ASSERT(2 == arity);
// this is a part index id that comes from both sides of a sequence
// with a CTE producer on the outer side, so pretend that part index
// id is not defined the inner sides
pbsPartConsumer->ExchangeClear(1);
}
if (!FCanPushPartReqToChild(pbsPartConsumer, child_index))
{
// clean up
pbsPartConsumer->Release();
continue;
}
// clean up
pbsPartConsumer->Release();
CPartKeysArray *pdrgppartkeys = exprhdl.GetRelationalProperties(child_index)->Ppartinfo()->PdrgppartkeysByScanId(part_idx_id);
GPOS_ASSERT(NULL != pdrgppartkeys);
pdrgppartkeys->AddRef();
// push requirements to child node
ppimResult->AddRequiredPartPropagation(ppimReqd, part_idx_id, CPartIndexMap::EppraPreservePropagators, pdrgppartkeys);
// check if there is a filter on the part index id and propagate that further down
if (ppfmReqd->FContainsScanId(part_idx_id))
{
CExpression *pexpr = ppfmReqd->Pexpr(part_idx_id);
// if the current child is inner child and the predicate is IsNull check and the parent is outer join,
// don't push IsNull check predicate to the partition filter.
// for all the other cases, push the filter down.
if (!(1 == child_index &&
CUtils::FScalarNullTest(pexpr) &&
CUtils::FPhysicalOuterJoin(exprhdl.Pop()))
)
{
pexpr->AddRef();
ppfmResult->AddPartFilter(mp, part_idx_id, pexpr, NULL /*stats */);
}
}
}
pdrgpul->Release();
return GPOS_NEW(mp) 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);
}
