//---------------------------------------------------------------------------
// @function:
// CPhysicalPartitionSelector::PpfmDerive
//
// @doc:
// Derive partition filter map
//
//---------------------------------------------------------------------------
CPartFilterMap *
CPhysicalPartitionSelector::PpfmDerive
(
IMemoryPool *mp,
CExpressionHandle &exprhdl
)
const
{
if (!FHasFilter())
{
return PpfmPassThruOuter(exprhdl);
}
CPartFilterMap *ppfm = PpfmDeriveCombineRelational(mp, exprhdl);
IStatistics *stats = exprhdl.Pstats();
GPOS_ASSERT(NULL != stats);
m_pexprCombinedPredicate->AddRef();
stats->AddRef();
ppfm->AddPartFilter(mp, m_scan_id, m_pexprCombinedPredicate, stats);
return ppfm;
}
//---------------------------------------------------------------------------
// @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);
}