//---------------------------------------------------------------------------
// @function:
// CExpressionHandle::Pop
//
// @doc:
// Get child operator from handle
//
//---------------------------------------------------------------------------
COperator *
CExpressionHandle::Pop
(
ULONG ulChildIndex
)
const
{
GPOS_ASSERT(ulChildIndex < UlArity());
if (NULL != m_pexpr)
{
GPOS_ASSERT(NULL == m_pgexpr);
return (*m_pexpr)[ulChildIndex]->Pop();
}
if (NULL != m_pcc)
{
COptimizationContext *pocChild = (*m_pcc->Pdrgpoc())[ulChildIndex];
GPOS_ASSERT(NULL != pocChild);
CCostContext *pccChild = pocChild->PccBest();
GPOS_ASSERT(NULL != pccChild);
return pccChild->Pgexpr()->Pop();
}
return NULL;
}
//---------------------------------------------------------------------------
// @function:
// COptimizationContext::PrppCTEProducer
//
// @doc:
// Compute required properties to CTE producer based on plan properties
// of CTE consumer
//
//---------------------------------------------------------------------------
CReqdPropPlan *
COptimizationContext::PrppCTEProducer
(
IMemoryPool *mp,
COptimizationContext *poc,
ULONG ulSearchStages
)
{
GPOS_ASSERT(NULL != poc);
GPOS_ASSERT(NULL != poc->PccBest());
CCostContext *pccBest = poc->PccBest();
CGroupExpression *pgexpr = pccBest->Pgexpr();
BOOL fOptimizeCTESequence =
(
COperator::EopPhysicalSequence == pgexpr->Pop()->Eopid() &&
(*pgexpr)[0]->FHasCTEProducer()
);
if (!fOptimizeCTESequence)
{
// best group expression is not a CTE sequence
return NULL;
}
COptimizationContext *pocProducer = (*pgexpr)[0]->PocLookupBest(mp, ulSearchStages, (*pccBest->Pdrgpoc())[0]->Prpp());
if (NULL == pocProducer)
{
return NULL;
}
CCostContext *pccProducer = pocProducer->PccBest();
if (NULL == pccProducer)
{
return NULL;
}
COptimizationContext *pocConsumer = (*pgexpr)[1]->PocLookupBest(mp, ulSearchStages, (*pccBest->Pdrgpoc())[1]->Prpp());
if (NULL == pocConsumer)
{
return NULL;
}
CCostContext *pccConsumer = pocConsumer->PccBest();
if (NULL == pccConsumer)
{
return NULL;
}
CColRefSet *pcrsInnerOutput = CDrvdPropRelational::GetRelationalProperties((*pgexpr)[1]->Pdp())->PcrsOutput();
CPhysicalCTEProducer *popProducer = CPhysicalCTEProducer::PopConvert(pccProducer->Pgexpr()->Pop());
UlongToColRefMap *colref_mapping = COptCtxt::PoctxtFromTLS()->Pcteinfo()->PhmulcrConsumerToProducer(mp, popProducer->UlCTEId(), pcrsInnerOutput, popProducer->Pdrgpcr());
CReqdPropPlan *prppProducer = CReqdPropPlan::PrppRemap(mp, pocProducer->Prpp(), pccConsumer->Pdpplan(), colref_mapping);
colref_mapping->Release();
if (prppProducer->Equals(pocProducer->Prpp()))
{
prppProducer->Release();
return NULL;
}
return prppProducer;
}