//---------------------------------------------------------------------------
// @function:
// CExpressionHandle::CopyCostCtxtProps
//
// @doc:
// Cache plan properties of cost context and its children on the handle
//
//---------------------------------------------------------------------------
void
CExpressionHandle::CopyCostCtxtProps()
{
GPOS_ASSERT(NULL != m_pcc);
GPOS_ASSERT(NULL == m_pdrgpdp);
GPOS_ASSERT(NULL == m_pdp);
// add-ref context properties
CDrvdProp *pdp = m_pcc->Pdpplan();
pdp->AddRef();
m_pdp = pdp;
// add-ref child group expressions' properties
const ULONG ulArity = UlArity();
m_pdrgpdp = GPOS_NEW(m_pmp) DrgPdp(m_pmp, ulArity);
for (ULONG ul = 0; ul < ulArity; ul++)
{
CGroup *pgroupChild = (*m_pgexpr)[ul];
if (!pgroupChild->FScalar())
{
COptimizationContext *pocChild = (*m_pcc->Pdrgpoc())[ul];
GPOS_ASSERT(NULL != pocChild);
CCostContext *pccChild = pocChild->PccBest();
GPOS_ASSERT(NULL != pccChild);
pdp = pccChild->Pdpplan();
pdp->AddRef();
m_pdrgpdp->Append(pdp);
}
}
}
//---------------------------------------------------------------------------
// @function:
// CLogicalInnerJoin::FFewerConj
//
// @doc:
// Compare two innerJoin group expressions, test whether the first one
// has less join predicates than the second one. This is used to
// prioritize innerJoin with less predicates for stats derivation
//
//---------------------------------------------------------------------------
BOOL
CLogicalInnerJoin::FFewerConj
(
IMemoryPool *pmp,
CGroupExpression *pgexprFst,
CGroupExpression *pgexprSnd
)
{
if (NULL == pgexprFst || NULL == pgexprSnd)
{
return false;
}
if (COperator::EopLogicalInnerJoin != pgexprFst->Pop()->Eopid() ||
COperator::EopLogicalInnerJoin != pgexprSnd->Pop()->Eopid())
{
return false;
}
// third child must be the group for join conditions
CGroup *pgroupScalarFst = (*pgexprFst)[2];
CGroup *pgroupScalarSnd = (*pgexprSnd)[2];
GPOS_ASSERT(pgroupScalarFst->FScalar());
GPOS_ASSERT(pgroupScalarSnd->FScalar());
DrgPexpr *pdrgpexprConjFst = CPredicateUtils::PdrgpexprConjuncts(pmp, pgroupScalarFst->PexprScalar());
DrgPexpr *pdrgpexprConjSnd = CPredicateUtils::PdrgpexprConjuncts(pmp, pgroupScalarSnd->PexprScalar());
ULONG ulConjFst = pdrgpexprConjFst->UlLength();
ULONG ulConjSnd = pdrgpexprConjSnd->UlLength();
pdrgpexprConjFst->Release();
pdrgpexprConjSnd->Release();
return ulConjFst < ulConjSnd;
}
