//---------------------------------------------------------------------------
// @function:
// CColumnFactory::PcrCopy
//
// @doc:
// Create a copy of the given colref
//
//---------------------------------------------------------------------------
CColRef *
CColumnFactory::PcrCopy
(
const CColRef* pcr
)
{
CName name(pcr->Name());
if (CColRef::EcrtComputed == pcr->Ecrt())
{
return PcrCreate(pcr->Pmdtype(), name);
}
GPOS_ASSERT(CColRef::EcrtTable == pcr->Ecrt());
ULONG ulId = m_aul.TIncr();
CColRefTable *pcrTable = CColRefTable::PcrConvert(const_cast<CColRef*>(pcr));
return PcrCreate
(
pcr->Pmdtype(),
pcrTable->IAttno(),
pcrTable->FNullable(),
ulId,
name,
pcrTable->UlSourceOpId(),
pcrTable->UlWidth()
);
}
//---------------------------------------------------------------------------
// @function:
// CLogicalGet::PcrsDeriveNotNull
//
// @doc:
// Derive not null output columns
//
//---------------------------------------------------------------------------
CColRefSet *
CLogicalGet::PcrsDeriveNotNull
(
IMemoryPool *pmp,
CExpressionHandle &exprhdl
)
const
{
// get all output columns
CColRefSet *pcrs = GPOS_NEW(pmp) CColRefSet(pmp);
pcrs->Include(CDrvdPropRelational::Pdprel(exprhdl.Pdp())->PcrsOutput());
// filters out nullable columns
CColRefSetIter crsi(*CDrvdPropRelational::Pdprel(exprhdl.Pdp())->PcrsOutput());
while (crsi.FAdvance())
{
CColRefTable *pcrtable = CColRefTable::PcrConvert(const_cast<CColRef*>(crsi.Pcr()));
if (pcrtable->FNullable())
{
pcrs->Exclude(pcrtable);
}
}
return pcrs;
}