//---------------------------------------------------------------------------
// @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:
// CLogicalConstTableGet::PdrgpcoldescMapping
//
// @doc:
// Construct column descriptors from column references
//
//---------------------------------------------------------------------------
DrgPcoldesc *
CLogicalConstTableGet::PdrgpcoldescMapping
(
IMemoryPool *pmp,
DrgPcr *pdrgpcr
)
const
{
GPOS_ASSERT(NULL != pdrgpcr);
DrgPcoldesc *pdrgpcoldesc = GPOS_NEW(pmp) DrgPcoldesc(pmp);
const ULONG ulLen = pdrgpcr->UlLength();
for (ULONG ul = 0; ul < ulLen; ul++)
{
CColRef *pcr = (*pdrgpcr)[ul];
ULONG ulLength = ULONG_MAX;
if (CColRef::EcrtTable == pcr->Ecrt())
{
CColRefTable *pcrTable = CColRefTable::PcrConvert(pcr);
ulLength = pcrTable->UlWidth();
}
CColumnDescriptor *pcoldesc = GPOS_NEW(pmp) CColumnDescriptor
(
pmp,
pcr->Pmdtype(),
pcr->Name(),
ul + 1, //iAttno
true, // FNullable
ulLength
);
pdrgpcoldesc->Append(pcoldesc);
}
return pdrgpcoldesc;
}