//---------------------------------------------------------------------------
// @function:
// CLogicalConstTableGet::FMatch
//
// @doc:
// Match function on operator level
//
//---------------------------------------------------------------------------
BOOL
CLogicalConstTableGet::FMatch
(
COperator *pop
)
const
{
if (pop->Eopid() != Eopid())
{
return false;
}
CLogicalConstTableGet *popCTG = CLogicalConstTableGet::PopConvert(pop);
// match if column descriptors, const values and output columns are identical
return m_pdrgpcoldesc->FEqual(popCTG->Pdrgpcoldesc()) &&
m_pdrgpdrgpdatum->FEqual(popCTG->Pdrgpdrgpdatum()) &&
m_pdrgpcrOutput->FEqual(popCTG->PdrgpcrOutput());
}
//---------------------------------------------------------------------------
// @function:
// CXformImplementConstTableGet::Transform
//
// @doc:
// Actual transformation
//
//---------------------------------------------------------------------------
void
CXformImplementConstTableGet::Transform
(
CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr
)
const
{
GPOS_ASSERT(NULL != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalConstTableGet *popConstTableGet = CLogicalConstTableGet::PopConvert(pexpr->Pop());
IMemoryPool *mp = pxfctxt->Pmp();
// create/extract components for alternative
CColumnDescriptorArray *pdrgpcoldesc = popConstTableGet->Pdrgpcoldesc();
pdrgpcoldesc->AddRef();
IDatum2dArray *pdrgpdrgpdatum = popConstTableGet->Pdrgpdrgpdatum();
pdrgpdrgpdatum->AddRef();
CColRefArray *pdrgpcrOutput = popConstTableGet->PdrgpcrOutput();
pdrgpcrOutput->AddRef();
// create alternative expression
CExpression *pexprAlt =
GPOS_NEW(mp) CExpression
(
mp,
GPOS_NEW(mp) CPhysicalConstTableGet(mp, pdrgpcoldesc, pdrgpdrgpdatum, pdrgpcrOutput)
);
// add alternative to transformation result
pxfres->Add(pexprAlt);
}
