//---------------------------------------------------------------------------
// @function:
// CJobTransformation::EevtTransform
//
// @doc:
// Apply transformation action
//
//---------------------------------------------------------------------------
CJobTransformation::EEvent
CJobTransformation::EevtTransform
(
CSchedulerContext *psc,
CJob *pjOwner
)
{
// get a job pointer
CJobTransformation *pjt = PjConvert(pjOwner);
IMemoryPool *pmpGlobal = psc->PmpGlobal();
IMemoryPool *pmpLocal = psc->PmpLocal();
CGroupExpression *pgexpr = pjt->m_pgexpr;
CXform *pxform = pjt->m_pxform;
// insert transformation results to memo
CXformResult *pxfres = GPOS_NEW(pmpGlobal) CXformResult(pmpGlobal);
ULONG ulElapsedTime = 0;
pgexpr->Transform(pmpGlobal, pmpLocal, pxform, pxfres, &ulElapsedTime);
psc->Peng()->InsertXformResult(pgexpr->Pgroup(), pxfres, pxform->Exfid(), pgexpr, ulElapsedTime);
pxfres->Release();
return eevCompleted;
}
//---------------------------------------------------------------------------
// @function:
// CExpressionHandle::PexprScalarChild
//
// @doc:
// Get the scalar child at given index
//
//---------------------------------------------------------------------------
CExpression *
CExpressionHandle::PexprScalarChild
(
ULONG ulChildIndex
)
const
{
GPOS_ASSERT(ulChildIndex < UlArity());
if (NULL != m_pgexpr)
{
// access scalar expression cached on the child scalar group
GPOS_ASSERT((*m_pgexpr)[ulChildIndex]->FScalar());
CExpression *pexprScalar = (*m_pgexpr)[ulChildIndex]->PexprScalar();
GPOS_ASSERT_IMP(NULL == pexprScalar, CDrvdPropScalar::Pdpscalar((*m_pgexpr)[ulChildIndex]->Pdp())->FHasSubquery());
return pexprScalar;
}
if (NULL != m_pexpr && NULL != (*m_pexpr)[ulChildIndex]->Pgexpr())
{
// if the expression does not come from a group, but its child does then
// get the scalar child from that group
CGroupExpression *pgexpr = (*m_pexpr)[ulChildIndex]->Pgexpr();
CExpression *pexprScalar = pgexpr->Pgroup()->PexprScalar();
GPOS_ASSERT_IMP(NULL == pexprScalar, CDrvdPropScalar::Pdpscalar((*m_pexpr)[ulChildIndex]->PdpDerive())->FHasSubquery());
return pexprScalar;
}
// access scalar expression from the child expression node
GPOS_ASSERT((*m_pexpr)[ulChildIndex]->Pop()->FScalar());
return (*m_pexpr)[ulChildIndex];
}
