//---------------------------------------------------------------------------
// @function:
// CLogicalTVF::CLogicalTVF
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CLogicalTVF::CLogicalTVF
(
IMemoryPool *pmp,
IMDId *pmdidFunc,
IMDId *pmdidRetType,
CWStringConst *pstr,
DrgPcoldesc *pdrgpcoldesc,
DrgPcr *pdrgpcrOutput
)
:
CLogical(pmp),
m_pmdidFunc(pmdidFunc),
m_pmdidRetType(pmdidRetType),
m_pstr(pstr),
m_pdrgpcoldesc(pdrgpcoldesc),
m_pdrgpcrOutput(pdrgpcrOutput)
{
GPOS_ASSERT(pmdidFunc->FValid());
GPOS_ASSERT(pmdidRetType->FValid());
GPOS_ASSERT(NULL != pstr);
GPOS_ASSERT(NULL != pdrgpcoldesc);
GPOS_ASSERT(NULL != pdrgpcrOutput);
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
const IMDFunction *pmdfunc = pmda->Pmdfunc(m_pmdidFunc);
m_efs = pmdfunc->EfsStability();
m_efda = pmdfunc->EfdaDataAccess();
m_fReturnsSet = pmdfunc->FReturnsSet();
}
//---------------------------------------------------------------------------
// @function:
// CScalarAggFunc::PmdidLookupReturnType
//
// @doc:
// Lookup mdid of return type for given Agg function
//
//---------------------------------------------------------------------------
IMDId *
CScalarAggFunc::PmdidLookupReturnType
(
IMDId *pmdidAggFunc,
BOOL fGlobal,
CMDAccessor *pmdaInput
)
{
GPOS_ASSERT(NULL != pmdidAggFunc);
CMDAccessor *pmda = pmdaInput;
if (NULL == pmda)
{
pmda = COptCtxt::PoctxtFromTLS()->Pmda();
}
GPOS_ASSERT(NULL != pmda);
// get aggregate function return type from the MD cache
const IMDAggregate *pmdagg = pmda->Pmdagg(pmdidAggFunc);
if (fGlobal)
{
return pmdagg->PmdidTypeResult();
}
return pmdagg->PmdidTypeIntermediate();
}
//---------------------------------------------------------------------------
// @function:
// CLogicalTVF::CLogicalTVF
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CLogicalTVF::CLogicalTVF
(
IMemoryPool *pmp,
IMDId *pmdidFunc,
IMDId *pmdidRetType,
CWStringConst *pstr,
DrgPcoldesc *pdrgpcoldesc
)
:
CLogical(pmp),
m_pmdidFunc(pmdidFunc),
m_pmdidRetType(pmdidRetType),
m_pstr(pstr),
m_pdrgpcoldesc(pdrgpcoldesc),
m_pdrgpcrOutput(NULL)
{
GPOS_ASSERT(pmdidFunc->FValid());
GPOS_ASSERT(pmdidRetType->FValid());
GPOS_ASSERT(NULL != pstr);
GPOS_ASSERT(NULL != pdrgpcoldesc);
// generate a default column set for the list of column descriptors
m_pdrgpcrOutput = PdrgpcrCreateMapping(pmp, pdrgpcoldesc, UlOpId());
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
const IMDFunction *pmdfunc = pmda->Pmdfunc(m_pmdidFunc);
m_efs = pmdfunc->EfsStability();
m_efda = pmdfunc->EfdaDataAccess();
m_fReturnsSet = pmdfunc->FReturnsSet();
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalTVF::CPhysicalTVF
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CPhysicalTVF::CPhysicalTVF
(
IMemoryPool *pmp,
IMDId *pmdidFunc,
IMDId *pmdidRetType,
CWStringConst *pstr,
DrgPcoldesc *pdrgpcoldesc,
CColRefSet *pcrsOutput
)
:
CPhysical(pmp),
m_pmdidFunc(pmdidFunc),
m_pmdidRetType(pmdidRetType),
m_pstr(pstr),
m_pdrgpcoldesc(pdrgpcoldesc),
m_pcrsOutput(pcrsOutput)
{
GPOS_ASSERT(m_pmdidFunc->FValid());
GPOS_ASSERT(m_pmdidRetType->FValid());
GPOS_ASSERT(NULL != m_pstr);
GPOS_ASSERT(NULL != m_pdrgpcoldesc);
GPOS_ASSERT(NULL != m_pcrsOutput);
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
m_pmdfunc = pmda->Pmdfunc(m_pmdidFunc);
}
//---------------------------------------------------------------------------
// @function:
// CScalarOp::PmdidType
//
// @doc:
// Expression type
//
//---------------------------------------------------------------------------
IMDId *
CScalarOp::PmdidType() const
{
if (NULL != m_pmdidReturnType)
{
return m_pmdidReturnType;
}
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
return pmda->Pmdscop(m_pmdidOp)->PmdidTypeResult();
}
//---------------------------------------------------------------------------
// @function:
// CStatsPredUtils::Estatscmpt
//
// @doc:
// For the purpose of statistics computation, what is the comparison
// type of an operator. Note that this has different, looser semantics
// than CUtils::Ecmpt
//
//---------------------------------------------------------------------------
CStatsPred::EStatsCmpType
CStatsPredUtils::Estatscmpt
(
IMDId *pmdid
)
{
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
const IMDScalarOp *pmdscop = pmda->Pmdscop(pmdid);
// Simply go by operator name.
// If the name of the operator is "<", then it is a LessThan etc.
const CWStringConst *pstrOpName = pmdscop->Mdname().Pstr();
return Estatscmpt(pstrOpName);
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalScan::ComputeTableStats
//
// @doc:
// Compute stats of underlying table
//
//---------------------------------------------------------------------------
void
CPhysicalScan::ComputeTableStats
(
IMemoryPool *pmp
)
{
GPOS_ASSERT(NULL == m_pstatsBaseTable);
CColRefSet *pcrsHist = GPOS_NEW(pmp) CColRefSet(pmp, m_pdrgpcrOutput);
CColRefSet *pcrsWidth = GPOS_NEW(pmp) CColRefSet(pmp);
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
m_pstatsBaseTable = pmda->Pstats(pmp, m_ptabdesc->Pmdid(), pcrsHist, pcrsWidth);
GPOS_ASSERT(NULL != m_pstatsBaseTable);
pcrsHist->Release();
pcrsWidth->Release();
}
//---------------------------------------------------------------------------
// @function:
// CLogical::PstatsBaseTable
//
// @doc:
// Helper for deriving statistics on a base table
//
//---------------------------------------------------------------------------
IStatistics *
CLogical::PstatsBaseTable
(
IMemoryPool *pmp,
CExpressionHandle &exprhdl,
CTableDescriptor *ptabdesc,
CColRefSet *pcrsHistExtra // additional columns required for stats, not required by parent
)
{
CReqdPropRelational *prprel = CReqdPropRelational::Prprel(exprhdl.Prp());
CColRefSet *pcrsHist = GPOS_NEW(pmp) CColRefSet(pmp);
pcrsHist->Include(prprel->PcrsStat());
if (NULL != pcrsHistExtra)
{
pcrsHist->Include(pcrsHistExtra);
}
CDrvdPropRelational *pdprel = exprhdl.Pdprel();
CColRefSet *pcrsOutput = pdprel->PcrsOutput();
CColRefSet *pcrsWidth = GPOS_NEW(pmp) CColRefSet(pmp);
pcrsWidth->Include(pcrsOutput);
pcrsWidth->Exclude(pcrsHist);
const COptCtxt *poctxt = COptCtxt::PoctxtFromTLS();
CMDAccessor *pmda = poctxt->Pmda();
CStatisticsConfig *pstatsconf = poctxt->Poconf()->Pstatsconf();
IStatistics *pstats = pmda->Pstats
(
pmp,
ptabdesc->Pmdid(),
pcrsHist,
pcrsWidth,
pstatsconf
);
// clean up
pcrsWidth->Release();
pcrsHist->Release();
return pstats;
}
//---------------------------------------------------------------------------
// @function:
// CLogical::PstatsBaseTable
//
// @doc:
// Helper for deriving statistics on a base table
//
//---------------------------------------------------------------------------
IStatistics *
CLogical::PstatsBaseTable
(
IMemoryPool *pmp,
CExpressionHandle &exprhdl,
CTableDescriptor *ptabdesc,
CColRefSet *pcrsStatExtra // additional columns required for stats, not required by parent
)
{
// extract colids and attribute for which detailed stats are necessary
CReqdPropRelational *prprel = CReqdPropRelational::Prprel(exprhdl.Prp());
CColRefSet *pcrsStat = GPOS_NEW(pmp) CColRefSet(pmp);
pcrsStat->Include(prprel->PcrsStat());
if (NULL != pcrsStatExtra)
{
pcrsStat->Include(pcrsStatExtra);
}
DrgPul *pdrgpulHistColIds = GPOS_NEW(pmp) DrgPul(pmp);
DrgPul *pdrgpulHistPos = GPOS_NEW(pmp) DrgPul(pmp);
CUtils::ExtractColIdsAttno(pmp, ptabdesc, pcrsStat, pdrgpulHistColIds, pdrgpulHistPos);
// extract colids and attribute for which widths are necessary
CDrvdPropRelational *pdprel = exprhdl.Pdprel();
CColRefSet *pcrsWidth = pdprel->PcrsOutput();
DrgPul *pdrgpulWidthColIds = GPOS_NEW(pmp) DrgPul(pmp);
DrgPul *pdrgpulWidthPos = GPOS_NEW(pmp) DrgPul(pmp);
CUtils::ExtractColIdsAttno(pmp, ptabdesc, pcrsWidth, pdrgpulWidthColIds, pdrgpulWidthPos);
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
IStatistics *pstats = pmda->Pstats(pmp, ptabdesc->Pmdid(), pdrgpulHistPos, pdrgpulHistColIds, pdrgpulWidthPos, pdrgpulWidthColIds);
if (!GPOS_FTRACE(EopttraceDonotCollectMissingStatsCols) && !pstats->FEmpty())
{
CStatisticsUtils::RecordMissingStatisticsColumns(pmp, ptabdesc, pcrsStat, pstats);
}
pcrsStat->Release();
return pstats;
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalJoin::FHashJoinCompatible
//
// @doc:
// Are the given predicate parts hash join compatible?
// predicate parts are obtained by splitting equality into outer
// and inner expressions
//
//---------------------------------------------------------------------------
BOOL
CPhysicalJoin::FHashJoinCompatible
(
CExpression *pexprOuter, // outer child of the join
CExpression* pexprInner, // inner child of the join
CExpression *pexprPredOuter,// outer part of join predicate
CExpression *pexprPredInner // inner part of join predicate
)
{
GPOS_ASSERT(NULL != pexprOuter);
GPOS_ASSERT(NULL != pexprInner);
GPOS_ASSERT(NULL != pexprPredOuter);
GPOS_ASSERT(NULL != pexprPredInner);
IMDId *pmdidTypeOuter = CScalar::PopConvert(pexprPredOuter->Pop())->PmdidType();
IMDId *pmdidTypeInner = CScalar::PopConvert(pexprPredInner->Pop())->PmdidType();
CColRefSet *pcrsUsedPredOuter = CDrvdPropScalar::Pdpscalar(pexprPredOuter->PdpDerive())->PcrsUsed();
CColRefSet *pcrsUsedPredInner = CDrvdPropScalar::Pdpscalar(pexprPredInner->PdpDerive())->PcrsUsed();
CColRefSet *pcrsOuter = CDrvdPropRelational::Pdprel(pexprOuter->Pdp(CDrvdProp::EptRelational))->PcrsOutput();
CColRefSet *pcrsInner = CDrvdPropRelational::Pdprel(pexprInner->Pdp(CDrvdProp::EptRelational))->PcrsOutput();
// make sure that each predicate child uses columns from a different join child
// in order to reject predicates of the form 'X Join Y on f(X.a, Y.b) = 5'
BOOL fPredOuterUsesJoinOuterChild = (0 < pcrsUsedPredOuter->CElements()) && pcrsOuter->FSubset(pcrsUsedPredOuter);
BOOL fPredOuterUsesJoinInnerChild = (0 < pcrsUsedPredOuter->CElements()) && pcrsInner->FSubset(pcrsUsedPredOuter);
BOOL fPredInnerUsesJoinOuterChild = (0 < pcrsUsedPredInner->CElements()) && pcrsOuter->FSubset(pcrsUsedPredInner);
BOOL fPredInnerUsesJoinInnerChild = (0 < pcrsUsedPredInner->CElements()) && pcrsInner->FSubset(pcrsUsedPredInner);
BOOL fHashJoinCompatiblePred =
(fPredOuterUsesJoinOuterChild && fPredInnerUsesJoinInnerChild) ||
(fPredOuterUsesJoinInnerChild && fPredInnerUsesJoinOuterChild);
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
return fHashJoinCompatiblePred &&
pmda->Pmdtype(pmdidTypeOuter)->FHashable() &&
pmda->Pmdtype(pmdidTypeInner)->FHashable();
}
//---------------------------------------------------------------------------
// @function:
// CScalarCast::CScalarCast
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CScalarCast::CScalarCast
(
IMemoryPool *pmp,
IMDId *pmdidReturnType,
IMDId *pmdidFunc,
BOOL fBinaryCoercible
)
:
CScalar(pmp),
m_pmdidReturnType(pmdidReturnType),
m_pmdidFunc(pmdidFunc),
m_fBinaryCoercible(fBinaryCoercible),
m_fReturnsNullOnNullInput(false),
m_fBoolReturnType(false)
{
if (NULL != m_pmdidFunc && m_pmdidFunc->FValid())
{
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
const IMDFunction *pmdfunc = pmda->Pmdfunc(m_pmdidFunc);
m_fReturnsNullOnNullInput = pmdfunc->FStrict();
m_fBoolReturnType = CMDAccessorUtils::FBoolType(pmda, m_pmdidReturnType);
}
}
//---------------------------------------------------------------------------
// @function:
// CScalarWindowFunc::CScalarWindowFunc
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CScalarWindowFunc::CScalarWindowFunc
(
IMemoryPool *pmp,
IMDId *pmdidFunc,
IMDId *pmdidRetType,
const CWStringConst *pstrFunc,
EWinStage ewinstage,
BOOL fDistinct
)
:
CScalarFunc(pmp),
m_ewinstage(ewinstage),
m_fDistinct(fDistinct),
m_fAgg(false)
{
GPOS_ASSERT(pmdidFunc->FValid());
GPOS_ASSERT(pmdidRetType->FValid());
m_pmdidFunc = pmdidFunc;
m_pmdidRetType = pmdidRetType;
m_pstrFunc = pstrFunc;
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
m_fAgg = pmda->FAggWindowFunc(m_pmdidFunc);
if (!m_fAgg)
{
const IMDFunction *pmdfunc = pmda->Pmdfunc(m_pmdidFunc);
m_efs = pmdfunc->EfsStability();
m_efda = pmdfunc->EfdaDataAccess();
}
else
{
// TODO: , Aug 15, 2012; pull out properties of aggregate functions
m_efs = IMDFunction::EfsImmutable;
m_efda = IMDFunction::EfdaNoSQL;
}
}
//---------------------------------------------------------------------------
// @function:
// CXformSelect2PartialDynamicIndexGet::Transform
//
// @doc:
// Actual transformation
//
//---------------------------------------------------------------------------
void
CXformSelect2PartialDynamicIndexGet::Transform
(
CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr
)
const
{
GPOS_ASSERT(NULL != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
IMemoryPool *pmp = pxfctxt->Pmp();
// extract components
CExpression *pexprRelational = (*pexpr)[0];
CExpression *pexprScalar = (*pexpr)[1];
// get the indexes on this relation
CLogicalDynamicGet *popGet = CLogicalDynamicGet::PopConvert(pexprRelational->Pop());
if (popGet->FPartial())
{
// already a partial dynamic get; do not try to split further
return;
}
CTableDescriptor *ptabdesc = popGet->Ptabdesc();
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
const IMDRelation *pmdrel = pmda->Pmdrel(ptabdesc->Pmdid());
const ULONG ulIndices = pmdrel->UlIndices();
if (0 == ulIndices)
{
// no indexes on the table
return;
}
// array of expressions in the scalar expression
DrgPexpr *pdrgpexpr = CPredicateUtils::PdrgpexprConjuncts(pmp, pexprScalar);
GPOS_ASSERT(0 < pdrgpexpr->UlLength());
// derive the scalar and relational properties to build set of required columns
CColRefSet *pcrsOutput = CDrvdPropRelational::Pdprel(pexpr->PdpDerive())->PcrsOutput();
CColRefSet *pcrsScalarExpr = CDrvdPropScalar::Pdpscalar(pexprScalar->PdpDerive())->PcrsUsed();
CColRefSet *pcrsReqd = GPOS_NEW(pmp) CColRefSet(pmp);
pcrsReqd->Include(pcrsOutput);
pcrsReqd->Include(pcrsScalarExpr);
CPartConstraint *ppartcnstr = popGet->Ppartcnstr();
ppartcnstr->AddRef();
// find a candidate set of partial index combinations
DrgPdrgPpartdig *pdrgpdrgppartdig = CXformUtils::PdrgpdrgppartdigCandidates
(
pmp,
pmda,
pdrgpexpr,
popGet->PdrgpdrgpcrPart(),
pmdrel,
ppartcnstr,
popGet->PdrgpcrOutput(),
pcrsReqd,
pcrsScalarExpr,
NULL // pcrsAcceptedOuterRefs
);
// construct alternative partial index scan plans
const ULONG ulCandidates = pdrgpdrgppartdig->UlLength();
for (ULONG ul = 0; ul < ulCandidates; ul++)
{
DrgPpartdig *pdrgppartdig = (*pdrgpdrgppartdig)[ul];
CreatePartialIndexGetPlan(pmp, pexpr, pdrgppartdig, pmdrel, pxfres);
}
ppartcnstr->Release();
pcrsReqd->Release();
pdrgpexpr->Release();
pdrgpdrgppartdig->Release();
}
//---------------------------------------------------------------------------
// @function:
// CLogical::PpcDeriveConstraintFromTable
//
// @doc:
// Derive constraint property from a table/index get
//
//---------------------------------------------------------------------------
CPropConstraint *
CLogical::PpcDeriveConstraintFromTable
(
IMemoryPool *pmp,
const CTableDescriptor *ptabdesc,
const DrgPcr *pdrgpcrOutput
)
{
DrgPcrs *pdrgpcrs = GPOS_NEW(pmp) DrgPcrs(pmp);
DrgPcnstr *pdrgpcnstr = GPOS_NEW(pmp) DrgPcnstr(pmp);
const DrgPcoldesc *pdrgpcoldesc = ptabdesc->Pdrgpcoldesc();
const ULONG ulCols = pdrgpcoldesc->UlLength();
DrgPcr *pdrgpcrNonSystem = GPOS_NEW(pmp) DrgPcr(pmp);
for (ULONG ul = 0; ul < ulCols; ul++)
{
CColumnDescriptor *pcoldesc = (*pdrgpcoldesc)[ul];
CColRef *pcr = (*pdrgpcrOutput)[ul];
// we are only interested in non-system columns that are defined as
// being NOT NULL
if (pcoldesc->FSystemColumn())
{
continue;
}
pdrgpcrNonSystem->Append(pcr);
if (pcoldesc->FNullable())
{
continue;
}
// add a "not null" constraint and an equivalence class
CConstraint * pcnstr = CConstraintInterval::PciUnbounded(pmp, pcr, false /*fIncludesNull*/);
if (pcnstr == NULL)
{
continue;
}
pdrgpcnstr->Append(pcnstr);
CColRefSet *pcrsEquiv = GPOS_NEW(pmp) CColRefSet(pmp);
pcrsEquiv->Include(pcr);
pdrgpcrs->Append(pcrsEquiv);
}
CMDAccessor *pmda = COptCtxt::PoctxtFromTLS()->Pmda();
const IMDRelation *pmdrel = pmda->Pmdrel(ptabdesc->Pmdid());
const ULONG ulCheckConstraint = pmdrel->UlCheckConstraints();
for (ULONG ul = 0; ul < ulCheckConstraint; ul++)
{
IMDId *pmdidCheckConstraint = pmdrel->PmdidCheckConstraint(ul);
const IMDCheckConstraint *pmdCheckConstraint = pmda->Pmdcheckconstraint(pmdidCheckConstraint);
// extract the check constraint expression
CExpression *pexprCheckConstraint = pmdCheckConstraint->Pexpr(pmp, pmda, pdrgpcrNonSystem);
GPOS_ASSERT(NULL != pexprCheckConstraint);
GPOS_ASSERT(CUtils::FPredicate(pexprCheckConstraint));
DrgPcrs *pdrgpcrsChild = NULL;
CConstraint *pcnstr = CConstraint::PcnstrFromScalarExpr(pmp, pexprCheckConstraint, &pdrgpcrsChild);
if (NULL != pcnstr)
{
pdrgpcnstr->Append(pcnstr);
// merge with the equivalence classes we have so far
DrgPcrs *pdrgpcrsMerged = CUtils::PdrgpcrsMergeEquivClasses(pmp, pdrgpcrs, pdrgpcrsChild);
pdrgpcrs->Release();
pdrgpcrs = pdrgpcrsMerged;
}
CRefCount::SafeRelease(pdrgpcrsChild);
pexprCheckConstraint->Release();
}
pdrgpcrNonSystem->Release();
return GPOS_NEW(pmp) CPropConstraint(pmp, pdrgpcrs, CConstraint::PcnstrConjunction(pmp, pdrgpcnstr));
}
