//---------------------------------------------------------------------------
// @function:
// CLogicalConstTableGet::PstatsDerive
//
// @doc:
// Derive statistics
//
//---------------------------------------------------------------------------
IStatistics *
CLogicalConstTableGet::PstatsDerive
(
IMemoryPool *pmp,
CExpressionHandle &exprhdl,
DrgPstat * // not used
)
const
{
GPOS_ASSERT(Esp(exprhdl) > EspNone);
CReqdPropRelational *prprel = CReqdPropRelational::Prprel(exprhdl.Prp());
CColRefSet *pcrs = prprel->PcrsStat();
DrgPul *pdrgpulColIds = GPOS_NEW(pmp) DrgPul(pmp);
pcrs->ExtractColIds(pmp, pdrgpulColIds);
DrgPul *pdrgpulColWidth = CUtils::Pdrgpul(pmp, m_pdrgpcrOutput);
IStatistics *pstats = CStatistics::PstatsDummy
(
pmp,
pdrgpulColIds,
pdrgpulColWidth,
m_pdrgpdrgpdatum->UlLength()
);
// clean up
pdrgpulColIds->Release();
pdrgpulColWidth->Release();
return pstats;
}
//---------------------------------------------------------------------------
// @function:
// CLogical::PstatsDeriveDummy
//
// @doc:
// Derive dummy statistics
//
//---------------------------------------------------------------------------
IStatistics *
CLogical::PstatsDeriveDummy
(
IMemoryPool *pmp,
CExpressionHandle &exprhdl,
CDouble dRows
)
const
{
GPOS_CHECK_ABORT;
// return a dummy stats object that has a histogram for every
// required-stats column
GPOS_ASSERT(Esp(exprhdl) > EspNone);
CReqdPropRelational *prprel = CReqdPropRelational::Prprel(exprhdl.Prp());
CColRefSet *pcrs = prprel->PcrsStat();
DrgPul *pdrgpulColIds = GPOS_NEW(pmp) DrgPul(pmp);
pcrs->ExtractColIds(pmp, pdrgpulColIds);
IStatistics *pstats = CStatistics::PstatsDummy(pmp, pdrgpulColIds, dRows);
// clean up
pdrgpulColIds->Release();
return pstats;
}
//---------------------------------------------------------------------------
// @function:
// CExpressionHandle::DeriveStats
//
// @doc:
// Stat derivation using given properties and context
//
//---------------------------------------------------------------------------
void
CExpressionHandle::DeriveStats
(
IMemoryPool *pmpLocal,
IMemoryPool *pmpGlobal,
CReqdPropRelational *prprel,
DrgPstat *pdrgpstatCtxt
)
{
CReqdPropRelational *prprelNew = prprel;
if (NULL == prprelNew)
{
// create empty property container
CColRefSet *pcrs = GPOS_NEW(pmpGlobal) CColRefSet(pmpGlobal);
prprelNew = GPOS_NEW(pmpGlobal) CReqdPropRelational(pcrs);
}
else
{
prprelNew->AddRef();
}
DrgPstat *pdrgpstatCtxtNew = pdrgpstatCtxt;
if (NULL == pdrgpstatCtxt)
{
// create empty context
pdrgpstatCtxtNew = GPOS_NEW(pmpGlobal) DrgPstat(pmpGlobal);
}
else
{
pdrgpstatCtxtNew->AddRef();
}
if (NULL != Pgexpr())
{
(void) Pgexpr()->Pgroup()->PstatsRecursiveDerive(pmpLocal, pmpGlobal, prprelNew, pdrgpstatCtxtNew);
}
else
{
GPOS_ASSERT(NULL != Pexpr());
(void) Pexpr()->PstatsDerive(prprelNew, pdrgpstatCtxtNew);
}
prprelNew->Release();
pdrgpstatCtxtNew->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;
}
