greenplumn CCTEInfo 源码

  • 2022-08-18
  • 浏览 (135)

greenplumn CCTEInfo 代码

文件路径:/src/backend/gporca/libgpopt/src/base/CCTEInfo.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2009 Greenplum, Inc.
//
//	@filename:
//		CCTEInfo.cpp
//
//	@doc:
//		Information about CTEs in a query
//---------------------------------------------------------------------------

#include "gpopt/base/CCTEInfo.h"

#include "gpos/base.h"

#include "gpopt/base/CCTEReq.h"
#include "gpopt/base/CColRefSetIter.h"
#include "gpopt/base/CQueryContext.h"
#include "gpopt/operators/CExpressionPreprocessor.h"
#include "gpopt/operators/CLogicalCTEConsumer.h"
#include "gpopt/operators/CLogicalCTEProducer.h"


using namespace gpopt;

//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::CCTEInfoEntry::CCTEInfoEntry
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CCTEInfo::CCTEInfoEntry::CCTEInfoEntry(CMemoryPool *mp,
									   CExpression *pexprCTEProducer)
	: m_mp(mp),
	  m_pexprCTEProducer(pexprCTEProducer),
	  m_phmcrulConsumers(nullptr),
	  m_fUsed(true)
{
	GPOS_ASSERT(nullptr != mp);
	GPOS_ASSERT(nullptr != pexprCTEProducer);

	m_phmcrulConsumers = GPOS_NEW(mp) ColRefToUlongMap(mp);
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::CCTEInfoEntry::CCTEInfoEntry
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CCTEInfo::CCTEInfoEntry::CCTEInfoEntry(CMemoryPool *mp,
									   CExpression *pexprCTEProducer,
									   BOOL fUsed)
	: m_mp(mp),
	  m_pexprCTEProducer(pexprCTEProducer),
	  m_phmcrulConsumers(nullptr),
	  m_fUsed(fUsed)
{
	GPOS_ASSERT(nullptr != mp);
	GPOS_ASSERT(nullptr != pexprCTEProducer);

	m_phmcrulConsumers = GPOS_NEW(mp) ColRefToUlongMap(mp);
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::CCTEInfoEntry::~CCTEInfoEntry
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------
CCTEInfo::CCTEInfoEntry::~CCTEInfoEntry()
{
	m_pexprCTEProducer->Release();
	m_phmcrulConsumers->Release();
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::CCTEInfoEntry::AddConsumerCols
//
//	@doc:
//		Add given columns to consumers column map
//
//---------------------------------------------------------------------------
void
CCTEInfo::CCTEInfoEntry::AddConsumerCols(CColRefArray *colref_array)
{
	GPOS_ASSERT(nullptr != colref_array);

	const ULONG size = colref_array->Size();
	for (ULONG ul = 0; ul < size; ul++)
	{
		CColRef *colref = (*colref_array)[ul];
		if (nullptr == m_phmcrulConsumers->Find(colref))
		{
			BOOL fSuccess GPOS_ASSERTS_ONLY =
				m_phmcrulConsumers->Insert(colref, GPOS_NEW(m_mp) ULONG(ul));
			GPOS_ASSERT(fSuccess);
		}
	}
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::CCTEInfoEntry::UlConsumerColPos
//
//	@doc:
//		Return position of given consumer column,
//		return gpos::ulong_max if column is not found in local map
//
//---------------------------------------------------------------------------
ULONG
CCTEInfo::CCTEInfoEntry::UlConsumerColPos(CColRef *colref)
{
	GPOS_ASSERT(nullptr != colref);

	ULONG *pul = m_phmcrulConsumers->Find(colref);
	if (nullptr == pul)
	{
		return gpos::ulong_max;
	}

	return *pul;
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::CCTEInfoEntry::UlCTEId
//
//	@doc:
//		CTE id
//
//---------------------------------------------------------------------------
ULONG
CCTEInfo::CCTEInfoEntry::UlCTEId() const
{
	return CLogicalCTEProducer::PopConvert(m_pexprCTEProducer->Pop())
		->UlCTEId();
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::CCTEInfo
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CCTEInfo::CCTEInfo(CMemoryPool *mp)
	: m_mp(mp),
	  m_phmulcteinfoentry(nullptr),
	  m_ulNextCTEId(0),
	  m_fEnableInlining(true)
{
	GPOS_ASSERT(nullptr != mp);
	m_phmulcteinfoentry = GPOS_NEW(m_mp) UlongToCTEInfoEntryMap(m_mp);
	m_phmulprodconsmap = GPOS_NEW(m_mp) UlongToProducerConsumerMap(m_mp);
}

//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::~CCTEInfo
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------
CCTEInfo::~CCTEInfo()
{
	CRefCount::SafeRelease(m_phmulcteinfoentry);
	CRefCount::SafeRelease(m_phmulprodconsmap);
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::PreprocessCTEProducer
//
//	@doc:
//		Preprocess CTE producer expression
//
//---------------------------------------------------------------------------
CExpression *
CCTEInfo::PexprPreprocessCTEProducer(const CExpression *pexprCTEProducer)
{
	GPOS_ASSERT(nullptr != pexprCTEProducer);

	CExpression *pexprProducerChild = (*pexprCTEProducer)[0];

	// get cte output cols for preprocessing use
	CColRefSet *pcrsOutput =
		CLogicalCTEProducer::PopConvert(pexprCTEProducer->Pop())
			->DeriveOutputColumns();

	CExpression *pexprChildPreprocessed =
		CExpressionPreprocessor::PexprPreprocess(m_mp, pexprProducerChild,
												 pcrsOutput);

	COperator *pop = pexprCTEProducer->Pop();
	pop->AddRef();

	CExpression *pexprProducerPreprocessed =
		GPOS_NEW(m_mp) CExpression(m_mp, pop, pexprChildPreprocessed);

	pexprProducerPreprocessed->ResetStats();
	InitDefaultStats(pexprProducerPreprocessed);

	return pexprProducerPreprocessed;
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::AddCTEProducer
//
//	@doc:
//		Add CTE producer to hashmap
//
//---------------------------------------------------------------------------
void
CCTEInfo::AddCTEProducer(CExpression *pexprCTEProducer)
{
	CExpression *pexprProducerToAdd =
		PexprPreprocessCTEProducer(pexprCTEProducer);

	COperator *pop = pexprCTEProducer->Pop();
	ULONG ulCTEId = CLogicalCTEProducer::PopConvert(pop)->UlCTEId();

	BOOL fInserted GPOS_ASSERTS_ONLY = m_phmulcteinfoentry->Insert(
		GPOS_NEW(m_mp) ULONG(ulCTEId),
		GPOS_NEW(m_mp) CCTEInfoEntry(m_mp, pexprProducerToAdd));
	GPOS_ASSERT(fInserted);
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::ReplaceCTEProducer
//
//	@doc:
//		Replace cte producer with given expression
//
//---------------------------------------------------------------------------
void
CCTEInfo::ReplaceCTEProducer(CExpression *pexprCTEProducer)
{
	COperator *pop = pexprCTEProducer->Pop();
	ULONG ulCTEId = CLogicalCTEProducer::PopConvert(pop)->UlCTEId();

	CCTEInfoEntry *pcteinfoentry = m_phmulcteinfoentry->Find(&ulCTEId);
	GPOS_ASSERT(nullptr != pcteinfoentry);

#ifdef GPOS_DBUG
	CExpression *pexprCTEProducerOld = pcteinfoentry->Pexpr();
	COperator *popCTEProducerOld = pexprCTEProducerOld->Pop();
	GPOS_ASSERT(ulCTEId ==
				CLogicalCTEProducer::PopConvert(popCTEProducerOld)->UlCTEId());
#endif	// GPOS_DEBUG

	CExpression *pexprCTEProducerNew =
		PexprPreprocessCTEProducer(pexprCTEProducer);

	BOOL fReplaced GPOS_ASSERTS_ONLY = m_phmulcteinfoentry->Replace(
		&ulCTEId, GPOS_NEW(m_mp) CCTEInfoEntry(m_mp, pexprCTEProducerNew,
											   pcteinfoentry->FUsed()));
	GPOS_ASSERT(fReplaced);
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::InitDefaultStats
//
//	@doc:
//		Initialize default statistics for a given CTE Producer
//
//---------------------------------------------------------------------------
void
CCTEInfo::InitDefaultStats(CExpression *pexprCTEProducer)
{
	// Generate statistics with empty requirement. This handles cases when
	// the CTE is a N-Ary join that will require statistics calculation

	CReqdPropRelational *prprel =
		GPOS_NEW(m_mp) CReqdPropRelational(GPOS_NEW(m_mp) CColRefSet(m_mp));
	(void) pexprCTEProducer->PstatsDerive(prprel, nullptr /* stats_ctxt */);

	// cleanup
	prprel->Release();
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::DeriveProducerStats
//
//	@doc:
//		Derive the statistics on the CTE producer
//
//---------------------------------------------------------------------------
void
CCTEInfo::DeriveProducerStats(CLogicalCTEConsumer *popConsumer,
							  CColRefSet *pcrsStat)
{
	const ULONG ulCTEId = popConsumer->UlCTEId();

	CCTEInfoEntry *pcteinfoentry = m_phmulcteinfoentry->Find(&ulCTEId);
	GPOS_ASSERT(nullptr != pcteinfoentry);

	CExpression *pexprCTEProducer = pcteinfoentry->Pexpr();

	// Given the subset of CTE consumer columns needed for statistics derivation,
	// compute its corresponding set of columns in the CTE Producer
	CColRefSet *pcrsCTEProducer =
		CUtils::PcrsCTEProducerColumns(m_mp, pcrsStat, popConsumer);
	GPOS_ASSERT(pcrsStat->Size() == pcrsCTEProducer->Size());

	CReqdPropRelational *prprel =
		GPOS_NEW(m_mp) CReqdPropRelational(pcrsCTEProducer);
	(void) pexprCTEProducer->PstatsDerive(prprel, nullptr /* stats_ctxt */);

	// cleanup
	prprel->Release();
}

//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::PexprCTEProducer
//
//	@doc:
//		Return the logical cte producer with given id
//
//---------------------------------------------------------------------------
CExpression *
CCTEInfo::PexprCTEProducer(ULONG ulCTEId) const
{
	const CCTEInfoEntry *pcteinfoentry = m_phmulcteinfoentry->Find(&ulCTEId);
	GPOS_ASSERT(nullptr != pcteinfoentry);

	return pcteinfoentry->Pexpr();
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::UlConsumersInParent
//
//	@doc:
//		Number of consumers of given CTE inside a given parent
//
//---------------------------------------------------------------------------
ULONG
CCTEInfo::UlConsumersInParent(ULONG ulConsumerId, ULONG ulParentId) const
{
	// get map of given parent
	const UlongToConsumerCounterMap *phmulconsumermap =
		m_phmulprodconsmap->Find(&ulParentId);
	if (nullptr == phmulconsumermap)
	{
		return 0;
	}

	// find counter of given consumer inside this map
	const SConsumerCounter *pconsumercounter =
		phmulconsumermap->Find(&ulConsumerId);
	if (nullptr == pconsumercounter)
	{
		return 0;
	}

	return pconsumercounter->UlCount();
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::UlConsumers
//
//	@doc:
//		Return number of CTE consumers of given CTE
//
//---------------------------------------------------------------------------
ULONG
CCTEInfo::UlConsumers(ULONG ulCTEId) const
{
	// find consumers in main query
	ULONG ulConsumers = UlConsumersInParent(ulCTEId, gpos::ulong_max);

	// find consumers in other CTEs
	UlongToCTEInfoEntryMapIter hmulei(m_phmulcteinfoentry);
	while (hmulei.Advance())
	{
		const CCTEInfoEntry *pcteinfoentry = hmulei.Value();
		if (pcteinfoentry->FUsed())
		{
			ulConsumers +=
				UlConsumersInParent(ulCTEId, pcteinfoentry->UlCTEId());
		}
	}

	return ulConsumers;
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::FUsed
//
//	@doc:
//		Check if given CTE is used
//
//---------------------------------------------------------------------------
BOOL
CCTEInfo::FUsed(ULONG ulCTEId) const
{
	CCTEInfoEntry *pcteinfoentry = m_phmulcteinfoentry->Find(&ulCTEId);
	GPOS_ASSERT(nullptr != pcteinfoentry);
	return pcteinfoentry->FUsed();
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::IncrementConsumers
//
//	@doc:
//		Increment number of CTE consumers
//
//---------------------------------------------------------------------------
void
CCTEInfo::IncrementConsumers(ULONG ulConsumerId, ULONG ulParentCTEId)
{
	// get map of given parent
	UlongToConsumerCounterMap *phmulconsumermap =
		m_phmulprodconsmap->Find(&ulParentCTEId);
	if (nullptr == phmulconsumermap)
	{
		phmulconsumermap = GPOS_NEW(m_mp) UlongToConsumerCounterMap(m_mp);
		BOOL fInserted GPOS_ASSERTS_ONLY = m_phmulprodconsmap->Insert(
			GPOS_NEW(m_mp) ULONG(ulParentCTEId), phmulconsumermap);
		GPOS_ASSERT(fInserted);
	}

	// find counter of given consumer inside this map
	SConsumerCounter *pconsumercounter = phmulconsumermap->Find(&ulConsumerId);
	if (nullptr == pconsumercounter)
	{
		// no existing counter - start a new one
		BOOL fInserted GPOS_ASSERTS_ONLY = phmulconsumermap->Insert(
			GPOS_NEW(m_mp) ULONG(ulConsumerId),
			GPOS_NEW(m_mp) SConsumerCounter(ulConsumerId));
		GPOS_ASSERT(fInserted);
	}
	else
	{
		// counter already exists - just increment it
		pconsumercounter->Increment();
	}
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::PcterProducers
//
//	@doc:
//		Return a CTE requirement with all the producers as optional
//
//---------------------------------------------------------------------------
CCTEReq *
CCTEInfo::PcterProducers(CMemoryPool *mp) const
{
	CCTEReq *pcter = GPOS_NEW(mp) CCTEReq(mp);

	UlongToCTEInfoEntryMapIter hmulei(m_phmulcteinfoentry);
	while (hmulei.Advance())
	{
		const CCTEInfoEntry *pcteinfoentry = hmulei.Value();
		pcter->Insert(pcteinfoentry->UlCTEId(), CCTEMap::EctProducer,
					  false /*fRequired*/, nullptr /*pdpplan*/);
	}

	return pcter;
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::PdrgPexpr
//
//	@doc:
//		Return an array of all stored CTE expressions
//
//---------------------------------------------------------------------------
CExpressionArray *
CCTEInfo::PdrgPexpr(CMemoryPool *mp) const
{
	CExpressionArray *pdrgpexpr = GPOS_NEW(mp) CExpressionArray(mp);
	UlongToCTEInfoEntryMapIter hmulei(m_phmulcteinfoentry);
	while (hmulei.Advance())
	{
		CExpression *pexpr = hmulei.Value()->Pexpr();
		pexpr->AddRef();
		pdrgpexpr->Append(pexpr);
	}

	return pdrgpexpr;
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::MapComputedToUsedCols
//
//	@doc:
//		Walk the producer expressions and add the mapping between computed
//		column and its used columns
//
//---------------------------------------------------------------------------
void
CCTEInfo::MapComputedToUsedCols(CColumnFactory *col_factory) const
{
	UlongToCTEInfoEntryMapIter hmulei(m_phmulcteinfoentry);
	while (hmulei.Advance())
	{
		CExpression *pexprProducer = hmulei.Value()->Pexpr();
		GPOS_ASSERT(nullptr != pexprProducer);
		CQueryContext::MapComputedToUsedCols(col_factory, pexprProducer);
	}
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::AddConsumerCols
//
//	@doc:
//		Add given columns to consumers column map
//
//---------------------------------------------------------------------------
void
CCTEInfo::AddConsumerCols(ULONG ulCTEId, CColRefArray *colref_array)
{
	GPOS_ASSERT(nullptr != colref_array);

	CCTEInfoEntry *pcteinfoentry = m_phmulcteinfoentry->Find(&ulCTEId);
	GPOS_ASSERT(nullptr != pcteinfoentry);

	pcteinfoentry->AddConsumerCols(colref_array);
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::UlConsumerColPos
//
//	@doc:
//		Return position of given consumer column in consumer output
//
//---------------------------------------------------------------------------
ULONG
CCTEInfo::UlConsumerColPos(ULONG ulCTEId, CColRef *colref)
{
	GPOS_ASSERT(nullptr != colref);

	CCTEInfoEntry *pcteinfoentry = m_phmulcteinfoentry->Find(&ulCTEId);
	GPOS_ASSERT(nullptr != pcteinfoentry);

	return pcteinfoentry->UlConsumerColPos(colref);
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::FindConsumersInParent
//
//	@doc:
//		Find all CTE consumers inside given parent, and push them to the given stack
//
//---------------------------------------------------------------------------
void
CCTEInfo::FindConsumersInParent(ULONG ulParentId, CBitSet *pbsUnusedConsumers,
								CStack<ULONG> *pstack)
{
	UlongToConsumerCounterMap *phmulconsumermap =
		m_phmulprodconsmap->Find(&ulParentId);
	if (nullptr == phmulconsumermap)
	{
		// no map found for given parent - there are no consumers inside it
		return;
	}

	UlongToConsumerCounterMapIter hmulci(phmulconsumermap);
	while (hmulci.Advance())
	{
		const SConsumerCounter *pconsumercounter = hmulci.Value();
		ULONG ulConsumerId = pconsumercounter->UlCTEId();
		if (pbsUnusedConsumers->Get(ulConsumerId))
		{
			pstack->Push(GPOS_NEW(m_mp) ULONG(ulConsumerId));
			pbsUnusedConsumers->ExchangeClear(ulConsumerId);
		}
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::MarkUnusedCTEs
//
//	@doc:
//		Mark unused CTEs
//
//---------------------------------------------------------------------------
void
CCTEInfo::MarkUnusedCTEs()
{
	CBitSet *pbsUnusedConsumers = GPOS_NEW(m_mp) CBitSet(m_mp);

	// start with all CTEs
	UlongToCTEInfoEntryMapIter hmulei(m_phmulcteinfoentry);
	while (hmulei.Advance())
	{
		const CCTEInfoEntry *pcteinfoentry = hmulei.Value();
		pbsUnusedConsumers->ExchangeSet(pcteinfoentry->UlCTEId());
	}

	// start with the main query and find out which CTEs are used there
	CStack<ULONG> stack(m_mp);
	FindConsumersInParent(gpos::ulong_max, pbsUnusedConsumers, &stack);

	// repeatedly find CTEs that are used in these CTEs
	while (!stack.IsEmpty())
	{
		// get one CTE id from list, and see which consumers are inside this CTE
		ULONG *pulCTEId = stack.Pop();
		FindConsumersInParent(*pulCTEId, pbsUnusedConsumers, &stack);
		GPOS_DELETE(pulCTEId);
	}

	// now the only CTEs remaining in the bitset are the unused ones. mark them as such
	UlongToCTEInfoEntryMapIter hmulei2(m_phmulcteinfoentry);
	while (hmulei2.Advance())
	{
		CCTEInfoEntry *pcteinfoentry =
			const_cast<CCTEInfoEntry *>(hmulei2.Value());
		if (pbsUnusedConsumers->Get(pcteinfoentry->UlCTEId()))
		{
			pcteinfoentry->MarkUnused();
		}
	}

	pbsUnusedConsumers->Release();
}


//---------------------------------------------------------------------------
//	@function:
//		CCTEInfo::PhmulcrConsumerToProducer
//
//	@doc:
//		Return a map from Id's of consumer columns in the given column set
//		to their corresponding producer columns in the given column array
//
//---------------------------------------------------------------------------
UlongToColRefMap *
CCTEInfo::PhmulcrConsumerToProducer(
	CMemoryPool *mp, ULONG ulCTEId,
	CColRefSet *pcrs,			   // set of columns to check
	CColRefArray *pdrgpcrProducer  // producer columns
)
{
	GPOS_ASSERT(nullptr != pcrs);
	GPOS_ASSERT(nullptr != pdrgpcrProducer);

	UlongToColRefMap *colref_mapping = GPOS_NEW(mp) UlongToColRefMap(mp);

	CColRefSetIter crsi(*pcrs);
	while (crsi.Advance())
	{
		CColRef *colref = crsi.Pcr();
		ULONG ulPos = UlConsumerColPos(ulCTEId, colref);

		if (gpos::ulong_max != ulPos)
		{
			GPOS_ASSERT(ulPos < pdrgpcrProducer->Size());

			CColRef *pcrProducer = (*pdrgpcrProducer)[ulPos];
			BOOL fSuccess GPOS_ASSERTS_ONLY = colref_mapping->Insert(
				GPOS_NEW(mp) ULONG(colref->Id()), pcrProducer);
			GPOS_ASSERT(fSuccess);
		}
	}
	return colref_mapping;
}


// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CAutoOptCtxt 源码

greenplumn CCTEMap 源码

greenplumn CCTEReq 源码

greenplumn CCastUtils 源码

greenplumn CColConstraintsArrayMapper 源码

greenplumn CColConstraintsHashMapper 源码

greenplumn CColRef 源码

greenplumn CColRefComputed 源码

greenplumn CColRefSet 源码

greenplumn CColRefSetIter 源码

0  赞