greenplumn CLogicalCTEConsumer 源码

greenplumn CLogicalCTEConsumer 代码

文件路径：/src/backend/gporca/libgpopt/src/operators/CLogicalCTEConsumer.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CLogicalCTEConsumer.cpp
//
//	@doc:
//		Implementation of CTE consumer operator
//---------------------------------------------------------------------------

#include "gpopt/operators/CLogicalCTEConsumer.h"

#include "gpos/base.h"

#include "gpopt/base/CKeyCollection.h"
#include "gpopt/base/CMaxCard.h"
#include "gpopt/base/COptCtxt.h"
#include "gpopt/operators/CExpression.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalCTEProducer.h"

using namespace gpopt;

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::CLogicalCTEConsumer
//
//	@doc:
//		Ctor - for pattern
//
//---------------------------------------------------------------------------
CLogicalCTEConsumer::CLogicalCTEConsumer(CMemoryPool *mp)
	: CLogical(mp),
	  m_id(0),
	  m_pdrgpcr(nullptr),
	  m_pexprInlined(nullptr),
	  m_phmulcr(nullptr),
	  m_pcrsOutput(nullptr)
{
	m_fPattern = true;
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::CLogicalCTEConsumer
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CLogicalCTEConsumer::CLogicalCTEConsumer(CMemoryPool *mp, ULONG id,
										 CColRefArray *colref_array)
	: CLogical(mp),
	  m_id(id),
	  m_pdrgpcr(colref_array),
	  m_pexprInlined(nullptr),
	  m_phmulcr(nullptr)
{
	GPOS_ASSERT(nullptr != colref_array);
	m_pcrsOutput = GPOS_NEW(mp) CColRefSet(mp, m_pdrgpcr);
	CreateInlinedExpr(mp);
	m_pcrsLocalUsed->Include(m_pdrgpcr);

	// map consumer columns to their positions in consumer output
	COptCtxt::PoctxtFromTLS()->Pcteinfo()->AddConsumerCols(id, m_pdrgpcr);
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::~CLogicalCTEConsumer
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------
CLogicalCTEConsumer::~CLogicalCTEConsumer()
{
	CRefCount::SafeRelease(m_pdrgpcr);
	CRefCount::SafeRelease(m_pexprInlined);
	CRefCount::SafeRelease(m_phmulcr);
	CRefCount::SafeRelease(m_pcrsOutput);
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::CreateInlinedExpr
//
//	@doc:
//		Create the inlined version of this consumer as well as the column mapping
//
//---------------------------------------------------------------------------
void
CLogicalCTEConsumer::CreateInlinedExpr(CMemoryPool *mp)
{
	CExpression *pexprProducer =
		COptCtxt::PoctxtFromTLS()->Pcteinfo()->PexprCTEProducer(m_id);
	GPOS_ASSERT(nullptr != pexprProducer);
	// the actual definition of the CTE is the first child of the producer
	CExpression *pexprCTEDef = (*pexprProducer)[0];

	CLogicalCTEProducer *popProducer =
		CLogicalCTEProducer::PopConvert(pexprProducer->Pop());

	m_phmulcr = CUtils::PhmulcrMapping(mp, popProducer->Pdrgpcr(), m_pdrgpcr);
	m_pexprInlined = pexprCTEDef->PexprCopyWithRemappedColumns(
		mp, m_phmulcr, true /*must_exist*/);
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::DeriveOutputColumns
//
//	@doc:
//		Derive output columns
//
//---------------------------------------------------------------------------
CColRefSet *
CLogicalCTEConsumer::DeriveOutputColumns(CMemoryPool *,		  //mp,
										 CExpressionHandle &  //exprhdl
)
{
	m_pcrsOutput->AddRef();
	return m_pcrsOutput;
}


//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::DeriveNotNullColumns
//
//	@doc:
//		Derive not nullable output columns
//
//---------------------------------------------------------------------------
CColRefSet *
CLogicalCTEConsumer::DeriveNotNullColumns(CMemoryPool *mp,
										  CExpressionHandle &  // exprhdl
) const
{
	CExpression *pexprProducer =
		COptCtxt::PoctxtFromTLS()->Pcteinfo()->PexprCTEProducer(m_id);
	GPOS_ASSERT(nullptr != pexprProducer);

	// find producer's not null columns
	CColRefSet *pcrsProducerNotNull = pexprProducer->DeriveNotNullColumns();

	// map producer's not null columns to consumer's output columns
	CColRefSet *pcrsConsumerNotNull = CUtils::PcrsRemap(
		mp, pcrsProducerNotNull, m_phmulcr, true /*must_exist*/);
	GPOS_ASSERT(pcrsConsumerNotNull->Size() == pcrsProducerNotNull->Size());

	return pcrsConsumerNotNull;
}


//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::PkcDeriveKeys
//
//	@doc:
//		Derive key collection
//
//---------------------------------------------------------------------------
CKeyCollection *
CLogicalCTEConsumer::DeriveKeyCollection(CMemoryPool *,		  //mp,
										 CExpressionHandle &  //exprhdl
) const
{
	CExpression *pexpr =
		COptCtxt::PoctxtFromTLS()->Pcteinfo()->PexprCTEProducer(m_id);
	GPOS_ASSERT(nullptr != pexpr);
	CKeyCollection *pkc = pexpr->DeriveKeyCollection();
	if (nullptr != pkc)
	{
		pkc->AddRef();
	}

	return pkc;
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::DerivePartitionInfo
//
//	@doc:
//		Derive partition consumers
//
//---------------------------------------------------------------------------
CPartInfo *
CLogicalCTEConsumer::DerivePartitionInfo(CMemoryPool *,		  //mp,
										 CExpressionHandle &  //exprhdl
) const
{
	CPartInfo *ppartInfo = m_pexprInlined->DerivePartitionInfo();
	ppartInfo->AddRef();

	return ppartInfo;
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::DeriveMaxCard
//
//	@doc:
//		Derive max card
//
//---------------------------------------------------------------------------
CMaxCard
CLogicalCTEConsumer::DeriveMaxCard(CMemoryPool *,		//mp,
								   CExpressionHandle &	//exprhdl
) const
{
	CExpression *pexpr =
		COptCtxt::PoctxtFromTLS()->Pcteinfo()->PexprCTEProducer(m_id);
	GPOS_ASSERT(nullptr != pexpr);
	return pexpr->DeriveMaxCard();
}


//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::DeriveJoinDepth
//
//	@doc:
//		Derive join depth
//
//---------------------------------------------------------------------------
ULONG
CLogicalCTEConsumer::DeriveJoinDepth(CMemoryPool *,		  //mp,
									 CExpressionHandle &  //exprhdl
) const
{
	CExpression *pexpr =
		COptCtxt::PoctxtFromTLS()->Pcteinfo()->PexprCTEProducer(m_id);
	GPOS_ASSERT(nullptr != pexpr);
	return pexpr->DeriveJoinDepth();
}

// derive table descriptor
CTableDescriptor *
CLogicalCTEConsumer::DeriveTableDescriptor(CMemoryPool *,		//mp
										   CExpressionHandle &	//exprhdl
) const
{
	CExpression *pexpr =
		COptCtxt::PoctxtFromTLS()->Pcteinfo()->PexprCTEProducer(m_id);
	GPOS_ASSERT(nullptr != pexpr);
	return pexpr->DeriveTableDescriptor();
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::Matches
//
//	@doc:
//		Match function
//
//---------------------------------------------------------------------------
BOOL
CLogicalCTEConsumer::Matches(COperator *pop) const
{
	if (pop->Eopid() != Eopid())
	{
		return false;
	}

	CLogicalCTEConsumer *popCTEConsumer = CLogicalCTEConsumer::PopConvert(pop);

	return m_id == popCTEConsumer->UlCTEId() &&
		   m_pdrgpcr->Equals(popCTEConsumer->Pdrgpcr());
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::HashValue
//
//	@doc:
//		Hash function
//
//---------------------------------------------------------------------------
ULONG
CLogicalCTEConsumer::HashValue() const
{
	ULONG ulHash = gpos::CombineHashes(COperator::HashValue(), m_id);
	ulHash = gpos::CombineHashes(ulHash, CUtils::UlHashColArray(m_pdrgpcr));

	return ulHash;
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::FInputOrderSensitive
//
//	@doc:
//		Not called for leaf operators
//
//---------------------------------------------------------------------------
BOOL
CLogicalCTEConsumer::FInputOrderSensitive() const
{
	GPOS_ASSERT(!"Unexpected function call of FInputOrderSensitive");
	return false;
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::PopCopyWithRemappedColumns
//
//	@doc:
//		Return a copy of the operator with remapped columns
//
//---------------------------------------------------------------------------
COperator *
CLogicalCTEConsumer::PopCopyWithRemappedColumns(
	CMemoryPool *mp, UlongToColRefMap *colref_mapping, BOOL must_exist)
{
	CColRefArray *colref_array = nullptr;
	if (must_exist)
	{
		colref_array =
			CUtils::PdrgpcrRemapAndCreate(mp, m_pdrgpcr, colref_mapping);
	}
	else
	{
		colref_array =
			CUtils::PdrgpcrRemap(mp, m_pdrgpcr, colref_mapping, must_exist);
	}
	return GPOS_NEW(mp) CLogicalCTEConsumer(mp, m_id, colref_array);
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::PxfsCandidates
//
//	@doc:
//		Get candidate xforms
//
//---------------------------------------------------------------------------
CXformSet *
CLogicalCTEConsumer::PxfsCandidates(CMemoryPool *mp) const
{
	CXformSet *xform_set = GPOS_NEW(mp) CXformSet(mp);
	(void) xform_set->ExchangeSet(CXform::ExfInlineCTEConsumer);
	(void) xform_set->ExchangeSet(CXform::ExfImplementCTEConsumer);
	return xform_set;
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::DerivePropertyConstraint
//
//	@doc:
//		Derive constraint property
//
//---------------------------------------------------------------------------
CPropConstraint *
CLogicalCTEConsumer::DerivePropertyConstraint(CMemoryPool *mp,
											  CExpressionHandle &  //exprhdl
) const
{
	CExpression *pexprProducer =
		COptCtxt::PoctxtFromTLS()->Pcteinfo()->PexprCTEProducer(m_id);
	GPOS_ASSERT(nullptr != pexprProducer);
	CPropConstraint *ppc = pexprProducer->DerivePropertyConstraint();
	CColRefSetArray *pdrgpcrs = ppc->PdrgpcrsEquivClasses();
	CConstraint *pcnstr = ppc->Pcnstr();

	// remap producer columns to consumer columns
	CColRefSetArray *pdrgpcrsMapped = GPOS_NEW(mp) CColRefSetArray(mp);
	const ULONG length = pdrgpcrs->Size();
	for (ULONG ul = 0; ul < length; ul++)
	{
		CColRefSet *pcrs = (*pdrgpcrs)[ul];
		CColRefSet *pcrsMapped =
			CUtils::PcrsRemap(mp, pcrs, m_phmulcr, true /*must_exist*/);
		pdrgpcrsMapped->Append(pcrsMapped);
	}

	CConstraint *pcnstrMapped = nullptr;
	if (nullptr != pcnstr)
	{
		pcnstrMapped = pcnstr->PcnstrCopyWithRemappedColumns(
			mp, m_phmulcr, true /*must_exist*/);
	}

	return GPOS_NEW(mp) CPropConstraint(mp, pdrgpcrsMapped, pcnstrMapped);
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::PstatsDerive
//
//	@doc:
//		Derive statistics based on cte producer
//
//---------------------------------------------------------------------------
IStatistics *
CLogicalCTEConsumer::PstatsDerive(CMemoryPool *mp,
								  CExpressionHandle &,	//exprhdl,
								  IStatisticsArray *	// statistics_array
) const
{
	CExpression *pexprProducer =
		COptCtxt::PoctxtFromTLS()->Pcteinfo()->PexprCTEProducer(m_id);
	GPOS_ASSERT(nullptr != pexprProducer);
	const IStatistics *stats = pexprProducer->Pstats();
	GPOS_ASSERT(nullptr != stats);

	// copy the stats with the remaped colids
	IStatistics *new_stats = stats->CopyStatsWithRemap(mp, m_phmulcr);

	return new_stats;
}

//---------------------------------------------------------------------------
//	@function:
//		CLogicalCTEConsumer::OsPrint
//
//	@doc:
//		debug print
//
//---------------------------------------------------------------------------
IOstream &
CLogicalCTEConsumer::OsPrint(IOstream &os) const
{
	os << SzId() << " (";
	os << m_id;
	os << "), Columns: [";
	CUtils::OsPrintDrgPcr(os, m_pdrgpcr);
	os << "]";

	return os;
}

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CExpression 源码

greenplumn CExpressionFactorizer 源码

greenplumn CExpressionHandle 源码

greenplumn CExpressionPreprocessor 源码

greenplumn CExpressionUtils 源码

greenplumn CHashedDistributions 源码

greenplumn CLogical 源码

greenplumn CLogicalApply 源码

greenplumn CLogicalAssert 源码

greenplumn CLogicalBitmapTableGet 源码