greenplumn CDistributionSpecSingleton 源码

greenplumn CDistributionSpecSingleton 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CDistributionSpecSingleton.cpp
//
//	@doc:
//		Specification of singleton distribution
//---------------------------------------------------------------------------

#include "gpopt/base/CDistributionSpecSingleton.h"

#include "gpopt/base/CDistributionSpecHashed.h"
#include "gpopt/base/COptCtxt.h"
#include "gpopt/operators/CPhysicalMotionGather.h"
#include "naucrates/traceflags/traceflags.h"


using namespace gpopt;


// initialization of static variables
const CHAR *CDistributionSpecSingleton::m_szSegmentType[EstSentinel] = {
	"master", "segment"};


//---------------------------------------------------------------------------
//	@function:
//		CDistributionSpecSingleton::CDistributionSpecSingleton
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CDistributionSpecSingleton::CDistributionSpecSingleton(ESegmentType est)
	: m_est(est)
{
	GPOS_ASSERT(EstSentinel != est);
}

CDistributionSpecSingleton::CDistributionSpecSingleton()
{
	m_est = EstMaster;

	if (COptCtxt::PoctxtFromTLS()->OptimizeDMLQueryWithSingletonSegment())
	{
		m_est = EstSegment;
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CDistributionSpecSingleton::FSatisfies
//
//	@doc:
//		Check if this distribution spec satisfies the given one
//
//---------------------------------------------------------------------------
BOOL
CDistributionSpecSingleton::FSatisfies(const CDistributionSpec *pds) const
{
	if (Matches(pds))
	{
		// exact match implies satisfaction
		return true;
	}

	if (EdtNonSingleton == pds->Edt())
	{
		// singleton does not satisfy non-singleton requirements
		return false;
	}

	if (EdtAny == pds->Edt())
	{
		// a singleton distribution satisfies "any" distributions
		return true;
	}

	if (EdtHashed == pds->Edt() &&
		CDistributionSpecHashed::PdsConvert(pds)->FSatisfiedBySingleton())
	{
		// a singleton distribution satisfies hashed distributions, if the hashed distribution allows satisfaction
		return true;
	}

	return (EdtSingleton == pds->Edt() &&
			m_est == ((CDistributionSpecSingleton *) pds)->Est());
}


//---------------------------------------------------------------------------
//	@function:
//		CDistributionSpecSingleton::AppendEnforcers
//
//	@doc:
//		Add required enforcers to dynamic array
//
//---------------------------------------------------------------------------
void
CDistributionSpecSingleton::AppendEnforcers(CMemoryPool *mp,
											CExpressionHandle &,  // exprhdl
											CReqdPropPlan *prpp,
											CExpressionArray *pdrgpexpr,
											CExpression *pexpr)
{
	GPOS_ASSERT(nullptr != mp);
	GPOS_ASSERT(nullptr != prpp);
	GPOS_ASSERT(nullptr != pdrgpexpr);
	GPOS_ASSERT(nullptr != pexpr);
	GPOS_ASSERT(!GPOS_FTRACE(EopttraceDisableMotions));
	GPOS_ASSERT(
		this == prpp->Ped()->PdsRequired() &&
		"required plan properties don't match enforced distribution spec");


	if (GPOS_FTRACE(EopttraceDisableMotionGather))
	{
		// gather Motion is disabled
		return;
	}

	pexpr->AddRef();
	CExpression *pexprMotion = GPOS_NEW(mp)
		CExpression(mp, GPOS_NEW(mp) CPhysicalMotionGather(mp, m_est), pexpr);
	pdrgpexpr->Append(pexprMotion);

	if (!prpp->Peo()->PosRequired()->IsEmpty())
	{
		COrderSpec *pos = prpp->Peo()->PosRequired();
		pos->AddRef();
		pexpr->AddRef();

		CExpression *pexprGatherMerge = GPOS_NEW(mp) CExpression(
			mp, GPOS_NEW(mp) CPhysicalMotionGather(mp, m_est, pos), pexpr);
		pdrgpexpr->Append(pexprGatherMerge);
	}
}


//---------------------------------------------------------------------------
//	@function:
//		CDistributionSpecSingleton::OsPrint
//
//	@doc:
//		Print function
//
//---------------------------------------------------------------------------
IOstream &
CDistributionSpecSingleton::OsPrint(IOstream &os) const
{
	return os << "SINGLETON (" << m_szSegmentType[m_est] << ")";
}


// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CAutoOptCtxt 源码

greenplumn CCTEInfo 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