greenplumn CLogicalIndexApply 源码

greenplumn CLogicalIndexApply 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2018 VMware, Inc. or its affiliates.
//
//	Implementation of inner / left outer index apply operator
//---------------------------------------------------------------------------

#include "gpopt/operators/CLogicalIndexApply.h"

#include "gpos/base.h"

#include "naucrates/statistics/CJoinStatsProcessor.h"

using namespace gpopt;

CLogicalIndexApply::CLogicalIndexApply(CMemoryPool *mp)
	: CLogicalApply(mp),
	  m_pdrgpcrOuterRefs(nullptr),
	  m_fOuterJoin(false),
	  m_origJoinPred(nullptr)
{
	m_fPattern = true;
}

CLogicalIndexApply::CLogicalIndexApply(CMemoryPool *mp,
									   CColRefArray *pdrgpcrOuterRefs,
									   BOOL fOuterJoin,
									   CExpression *origJoinPred)
	: CLogicalApply(mp),
	  m_pdrgpcrOuterRefs(pdrgpcrOuterRefs),
	  m_fOuterJoin(fOuterJoin),
	  m_origJoinPred(origJoinPred)
{
	GPOS_ASSERT(nullptr != pdrgpcrOuterRefs);
	if (nullptr != origJoinPred)
	{
		// We don't allow subqueries in the expression that we
		// store in the logical operator, since such expressions
		// would be unsuitable for generating a plan.
		GPOS_RTL_ASSERT(!origJoinPred->DeriveHasSubquery());
		origJoinPred->AddRef();
	}
}


CLogicalIndexApply::~CLogicalIndexApply()
{
	CRefCount::SafeRelease(m_pdrgpcrOuterRefs);
	CRefCount::SafeRelease(m_origJoinPred);
}


CMaxCard
CLogicalIndexApply::DeriveMaxCard(CMemoryPool *,  // mp
								  CExpressionHandle &exprhdl) const
{
	return CLogical::Maxcard(exprhdl, 2 /*ulScalarIndex*/, MaxcardDef(exprhdl));
}


CXformSet *
CLogicalIndexApply::PxfsCandidates(CMemoryPool *mp) const
{
	CXformSet *xform_set = GPOS_NEW(mp) CXformSet(mp);
	(void) xform_set->ExchangeSet(CXform::ExfImplementIndexApply);
	return xform_set;
}

BOOL
CLogicalIndexApply::Matches(COperator *pop) const
{
	GPOS_ASSERT(nullptr != pop);

	if (pop->Eopid() == Eopid())
	{
		return m_pdrgpcrOuterRefs->Equals(
			CLogicalIndexApply::PopConvert(pop)->PdrgPcrOuterRefs());
	}

	return false;
}


IStatistics *
CLogicalIndexApply::PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
								 IStatisticsArray *	 // stats_ctxt
) const
{
	GPOS_ASSERT(EspNone < Esp(exprhdl));

	IStatistics *outer_stats = exprhdl.Pstats(0);
	IStatistics *inner_side_stats = exprhdl.Pstats(1);
	CExpression *pexprScalar = exprhdl.PexprScalarRepChild(2 /*child_index*/);

	// join stats of the children
	IStatisticsArray *statistics_array = GPOS_NEW(mp) IStatisticsArray(mp);
	outer_stats->AddRef();
	statistics_array->Append(outer_stats);
	inner_side_stats->AddRef();
	statistics_array->Append(inner_side_stats);
	IStatistics *stats = CJoinStatsProcessor::CalcAllJoinStats(
		mp, statistics_array, pexprScalar,
		const_cast<CLogicalIndexApply *>(this));
	statistics_array->Release();

	return stats;
}

// return a copy of the operator with remapped columns
COperator *
CLogicalIndexApply::PopCopyWithRemappedColumns(CMemoryPool *mp,
											   UlongToColRefMap *colref_mapping,
											   BOOL must_exist)
{
	COperator *result = nullptr;
	CColRefArray *colref_array = CUtils::PdrgpcrRemap(
		mp, m_pdrgpcrOuterRefs, colref_mapping, must_exist);
	CExpression *remapped_orig_join_pred = nullptr;

	if (nullptr != m_origJoinPred)
	{
		remapped_orig_join_pred = m_origJoinPred->PexprCopyWithRemappedColumns(
			mp, colref_mapping, must_exist);
	}

	result = GPOS_NEW(mp) CLogicalIndexApply(mp, colref_array, m_fOuterJoin,
											 remapped_orig_join_pred);
	CRefCount::SafeRelease(remapped_orig_join_pred);

	return result;
}

// EOF

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