greenplumn CColConstraintsHashMapper 源码
greenplumn CColConstraintsHashMapper 代码
文件路径：/src/backend/gporca/libgpopt/src/base/CColConstraintsHashMapper.cpp
// Greenplum Database
// Copyright (C) 2016 VMware, Inc. or its affiliates.
#include "gpopt/base/CColConstraintsHashMapper.h"
#include "gpos/common/CAutoRef.h"
using namespace gpopt;
CConstraintArray *
CColConstraintsHashMapper::PdrgPcnstrLookup(CColRef *colref)
{
CConstraintArray *pdrgpcnstrCol = m_phmColConstr->Find(colref);
pdrgpcnstrCol->AddRef();
return pdrgpcnstrCol;
}
// mapping between columns and single column constraints in array of constraints
static ColRefToConstraintArrayMap *
PhmcolconstrSingleColConstr(CMemoryPool *mp, const CConstraintArray *drgPcnstr)
{
ColRefToConstraintArrayMap *phmcolconstr =
GPOS_NEW(mp) ColRefToConstraintArrayMap(mp);
const ULONG length = drgPcnstr->Size();
for (ULONG ul = 0; ul < length; ul++)
{
CConstraint *pcnstrChild = (*drgPcnstr)[ul];
CColRefSet *pcrs = pcnstrChild->PcrsUsed();
if (1 == pcrs->Size())
{
CColRef *colref = pcrs->PcrFirst();
CConstraintArray *pcnstrMapped = phmcolconstr->Find(colref);
if (nullptr == pcnstrMapped)
{
pcnstrMapped = GPOS_NEW(mp) CConstraintArray(mp);
phmcolconstr->Insert(colref, pcnstrMapped);
}
pcnstrChild->AddRef();
pcnstrMapped->Append(pcnstrChild);
}
}
return phmcolconstr;
}
CColConstraintsHashMapper::CColConstraintsHashMapper(
CMemoryPool *mp, CConstraintArray *pdrgpcnstr)
: m_phmColConstr(PhmcolconstrSingleColConstr(mp, pdrgpcnstr))
{
}
CColConstraintsHashMapper::~CColConstraintsHashMapper()
{
m_phmColConstr->Release();
}
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