greenplumn CDatumSortedSet 源码
greenplumn CDatumSortedSet 代码
文件路径：/src/backend/gporca/libgpopt/src/base/CDatumSortedSet.cpp
// Greenplum Database
// Copyright (C) 2016 VMware, Inc. or its affiliates.
#include "gpopt/base/CDatumSortedSet.h"
#include "gpos/common/CAutoRef.h"
#include "gpopt/base/CUtils.h"
#include "gpopt/operators/COperator.h"
#include "gpopt/operators/CScalarConst.h"
using namespace gpopt;
CDatumSortedSet::CDatumSortedSet(CMemoryPool *mp, CExpression *pexprArray,
const IComparator *pcomp)
: IDatumArray(mp), m_fIncludesNull(false)
{
GPOS_ASSERT(COperator::EopScalarArray == pexprArray->Pop()->Eopid());
const ULONG ulArrayExprArity = CUtils::UlScalarArrayArity(pexprArray);
GPOS_ASSERT(0 < ulArrayExprArity);
gpos::CAutoRef<IDatumArray> aprngdatum(GPOS_NEW(mp) IDatumArray(mp));
for (ULONG ul = 0; ul < ulArrayExprArity; ul++)
{
CScalarConst *popScConst =
CUtils::PScalarArrayConstChildAt(pexprArray, ul);
IDatum *datum = popScConst->GetDatum();
if (datum->IsNull())
{
m_fIncludesNull = true;
}
else
{
datum->AddRef();
aprngdatum->Append(datum);
}
}
aprngdatum->Sort(&CUtils::IDatumCmp);
// de-duplicate
const ULONG ulRangeArrayArity = aprngdatum->Size();
IDatum *pdatumPrev = (*aprngdatum)[0];
pdatumPrev->AddRef();
Append(pdatumPrev);
for (ULONG ul = 1; ul < ulRangeArrayArity; ul++)
{
if (!pcomp->Equals((*aprngdatum)[ul], pdatumPrev))
{
pdatumPrev = (*aprngdatum)[ul];
pdatumPrev->AddRef();
Append(pdatumPrev);
}
}
}
BOOL
CDatumSortedSet::FIncludesNull() const
{
return m_fIncludesNull;
}
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