greenplumn CScalarIsDistinctFrom 源码
greenplumn CScalarIsDistinctFrom 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CScalarIsDistinctFrom.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CScalarIsDistinctFrom.cpp
//
// @doc:
// Implementation of scalar IDF comparison operator
//---------------------------------------------------------------------------
#include "gpopt/operators/CScalarIsDistinctFrom.h"
#include "gpopt/base/COptCtxt.h"
#include "gpopt/mdcache/CMDAccessorUtils.h"
using namespace gpopt;
using namespace gpmd;
// conversion function
CScalarIsDistinctFrom *
CScalarIsDistinctFrom::PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarIsDistinctFrom == pop->Eopid());
return dynamic_cast<CScalarIsDistinctFrom *>(pop);
}
// perform boolean expression evaluation
CScalar::EBoolEvalResult
CScalarIsDistinctFrom::Eber(ULongPtrArray *pdrgpulChildren) const
{
GPOS_ASSERT(2 == pdrgpulChildren->Size());
// Is Distinct From(IDF) expression will always evaluate
// to a true/false/unknown but not a NULL
EBoolEvalResult firstResult = (EBoolEvalResult) * (*pdrgpulChildren)[0];
EBoolEvalResult secondResult = (EBoolEvalResult) * (*pdrgpulChildren)[1];
if (firstResult == EberAny || secondResult == EberAny ||
firstResult == EberNotTrue || secondResult == EberNotTrue)
{
return CScalar::EberAny;
}
else if (firstResult != secondResult)
{
return CScalar::EberTrue;
}
return CScalar::EberFalse;
}
BOOL
CScalarIsDistinctFrom::Matches(COperator *pop) const
{
if (pop->Eopid() == Eopid())
{
CScalarIsDistinctFrom *popIDF = CScalarIsDistinctFrom::PopConvert(pop);
// match if operator mdids are identical
return MdIdOp()->Equals(popIDF->MdIdOp());
}
return false;
}
// get commuted scalar IDF operator
CScalarCmp *
CScalarIsDistinctFrom::PopCommutedOp(CMemoryPool *mp)
{
CMDAccessor *md_accessor = COptCtxt::PoctxtFromTLS()->Pmda();
IMDId *mdid = PmdidCommuteOp(md_accessor, this);
if (nullptr != mdid && mdid->IsValid())
{
return GPOS_NEW(mp)
CScalarIsDistinctFrom(mp, mdid, Pstr(mp, md_accessor, mdid));
}
return nullptr;
}
// EOF
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