greenplumn CScalarNullTest 源码
greenplumn CScalarNullTest 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CScalarNullTest.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarNullTest.cpp
//
// @doc:
// Implementation of scalar null test operator
//---------------------------------------------------------------------------
#include "gpopt/operators/CScalarNullTest.h"
#include "gpos/base.h"
#include "gpopt/base/CColRefSet.h"
#include "gpopt/base/CDrvdPropScalar.h"
#include "gpopt/base/COptCtxt.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "naucrates/md/IMDTypeBool.h"
using namespace gpopt;
using namespace gpmd;
//---------------------------------------------------------------------------
// @function:
// CScalarNullTest::Matches
//
// @doc:
// Match function on operator level
//
//---------------------------------------------------------------------------
BOOL
CScalarNullTest::Matches(COperator *pop) const
{
return pop->Eopid() == Eopid();
}
//---------------------------------------------------------------------------
// @function:
// CScalarNullTest::MdidType
//
// @doc:
// Expression type
//
//---------------------------------------------------------------------------
IMDId *
CScalarNullTest::MdidType() const
{
CMDAccessor *md_accessor = COptCtxt::PoctxtFromTLS()->Pmda();
return md_accessor->PtMDType<IMDTypeBool>()->MDId();
}
//---------------------------------------------------------------------------
// @function:
// CScalarNullTest::Eber
//
// @doc:
// Perform boolean expression evaluation
//
//---------------------------------------------------------------------------
CScalar::EBoolEvalResult
CScalarNullTest::Eber(ULongPtrArray *pdrgpulChildren) const
{
GPOS_ASSERT(nullptr != pdrgpulChildren);
GPOS_ASSERT(1 == pdrgpulChildren->Size());
EBoolEvalResult eber = (EBoolEvalResult) * ((*pdrgpulChildren)[0]);
switch (eber)
{
case EberNull:
return EberTrue;
case EberFalse:
case EberTrue:
return EberFalse;
case EberNotTrue:
default:
return EberAny;
}
}
// EOF
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