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
相关信息
相关文章
greenplumn CExpressionFactorizer 源码
greenplumn CExpressionHandle 源码
greenplumn CExpressionPreprocessor 源码
greenplumn CExpressionUtils 源码