greenplumn CScalarBoolOp 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CScalarBoolOp.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CScalarBoolOp.cpp
/
/ @doc:
/ Implementation of scalar boolean operator
/---------------------------------------------------------------------------
#include "gpopt/operators/CScalarBoolOp.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;
const WCHAR CScalarBoolOp::m_rgwszBool[EboolopSentinel][30] = {
GPOS_WSZ_LIT("EboolopAnd"), GPOS_WSZ_LIT("EboolopOr"),
GPOS_WSZ_LIT("EboolopNot")};
/---------------------------------------------------------------------------
/ @function:
/ CScalarBoolOp::HashValue
/
/ @doc:
/ Operator specific hash function; combined hash of operator id and
/ id of comparison
/
/---------------------------------------------------------------------------
ULONG
CScalarBoolOp::HashValue() const
{
ULONG ulBoolop = (ULONG) Eboolop();
return gpos::CombineHashes(COperator::HashValue(),
gpos::HashValue<ULONG>(&ulBoolop));
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarBoolOp::Matches
/
/ @doc:
/ Match function on operator level
/
/---------------------------------------------------------------------------
BOOL
CScalarBoolOp::Matches(COperator *pop) const
{
if (pop->Eopid() == Eopid())
{
CScalarBoolOp *popLog = CScalarBoolOp::PopConvert(pop);
/ match if operators are identical
return Eboolop() == popLog->Eboolop();
}
return false;
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarBoolOp::FCommutative
/
/ @doc:
/ Is boolean operator commutative?
/
/---------------------------------------------------------------------------
BOOL
CScalarBoolOp::FCommutative(EBoolOperator eboolop)
{
switch (eboolop)
{
case EboolopAnd:
case EboolopOr:
return true;
case EboolopNot:
default:
return false;
}
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarBoolOp::MdidType
/
/ @doc:
/ Expression type
/
/---------------------------------------------------------------------------
IMDId *
CScalarBoolOp::MdidType() const
{
CMDAccessor *md_accessor = COptCtxt::PoctxtFromTLS()->Pmda();
return md_accessor->PtMDType<IMDTypeBool>()->MDId();
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarBoolOp::Eber
/
/ @doc:
/ Perform boolean expression evaluation
/
/---------------------------------------------------------------------------
CScalar::EBoolEvalResult
CScalarBoolOp::Eber(ULongPtrArray *pdrgpulChildren) const
{
if (EboolopAnd == m_eboolop)
{
return EberConjunction(pdrgpulChildren);
}
if (EboolopOr == m_eboolop)
{
return EberDisjunction(pdrgpulChildren);
}
GPOS_ASSERT(EboolopNot == m_eboolop);
GPOS_ASSERT(nullptr != pdrgpulChildren);
GPOS_ASSERT(1 == pdrgpulChildren->Size());
EBoolEvalResult eber = (EBoolEvalResult) * ((*pdrgpulChildren)[0]);
switch (eber)
{
case EberTrue:
return EberFalse;
case EberFalse:
return EberTrue;
case EberNull:
return EberNull;
case EberNotTrue:
default:
return EberAny;
}
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarBoolOp::OsPrint
/
/ @doc:
/ debug print
/
/---------------------------------------------------------------------------
IOstream &
CScalarBoolOp::OsPrint(IOstream &os) const
{
os << SzId() << " (";
os << m_rgwszBool[m_eboolop];
os << ")";
return os;
}
/ EOF
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