greenplumn CScalarBoolOp 源码
greenplumn CScalarBoolOp 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarBoolOp.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarBoolOp.h
//
// @doc:
// Base class for all scalar boolean operators
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarBoolOp_H
#define GPOPT_CScalarBoolOp_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarBoolOp
//
// @doc:
// Scalar boolean operator
//
//---------------------------------------------------------------------------
class CScalarBoolOp : public CScalar
{
public:
// enum of boolean operators
enum EBoolOperator
{
EboolopAnd, // AND
EboolopOr, // OR
EboolopNot, // NOT
EboolopSentinel
};
private:
static const WCHAR m_rgwszBool[EboolopSentinel][30];
// boolean operator
EBoolOperator m_eboolop;
public:
CScalarBoolOp(const CScalarBoolOp &) = delete;
// ctor
CScalarBoolOp(CMemoryPool *mp, EBoolOperator eboolop)
: CScalar(mp), m_eboolop(eboolop)
{
GPOS_ASSERT(0 <= eboolop && EboolopSentinel > eboolop);
}
// dtor
~CScalarBoolOp() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopScalarBoolOp;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarBoolOp";
}
// accessor
EBoolOperator
Eboolop() const
{
return m_eboolop;
}
// operator specific hash function
ULONG HashValue() const override;
// match function
BOOL Matches(COperator *) const override;
// sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return !FCommutative(Eboolop());
}
// return a copy of the operator with remapped columns
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, //mp,
UlongToColRefMap *, //colref_mapping,
BOOL //must_exist
) override
{
return PopCopyDefault();
}
// conversion function
static CScalarBoolOp *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarBoolOp == pop->Eopid());
return dynamic_cast<CScalarBoolOp *>(pop);
}
// boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;
// decide boolean operator commutativity
static BOOL FCommutative(EBoolOperator eboolop);
// the type of the scalar expression
IMDId *MdidType() const override;
// print
IOstream &OsPrint(IOstream &os) const override;
}; // class CScalarBoolOp
} // namespace gpopt
#endif // !GPOPT_CScalarBoolOp_H
// EOF
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