greenplumn CScalarNullTest 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarNullTest.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CScalarNullTest.h
/
/ @doc:
/ Scalar null test
/---------------------------------------------------------------------------
#ifndef GPOPT_CScalarNullTest_H
#define GPOPT_CScalarNullTest_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CScalarNullTest
/
/ @doc:
/ Scalar null test operator
/
/---------------------------------------------------------------------------
class CScalarNullTest : public CScalar
{
private:
public:
CScalarNullTest(const CScalarNullTest &) = delete;
/ ctor
explicit CScalarNullTest(CMemoryPool *mp) : CScalar(mp)
{
}
/ dtor
~CScalarNullTest() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopScalarNullTest;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarNullTest";
}
/ match function
BOOL Matches(COperator *) const override;
/ sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return false;
}
/ return a copy of the operator with remapped columns
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, /mp,
UlongToColRefMap *, /colref_mapping,
BOOL /must_exist
) override
{
return PopCopyDefault();
}
/ the type of the scalar expression
IMDId *MdidType() const override;
/ boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;
/ conversion function
static CScalarNullTest *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarNullTest == pop->Eopid());
return dynamic_cast<CScalarNullTest *>(pop);
}
}; / class CScalarNullTest
} / namespace gpopt
#endif / !GPOPT_CScalarNullTest_H
/ EOF
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