greenplumn CScalarNullTest 源码
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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