greenplumn CScalarNullIf 源码
greenplumn CScalarNullIf 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarNullIf.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CScalarNullIf.h
//
// @doc:
// Scalar NullIf Operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarNullIf_H
#define GPOPT_CScalarNullIf_H
#include "gpos/base.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarNullIf
//
// @doc:
// Scalar NullIf operator
//
//---------------------------------------------------------------------------
class CScalarNullIf : public CScalar
{
private:
// operator id
IMDId *m_mdid_op;
// return type
IMDId *m_mdid_type;
// does operator return NULL on NULL input?
BOOL m_returns_null_on_null_input;
// is operator return type BOOL?
BOOL m_fBoolReturnType;
public:
CScalarNullIf(const CScalarNullIf &) = delete;
// ctor
CScalarNullIf(CMemoryPool *mp, IMDId *mdid_op, IMDId *mdid_type);
// dtor
~CScalarNullIf() override;
// ident accessors
EOperatorId
Eopid() const override
{
return EopScalarNullIf;
}
// operator id
virtual IMDId *
MdIdOp() const
{
return m_mdid_op;
}
// return type
IMDId *
MdidType() const override
{
return m_mdid_type;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarNullIf";
}
// operator specific hash function
ULONG HashValue() const override;
// match function
BOOL Matches(COperator *pop) const override;
// sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return true;
}
// return a copy of the operator with remapped columns
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, //mp,
UlongToColRefMap *, //colref_mapping,
BOOL //must_exist
) override
{
return PopCopyDefault();
}
// boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;
// conversion function
static CScalarNullIf *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarNullIf == pop->Eopid());
return dynamic_cast<CScalarNullIf *>(pop);
}
}; // class CScalarNullIf
} // namespace gpopt
#endif // !GPOPT_CScalarNullIf_H
// EOF
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