greenplumn CScalarIsDistinctFrom 源码
greenplumn CScalarIsDistinctFrom 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarIsDistinctFrom.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarIsDistinctFrom.h
//
// @doc:
// Is distinct from operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarIsDistinctFrom_H
#define GPOPT_CScalarIsDistinctFrom_H
#include "gpos/base.h"
#include "gpopt/operators/CScalarCmp.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarIsDistinctFrom
//
// @doc:
// Is distinct from operator
//
//---------------------------------------------------------------------------
class CScalarIsDistinctFrom : public CScalarCmp
{
private:
public:
CScalarIsDistinctFrom(const CScalarIsDistinctFrom &) = delete;
// ctor
CScalarIsDistinctFrom(CMemoryPool *mp, IMDId *mdid_op,
const CWStringConst *pstrOp)
: CScalarCmp(mp, mdid_op, pstrOp, IMDType::EcmptIDF)
{
GPOS_ASSERT(mdid_op->IsValid());
}
// dtor
~CScalarIsDistinctFrom() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopScalarIsDistinctFrom;
}
// boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarIsDistinctFrom";
}
BOOL Matches(COperator *pop) const override;
// conversion function
static CScalarIsDistinctFrom *PopConvert(COperator *pop);
// get commuted scalar IDF operator
CScalarCmp *PopCommutedOp(CMemoryPool *mp) override;
}; // class CScalarIsDistinctFrom
} // namespace gpopt
#endif // !GPOPT_CScalarIsDistinctFrom_H
// EOF
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