greenplumn IComparator 源码
greenplumn IComparator 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/IComparator.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// IComparator.h
//
// @doc:
// Interface for comparing IDatum instances.
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPOPT_IComparator_H
#define GPOPT_IComparator_H
#include "gpos/base.h"
namespace gpnaucrates
{
// fwd declarations
class IDatum;
} // namespace gpnaucrates
namespace gpopt
{
using gpnaucrates::IDatum;
//---------------------------------------------------------------------------
// @class:
// IComparator
//
// @doc:
// Interface for comparing IDatum instances.
//
//---------------------------------------------------------------------------
class IComparator
{
public:
virtual ~IComparator() = default;
// tests if the two arguments are equal
virtual gpos::BOOL Equals(const IDatum *datum1,
const IDatum *datum2) const = 0;
// tests if the first argument is less than the second
virtual gpos::BOOL IsLessThan(const IDatum *datum1,
const IDatum *datum2) const = 0;
// tests if the first argument is less or equal to the second
virtual gpos::BOOL IsLessThanOrEqual(const IDatum *datum1,
const IDatum *datum2) const = 0;
// tests if the first argument is greater than the second
virtual gpos::BOOL IsGreaterThan(const IDatum *datum1,
const IDatum *datum2) const = 0;
// tests if the first argument is greater or equal to the second
virtual gpos::BOOL IsGreaterThanOrEqual(const IDatum *datum1,
const IDatum *datum2) const = 0;
};
} // namespace gpopt
#endif // !GPOPT_IComparator_H
// EOF
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