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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