greenplumn IBucket 源码
greenplumn IBucket 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/statistics/IBucket.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// IBucket.h
//
// @doc:
// Simple bucket interface
//---------------------------------------------------------------------------
#ifndef GPNAUCRATES_IBucket_H
#define GPNAUCRATES_IBucket_H
#include "gpos/base.h"
#include "naucrates/statistics/CPoint.h"
namespace gpnaucrates
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// IBucket
//
// @doc:
// Simple bucket interface. Has a lower point and upper point
//
//---------------------------------------------------------------------------
class IBucket
{
private:
public:
IBucket &operator=(const IBucket &) = delete;
IBucket(const IBucket &) = delete;
// c'tor
IBucket() = default;
// lower point
virtual CPoint *GetLowerBound() const = 0;
// upper point
virtual CPoint *GetUpperBound() const = 0;
// is bucket singleton?
BOOL
IsSingleton() const
{
return GetLowerBound()->Equals(GetUpperBound());
}
// d'tor
virtual ~IBucket() = default;
};
} // namespace gpnaucrates
#endif // !GPNAUCRATES_IBucket_H
// EOF
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