greenplumn CMDKey 源码
greenplumn CMDKey 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/mdcache/CMDKey.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CMDKey.h
//
// @doc:
// Key for metadata objects in the cache
//---------------------------------------------------------------------------
#ifndef GPOPT_CMDKey_H
#define GPOPT_CMDKey_H
#include "gpos/base.h"
#include "gpos/string/CWStringConst.h"
#include "naucrates/md/IMDId.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CMDKey
//
// @doc:
// Key for metadata objects in the cache
//
//---------------------------------------------------------------------------
class CMDKey
{
private:
// id of the object in the underlying source
const IMDId *m_mdid;
public:
// ctors
explicit CMDKey(const IMDId *mdid);
// dtor
~CMDKey() = default;
const IMDId *
MDId() const
{
return m_mdid;
}
// equality function
BOOL Equals(const CMDKey &mdkey) const;
// hash function
ULONG HashValue() const;
// equality function for using MD keys in a cache
static BOOL FEqualMDKey(CMDKey *const &pvLeft, CMDKey *const &pvRight);
// hash function for using MD keys in a cache
static ULONG UlHashMDKey(CMDKey *const &pv);
};
} // namespace gpopt
#endif // !GPOPT_CMDKey_H
// EOF
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