greenplumn CMDKey 代码
文件路径：/src/backend/gporca/libgpopt/src/mdcache/CMDKey.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CMDKey.cpp
/
/ @doc:
/ Implementation of a key for metadata cache objects
/---------------------------------------------------------------------------
#include "gpopt/mdcache/CMDKey.h"
#include "gpos/io/COstreamString.h"
#include "naucrates/dxl/CDXLUtils.h"
using namespace gpos;
using namespace gpmd;
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CMDKey::CMDKey
/
/ @doc:
/ Constructs a md cache key
/
/---------------------------------------------------------------------------
CMDKey::CMDKey(const IMDId *mdid) : m_mdid(mdid)
{
GPOS_ASSERT(mdid->IsValid());
}
/---------------------------------------------------------------------------
/ @function:
/ CMDKey::Equals
/
/ @doc:
/ Equality function
/
/---------------------------------------------------------------------------
BOOL
CMDKey::Equals(const CMDKey &mdkey) const
{
return mdkey.MDId()->Equals(m_mdid);
}
/---------------------------------------------------------------------------
/ @function:
/ CMDKey::FEqualMDKey
/
/ @doc:
/ Equality function for using MD keys in a cache
/
/---------------------------------------------------------------------------
BOOL
CMDKey::FEqualMDKey(CMDKey *const &pvLeft, CMDKey *const &pvRight)
{
if (nullptr == pvLeft && nullptr == pvRight)
{
return true;
}
if (nullptr == pvLeft || nullptr == pvRight)
{
return false;
}
GPOS_ASSERT(nullptr != pvLeft && nullptr != pvRight);
return pvLeft->MDId()->Equals(pvRight->MDId());
}
/---------------------------------------------------------------------------
/ @function:
/ CMDKey::HashValue
/
/ @doc:
/ Hash function
/
/---------------------------------------------------------------------------
ULONG
CMDKey::HashValue() const
{
return m_mdid->HashValue();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDKey::UlHashMDKey
/
/ @doc:
/ Hash function for using MD keys in a cache
/
/---------------------------------------------------------------------------
ULONG
CMDKey::UlHashMDKey(CMDKey *const &pv)
{
return pv->MDId()->HashValue();
}
/ EOF