greenplumn CMDKey 源码

2022-08-18
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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

相关信息

greenplumn 源码目录

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greenplumn CMDAccessor 源码

greenplumn CMDAccessorUtils 源码

greenplumn CMDCache 源码

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所属分类： 大数据
本文标签： greenplum
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