greenplumn CMDIdRelStats 源码

greenplumn CMDIdRelStats 代码

文件路径：/src/backend/gporca/libnaucrates/src/md/CMDIdRelStats.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CMDIdRelStats.cpp
//
//	@doc:
//		Implementation of mdids for relation statistics
//---------------------------------------------------------------------------


#include "naucrates/md/CMDIdRelStats.h"

#include "naucrates/dxl/xml/CXMLSerializer.h"

using namespace gpos;
using namespace gpmd;

//---------------------------------------------------------------------------
//	@function:
//		CMDIdRelStats::CMDIdRelStats
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CMDIdRelStats::CMDIdRelStats(CMDIdGPDB *rel_mdid)
	: m_rel_mdid(rel_mdid), m_str(m_mdid_array, GPOS_ARRAY_SIZE(m_mdid_array))
{
	// serialize mdid into static string
	Serialize();
}

//---------------------------------------------------------------------------
//	@function:
//		CMDIdRelStats::~CMDIdRelStats
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------
CMDIdRelStats::~CMDIdRelStats()
{
	m_rel_mdid->Release();
}

//---------------------------------------------------------------------------
//	@function:
//		CMDIdRelStats::Serialize
//
//	@doc:
//		Serialize mdid into static string
//
//---------------------------------------------------------------------------
void
CMDIdRelStats::Serialize()
{
	// serialize mdid as SystemType.Oid.Major.Minor
	m_str.AppendFormat(GPOS_WSZ_LIT("%d.%d.%d.%d"), MdidType(),
					   m_rel_mdid->Oid(), m_rel_mdid->VersionMajor(),
					   m_rel_mdid->VersionMinor());
}

//---------------------------------------------------------------------------
//	@function:
//		CMDIdRelStats::GetBuffer
//
//	@doc:
//		Returns the string representation of the mdid
//
//---------------------------------------------------------------------------
const WCHAR *
CMDIdRelStats::GetBuffer() const
{
	return m_str.GetBuffer();
}

//---------------------------------------------------------------------------
//	@function:
//		CMDIdRelStats::GetRelMdId
//
//	@doc:
//		Returns the base relation id
//
//---------------------------------------------------------------------------
IMDId *
CMDIdRelStats::GetRelMdId() const
{
	return m_rel_mdid;
}

//---------------------------------------------------------------------------
//	@function:
//		CMDIdRelStats::Equals
//
//	@doc:
//		Checks if the mdids are equal
//
//---------------------------------------------------------------------------
BOOL
CMDIdRelStats::Equals(const IMDId *mdid) const
{
	if (nullptr == mdid || EmdidRelStats != mdid->MdidType())
	{
		return false;
	}

	const CMDIdRelStats *rel_stats_mdid = CMDIdRelStats::CastMdid(mdid);

	return m_rel_mdid->Equals(rel_stats_mdid->GetRelMdId());
}

//---------------------------------------------------------------------------
//	@function:
//		CMDIdRelStats::Serialize
//
//	@doc:
//		Serializes the mdid as the value of the given attribute
//
//---------------------------------------------------------------------------
void
CMDIdRelStats::Serialize(CXMLSerializer *xml_serializer,
						 const CWStringConst *attribute_str) const
{
	xml_serializer->AddAttribute(attribute_str, &m_str);
}

//---------------------------------------------------------------------------
//	@function:
//		CMDIdRelStats::OsPrint
//
//	@doc:
//		Debug print of the id in the provided stream
//
//---------------------------------------------------------------------------
IOstream &
CMDIdRelStats::OsPrint(IOstream &os) const
{
	os << "(" << m_str.GetBuffer() << ")";
	return os;
}

// EOF

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