greenplumn CMDProviderRelcache 源码

2022-08-18
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greenplumn CMDProviderRelcache 代码

文件路径：/src/backend/gpopt/relcache/CMDProviderRelcache.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CMDProviderRelcache.cpp
//
//	@doc:
//		Implementation of a relcache-based metadata provider, which uses GPDB's
//		relcache to lookup objects given their ids.
//
//	@test:
//
//
//---------------------------------------------------------------------------

extern "C" {
#include "postgres.h"
}
#include "gpopt/mdcache/CMDAccessor.h"
#include "gpopt/relcache/CMDProviderRelcache.h"
#include "gpopt/translate/CTranslatorRelcacheToDXL.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/exception.h"

using namespace gpos;
using namespace gpdxl;
using namespace gpmd;

//---------------------------------------------------------------------------
//	@function:
//		CMDProviderRelcache::CMDProviderRelcache
//
//	@doc:
//		Constructs a file-based metadata provider
//
//---------------------------------------------------------------------------
CMDProviderRelcache::CMDProviderRelcache(CMemoryPool *mp) : m_mp(mp)
{
	GPOS_ASSERT(nullptr != m_mp);
}

//---------------------------------------------------------------------------
//	@function:
//		CMDProviderRelcache::GetMDObjDXLStr
//
//	@doc:
//		Returns the DXL of the requested object in the provided memory pool
//
//---------------------------------------------------------------------------
CWStringBase *
CMDProviderRelcache::GetMDObjDXLStr(CMemoryPool *mp, CMDAccessor *md_accessor,
									IMDId *md_id) const
{
	IMDCacheObject *md_obj =
		CTranslatorRelcacheToDXL::RetrieveObject(mp, md_accessor, md_id);

	GPOS_ASSERT(nullptr != md_obj);

	CWStringDynamic *str = CDXLUtils::SerializeMDObj(
		m_mp, md_obj, true /*fSerializeHeaders*/, false /*findent*/);

	// cleanup DXL object
	md_obj->Release();

	return str;
}

// return the requested metadata object
IMDCacheObject *
CMDProviderRelcache::GetMDObj(CMemoryPool *mp, CMDAccessor *md_accessor,
							  IMDId *mdid) const
{
	IMDCacheObject *md_obj =
		CTranslatorRelcacheToDXL::RetrieveObject(mp, md_accessor, mdid);
	GPOS_ASSERT(nullptr != md_obj);

	return md_obj;
}

// EOF

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本文标签： greenplum
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