greenplumn CMDProviderGeneric 代码
文件路径：/src/backend/gporca/libnaucrates/src/md/CMDProviderGeneric.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CMDProviderGeneric.cpp
/
/ @doc:
/ Implementation of a generic MD provider.
/---------------------------------------------------------------------------
#include "naucrates/md/CMDProviderGeneric.h"
#include "gpos/error/CAutoTrace.h"
#include "gpos/io/COstreamString.h"
#include "gpos/memory/CMemoryPool.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/exception.h"
#include "naucrates/md/CDXLColStats.h"
#include "naucrates/md/CDXLRelStats.h"
#include "naucrates/md/CMDTypeBoolGPDB.h"
#include "naucrates/md/CMDTypeInt2GPDB.h"
#include "naucrates/md/CMDTypeInt4GPDB.h"
#include "naucrates/md/CMDTypeInt8GPDB.h"
using namespace gpdxl;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @function:
/ CMDProviderGeneric::CMDProviderGeneric
/
/ @doc:
/ Constructs a file-based metadata provider
/
/---------------------------------------------------------------------------
CMDProviderGeneric::CMDProviderGeneric(CMemoryPool *mp)
{
/ TODO: - Jan 25, 2012; those should not be tied to a particular system
m_mdid_int2 = GPOS_NEW(mp) CMDIdGPDB(GPDB_INT2);
m_mdid_int4 = GPOS_NEW(mp) CMDIdGPDB(GPDB_INT4);
m_mdid_int8 = GPOS_NEW(mp) CMDIdGPDB(GPDB_INT8);
m_mdid_bool = GPOS_NEW(mp) CMDIdGPDB(GPDB_BOOL);
m_mdid_oid = GPOS_NEW(mp) CMDIdGPDB(GPDB_OID);
}
/---------------------------------------------------------------------------
/ @function:
/ CMDProviderGeneric::~CMDProviderGeneric
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CMDProviderGeneric::~CMDProviderGeneric()
{
m_mdid_int2->Release();
m_mdid_int4->Release();
m_mdid_int8->Release();
m_mdid_bool->Release();
m_mdid_oid->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDProviderGeneric::MDId
/
/ @doc:
/ return the mdid of a requested type
/
/---------------------------------------------------------------------------
IMDId *
CMDProviderGeneric::MDId(IMDType::ETypeInfo type_info) const
{
GPOS_ASSERT(IMDType::EtiGeneric > type_info);
switch (type_info)
{
case IMDType::EtiInt2:
return m_mdid_int2;
case IMDType::EtiInt4:
return m_mdid_int4;
case IMDType::EtiInt8:
return m_mdid_int8;
case IMDType::EtiBool:
return m_mdid_bool;
case IMDType::EtiOid:
return m_mdid_oid;
default:
return nullptr;
}
}
/---------------------------------------------------------------------------
/ @function:
/ CMDProviderGeneric::SysidDefault
/
/ @doc:
/ Get the default system id of the MD provider
/
/---------------------------------------------------------------------------
CSystemId
CMDProviderGeneric::SysidDefault()
{
return CSystemId(IMDId::EmdidGPDB, GPMD_GPDB_SYSID);
}
/ EOF
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