greenplumn CMDProviderGeneric 源码
greenplumn CMDProviderGeneric 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/CMDProviderGeneric.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CMDProviderGeneric.h
//
// @doc:
// Provider of system-independent metadata objects.
//---------------------------------------------------------------------------
#ifndef GPMD_CMDProviderGeneric_H
#define GPMD_CMDProviderGeneric_H
#include "gpos/base.h"
#include "naucrates/md/IMDId.h"
#include "naucrates/md/IMDType.h"
#define GPMD_DEFAULT_SYSID GPOS_WSZ_LIT("GPDB")
namespace gpmd
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CMDProviderGeneric
//
// @doc:
// Provider of system-independent metadata objects.
//
//---------------------------------------------------------------------------
class CMDProviderGeneric
{
private:
// mdid of int2
IMDId *m_mdid_int2;
// mdid of int4
IMDId *m_mdid_int4;
// mdid of int8
IMDId *m_mdid_int8;
// mdid of bool
IMDId *m_mdid_bool;
// mdid of oid
IMDId *m_mdid_oid;
public:
CMDProviderGeneric(const CMDProviderGeneric &) = delete;
// ctor/dtor
CMDProviderGeneric(CMemoryPool *mp);
// dtor
~CMDProviderGeneric();
// return the mdid for the requested type
IMDId *MDId(IMDType::ETypeInfo type_info) const;
// default system id
static CSystemId SysidDefault();
};
} // namespace gpmd
#endif // !GPMD_CMDProviderGeneric_H
// EOF
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