greenplumn IMDTypeOid 源码
greenplumn IMDTypeOid 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/IMDTypeOid.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// IMDTypeOid.h
//
// @doc:
// Interface for OID types in the metadata cache
//---------------------------------------------------------------------------
#ifndef GPMD_IMDTypeOid_H
#define GPMD_IMDTypeOid_H
#include "gpos/base.h"
#include "naucrates/md/IMDType.h"
// fwd decl
namespace gpnaucrates
{
class IDatumOid;
}
namespace gpmd
{
using namespace gpos;
using namespace gpnaucrates;
//---------------------------------------------------------------------------
// @class:
// IMDTypeOid
//
// @doc:
// Interface for OID types in the metadata cache
//
//---------------------------------------------------------------------------
class IMDTypeOid : public IMDType
{
public:
// type id
static ETypeInfo
GetTypeInfo()
{
return EtiOid;
}
ETypeInfo
GetDatumType() const override
{
return IMDTypeOid::GetTypeInfo();
}
// factory function for OID datums
virtual IDatumOid *CreateOidDatum(CMemoryPool *mp, OID oid_value,
BOOL is_null) const = 0;
};
} // namespace gpmd
#endif // !GPMD_IMDTypeOid_H
// EOF
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