greenplumn IMDTypeGeneric 源码
greenplumn IMDTypeGeneric 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/IMDTypeGeneric.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// IMDTypeGeneric.h
//
// @doc:
// Interface for types in the metadata cache
//---------------------------------------------------------------------------
#ifndef GPMD_IMDTypeGeneric_H
#define GPMD_IMDTypeGeneric_H
#include "gpos/base.h"
#include "naucrates/dxl/gpdb_types.h"
#include "naucrates/md/IMDType.h"
namespace gpmd
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// IMDTypeGeneric
//
// @doc:
// Interface for generic types in the metadata cache
//
//---------------------------------------------------------------------------
class IMDTypeGeneric : public IMDType
{
public:
// type id
static ETypeInfo
GetTypeInfo()
{
return EtiGeneric;
}
// type id
ETypeInfo
GetDatumType() const override
{
return IMDTypeGeneric::GetTypeInfo();
}
virtual IDatum *CreateGenericNullDatum(CMemoryPool *mp,
INT type_modifier) const = 0;
};
} // namespace gpmd
#endif // !GPMD_IMDTypeGeneric_H
// EOF
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