greenplumn IMDTypeInt4 源码
greenplumn IMDTypeInt4 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/IMDTypeInt4.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// IMDTypeInt4.h
//
// @doc:
// Interface for INT4 types in the metadata cache
//---------------------------------------------------------------------------
#ifndef GPMD_IMDTypeInt4_H
#define GPMD_IMDTypeInt4_H
#include "gpos/base.h"
#include "naucrates/md/IMDType.h"
// fwd decl
namespace gpnaucrates
{
class IDatumInt4;
}
namespace gpmd
{
using namespace gpos;
using namespace gpnaucrates;
//---------------------------------------------------------------------------
// @class:
// IMDTypeInt4
//
// @doc:
// Interface for INT4 types in the metadata cache
//
//---------------------------------------------------------------------------
class IMDTypeInt4 : public IMDType
{
public:
// type id
static ETypeInfo
GetTypeInfo()
{
return EtiInt4;
}
ETypeInfo
GetDatumType() const override
{
return IMDTypeInt4::GetTypeInfo();
}
// factory function for INT4 datums
virtual IDatumInt4 *CreateInt4Datum(CMemoryPool *mp, INT value,
BOOL is_null) const = 0;
};
} // namespace gpmd
#endif // !GPMD_IMDTypeInt4_H
// EOF
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