greenplumn CDatumOidGPDB 源码
greenplumn CDatumOidGPDB 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/base/CDatumOidGPDB.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDatumOidGPDB.h
//
// @doc:
// GPDB-specific oid representation
//---------------------------------------------------------------------------
#ifndef GPNAUCRATES_CDatumOidGPDB_H
#define GPNAUCRATES_CDatumOidGPDB_H
#include "gpos/base.h"
#include "naucrates/base/IDatumOid.h"
namespace gpnaucrates
{
//---------------------------------------------------------------------------
// @class:
// CDatumOidGPDB
//
// @doc:
// GPDB-specific oid representation
//
//---------------------------------------------------------------------------
class CDatumOidGPDB : public IDatumOid
{
private:
// type information
IMDId *m_mdid;
// oid value
OID m_val;
// is null
BOOL m_is_null;
public:
CDatumOidGPDB(const CDatumOidGPDB &) = delete;
// ctors
CDatumOidGPDB(CSystemId sysid, OID oid_val, BOOL is_null = false);
CDatumOidGPDB(IMDId *mdid, OID oid_val, BOOL is_null = false);
// dtor
~CDatumOidGPDB() override;
// accessor of metadata type id
IMDId *MDId() const override;
// accessor of size
ULONG Size() const override;
// accessor of oid value
OID OidValue() const override;
// accessor of is null
BOOL IsNull() const override;
// return string representation
const CWStringConst *GetStrRepr(CMemoryPool *mp) const override;
// hash function
ULONG HashValue() const override;
// match function for datums
BOOL Matches(const IDatum *) const override;
// copy datum
IDatum *MakeCopy(CMemoryPool *mp) const override;
// print function
IOstream &OsPrint(IOstream &os) const override;
}; // class CDatumOidGPDB
} // namespace gpnaucrates
#endif // !GPNAUCRATES_CDatumOidGPDB_H
// EOF
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