greenplumn CMDIdGPDB 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/CMDIdGPDB.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CMDIdGPDB.h
/
/ @doc:
/ Class for representing id and version of metadata objects in GPDB
/---------------------------------------------------------------------------
#ifndef GPMD_CMDIdGPDB_H
#define GPMD_CMDIdGPDB_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpos/string/CWStringConst.h"
#include "naucrates/dxl/gpdb_types.h"
#include "naucrates/md/CSystemId.h"
#include "naucrates/md/IMDId.h"
/ TODO: - Feb 1, 2012; remove once system id is part of the mdid
#define GPMD_GPDB_SYSID GPOS_WSZ_LIT("GPDB")
namespace gpmd
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CMDIdGPDB
/
/ @doc:
/ Class for representing ids of GPDB metadata objects
/
/---------------------------------------------------------------------------
class CMDIdGPDB : public IMDId
{
protected:
/ source system id
CSystemId m_sysid;
/ id from GPDB system catalog
OID m_oid;
/ major version number
ULONG m_major_version;
/ minor version number
ULONG m_minor_version;
/ buffer for the serialized mdid
WCHAR m_mdid_array[GPDXL_MDID_LENGTH];
/ string representation of the mdid
CWStringStatic m_str;
/ serialize mdid
virtual void Serialize();
public:
/ ctors
CMDIdGPDB(CSystemId sysid, OID oid);
explicit CMDIdGPDB(OID oid);
CMDIdGPDB(OID oid, ULONG version_major, ULONG version_minor);
/ copy ctor
explicit CMDIdGPDB(const CMDIdGPDB &mdidSource);
EMDIdType
MdidType() const override
{
return EmdidGPDB;
}
/ string representation of mdid
const WCHAR *GetBuffer() const override;
/ source system id
CSystemId
Sysid() const override
{
return m_sysid;
}
/ oid
virtual OID Oid() const;
/ major version
virtual ULONG VersionMajor() const;
/ minor version
virtual ULONG VersionMinor() const;
/ equality check
BOOL Equals(const IMDId *mdid) const override;
/ computes the hash value for the metadata id
ULONG
HashValue() const override
{
return gpos::CombineHashes(
MdidType(),
gpos::CombineHashes(
gpos::HashValue(&m_oid),
gpos::CombineHashes(gpos::HashValue(&m_major_version),
gpos::HashValue(&m_minor_version))));
}
/ is the mdid valid
BOOL IsValid() const override;
/ serialize mdid in DXL as the value of the specified attribute
void Serialize(CXMLSerializer *xml_serializer,
const CWStringConst *pstrAttribute) const override;
/ debug print of the metadata id
IOstream &OsPrint(IOstream &os) const override;
/ const converter
static const CMDIdGPDB *
CastMdid(const IMDId *mdid)
{
GPOS_ASSERT(nullptr != mdid && EmdidGPDB == mdid->MdidType());
return dynamic_cast<const CMDIdGPDB *>(mdid);
}
/ non-const converter
static CMDIdGPDB *
CastMdid(IMDId *mdid)
{
GPOS_ASSERT(nullptr != mdid && (EmdidGPDB == mdid->MdidType() ||
EmdidGPDBCtas == mdid->MdidType()));
return dynamic_cast<CMDIdGPDB *>(mdid);
}
IMDId *
Copy(CMemoryPool *mp) const override
{
return GPOS_NEW(mp) CMDIdGPDB(*this);
}
/ invalid mdid
static CMDIdGPDB m_mdid_invalid_key;
/ int2 mdid
static CMDIdGPDB m_mdid_int2;
/ int4 mdid
static CMDIdGPDB m_mdid_int4;
/ int8 mdid
static CMDIdGPDB m_mdid_int8;
/ oid mdid
static CMDIdGPDB m_mdid_oid;
/ bool mdid
static CMDIdGPDB m_mdid_bool;
/ numeric mdid
static CMDIdGPDB m_mdid_numeric;
/ date mdid
static CMDIdGPDB m_mdid_date;
/ time mdid
static CMDIdGPDB m_mdid_time;
/ time with time zone mdid
static CMDIdGPDB m_mdid_timeTz;
/ timestamp mdid
static CMDIdGPDB m_mdid_timestamp;
/ timestamp with time zone mdid
static CMDIdGPDB m_mdid_timestampTz;
/ absolute time mdid
static CMDIdGPDB m_mdid_abs_time;
/ relative time mdid
static CMDIdGPDB m_mdid_relative_time;
/ interval mdid
static CMDIdGPDB m_mdid_interval;
/ time interval mdid
static CMDIdGPDB m_mdid_time_interval;
/ char mdid
static CMDIdGPDB m_mdid_char;
/ bpchar mdid
static CMDIdGPDB m_mdid_bpchar;
/ varchar mdid
static CMDIdGPDB m_mdid_varchar;
/ text mdid
static CMDIdGPDB m_mdid_text;
/ name mdid
static CMDIdGPDB m_mdid_name;
/ float4 mdid
static CMDIdGPDB m_mdid_float4;
/ float8 mdid
static CMDIdGPDB m_mdid_float8;
/ cash mdid
static CMDIdGPDB m_mdid_cash;
/ inet mdid
static CMDIdGPDB m_mdid_inet;
/ cidr mdid
static CMDIdGPDB m_mdid_cidr;
/ macaddr mdid
static CMDIdGPDB m_mdid_macaddr;
/ count(*) mdid
static CMDIdGPDB m_mdid_count_star;
/ count(Any) mdid
static CMDIdGPDB m_mdid_count_any;
/ uuid mdid
static CMDIdGPDB m_mdid_uuid;
/ unknown datatype mdid
static CMDIdGPDB m_mdid_unknown;
};
} / namespace gpmd
#endif / !GPMD_CMDIdGPDB_H
/ EOF
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