greenplumn CMDIdRelStats 源码
greenplumn CMDIdRelStats 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/CMDIdRelStats.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CMDIdRelStats.h
//
// @doc:
// Class for representing mdids for relation statistics
//---------------------------------------------------------------------------
#ifndef GPMD_CMDIdRelStats_H
#define GPMD_CMDIdRelStats_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpos/string/CWStringConst.h"
#include "naucrates/dxl/gpdb_types.h"
#include "naucrates/md/CMDIdGPDB.h"
#include "naucrates/md/CSystemId.h"
namespace gpmd
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CMDIdRelStats
//
// @doc:
// Class for representing ids of relation stats objects
//
//---------------------------------------------------------------------------
class CMDIdRelStats : public IMDId
{
private:
// mdid of base relation
CMDIdGPDB *m_rel_mdid;
// buffer for the serialzied mdid
WCHAR m_mdid_array[GPDXL_MDID_LENGTH];
// string representation of the mdid
CWStringStatic m_str;
// serialize mdid
void Serialize();
public:
CMDIdRelStats(const CMDIdRelStats &) = delete;
// ctor
explicit CMDIdRelStats(CMDIdGPDB *rel_mdid);
// dtor
~CMDIdRelStats() override;
EMDIdType
MdidType() const override
{
return EmdidRelStats;
}
// string representation of mdid
const WCHAR *GetBuffer() const override;
// source system id
CSystemId
Sysid() const override
{
return m_rel_mdid->Sysid();
}
// accessors
IMDId *GetRelMdId() const;
// equality check
BOOL Equals(const IMDId *mdid) const override;
// computes the hash value for the metadata id
ULONG
HashValue() const override
{
return m_rel_mdid->HashValue();
}
// is the mdid valid
BOOL
IsValid() const override
{
return IMDId::IsValid(m_rel_mdid);
}
// serialize mdid in DXL as the value of the specified attribute
void Serialize(CXMLSerializer *xml_serializer,
const CWStringConst *attribute_str) const override;
// debug print of the metadata id
IOstream &OsPrint(IOstream &os) const override;
// const converter
static const CMDIdRelStats *
CastMdid(const IMDId *mdid)
{
GPOS_ASSERT(nullptr != mdid && EmdidRelStats == mdid->MdidType());
return dynamic_cast<const CMDIdRelStats *>(mdid);
}
// non-const converter
static CMDIdRelStats *
CastMdid(IMDId *mdid)
{
GPOS_ASSERT(nullptr != mdid && EmdidRelStats == mdid->MdidType());
return dynamic_cast<CMDIdRelStats *>(mdid);
}
// make a copy in the given memory pool
IMDId *
Copy(CMemoryPool *mp) const override
{
CMDIdGPDB *mdid_rel = CMDIdGPDB::CastMdid(m_rel_mdid->Copy(mp));
return GPOS_NEW(mp) CMDIdRelStats(mdid_rel);
}
};
} // namespace gpmd
#endif // !GPMD_CMDIdRelStats_H
// EOF
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