greenplumn CDXLRelStats 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/CDXLRelStats.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLRelStats.h
/
/ @doc:
/ Class representing relation stats
/---------------------------------------------------------------------------
#ifndef GPMD_CDXLRelStats_H
#define GPMD_CDXLRelStats_H
#include "gpos/base.h"
#include "gpos/common/CDouble.h"
#include "gpos/string/CWStringDynamic.h"
#include "naucrates/md/CMDIdRelStats.h"
#include "naucrates/md/IMDRelStats.h"
namespace gpdxl
{
class CXMLSerializer;
}
namespace gpmd
{
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @class:
/ CDXLRelStats
/
/ @doc:
/ Class representing relation stats
/
/---------------------------------------------------------------------------
class CDXLRelStats : public IMDRelStats
{
private:
/ memory pool
CMemoryPool *m_mp;
/ metadata id of the object
CMDIdRelStats *m_rel_stats_mdid;
/ table name
CMDName *m_mdname;
/ number of rows
CDouble m_rows;
/ flag to indicate if input relation is empty
BOOL m_empty;
/ DXL string for object
CWStringDynamic *m_dxl_str;
/ number of blocks (not always up to-to-date)
ULONG m_relpages;
/ number of all-visible blocks (not always up-to-date)
ULONG m_relallvisible;
public:
CDXLRelStats(const CDXLRelStats &) = delete;
CDXLRelStats(CMemoryPool *mp, CMDIdRelStats *rel_stats_mdid,
CMDName *mdname, CDouble rows, BOOL is_empty, ULONG relpages,
ULONG relallvisible);
~CDXLRelStats() override;
/ the metadata id
IMDId *MDId() const override;
/ relation name
CMDName Mdname() const override;
/ DXL string representation of cache object
const CWStringDynamic *GetStrRepr() const override;
/ number of rows
CDouble Rows() const override;
/ number of blocks (not always up to-to-date)
ULONG
RelPages() const override
{
return m_relpages;
}
/ number of all-visible blocks (not always up-to-date)
ULONG
RelAllVisible() const override
{
return m_relallvisible;
}
/ is statistics on an empty input
BOOL
IsEmpty() const override
{
return m_empty;
}
/ serialize relation stats in DXL format given a serializer object
void Serialize(gpdxl::CXMLSerializer *) const override;
#ifdef GPOS_DEBUG
/ debug print of the metadata relation
void DebugPrint(IOstream &os) const override;
#endif
/ dummy relstats
static CDXLRelStats *CreateDXLDummyRelStats(CMemoryPool *mp, IMDId *mdid);
};
} / namespace gpmd
#endif / !GPMD_CDXLRelStats_H
/ EOF
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