greenplumn CMDIdColStats 代码
文件路径：/src/backend/gporca/libnaucrates/src/md/CMDIdColStats.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CMDIdColStats.cpp
/
/ @doc:
/ Implementation of mdids for column statistics
/---------------------------------------------------------------------------
#include "naucrates/md/CMDIdColStats.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::CMDIdColStats
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CMDIdColStats::CMDIdColStats(CMDIdGPDB *rel_mdid, ULONG pos)
: m_rel_mdid(rel_mdid),
m_attr_pos(pos),
m_str(m_mdid_buffer, GPOS_ARRAY_SIZE(m_mdid_buffer))
{
GPOS_ASSERT(rel_mdid->IsValid());
/ serialize mdid into static string
Serialize();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::~CMDIdColStats
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CMDIdColStats::~CMDIdColStats()
{
m_rel_mdid->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::Serialize
/
/ @doc:
/ Serialize mdid into static string
/
/---------------------------------------------------------------------------
void
CMDIdColStats::Serialize()
{
/ serialize mdid as SystemType.Oid.Major.Minor.Attno
m_str.AppendFormat(GPOS_WSZ_LIT("%d.%d.%d.%d.%d"), MdidType(),
m_rel_mdid->Oid(), m_rel_mdid->VersionMajor(),
m_rel_mdid->VersionMinor(), m_attr_pos);
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::GetBuffer
/
/ @doc:
/ Returns the string representation of the mdid
/
/---------------------------------------------------------------------------
const WCHAR *
CMDIdColStats::GetBuffer() const
{
return m_str.GetBuffer();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::GetRelMdId
/
/ @doc:
/ Returns the base relation id
/
/---------------------------------------------------------------------------
IMDId *
CMDIdColStats::GetRelMdId() const
{
return m_rel_mdid;
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::Position
/
/ @doc:
/ Returns the attribute number
/
/---------------------------------------------------------------------------
ULONG
CMDIdColStats::Position() const
{
return m_attr_pos;
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::Equals
/
/ @doc:
/ Checks if the mdids are equal
/
/---------------------------------------------------------------------------
BOOL
CMDIdColStats::Equals(const IMDId *mdid) const
{
if (nullptr == mdid || EmdidColStats != mdid->MdidType())
{
return false;
}
const CMDIdColStats *mdid_col_stats = CMDIdColStats::CastMdid(mdid);
return m_rel_mdid->Equals(mdid_col_stats->GetRelMdId()) &&
m_attr_pos == mdid_col_stats->Position();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::Serialize
/
/ @doc:
/ Serializes the mdid as the value of the given attribute
/
/---------------------------------------------------------------------------
void
CMDIdColStats::Serialize(CXMLSerializer *xml_serializer,
const CWStringConst *attribute_str) const
{
xml_serializer->AddAttribute(attribute_str, &m_str);
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdColStats::OsPrint
/
/ @doc:
/ Debug print of the id in the provided stream
/
/---------------------------------------------------------------------------
IOstream &
CMDIdColStats::OsPrint(IOstream &os) const
{
os << "(" << m_str.GetBuffer() << ")";
return os;
}
/ EOF
相关信息
相关文章
greenplumn CDXLStatsDerivedColumn 源码
greenplumn CDXLStatsDerivedRelation 源码
greenplumn CMDAggregateGPDB 源码
greenplumn CMDArrayCoerceCastGPDB 源码