greenplumn CDXLColDescr 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLColDescr.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CDXLColDescr.cpp
/
/ @doc:
/ Implementation of DXL column descriptors
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLColDescr.h"
#include "gpos/string/CWStringDynamic.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
#include "naucrates/md/CMDIdGPDB.h"
using namespace gpos;
using namespace gpdxl;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::CDXLColDescr
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CDXLColDescr::CDXLColDescr(CMDName *md_name, ULONG column_id, INT attr_no,
IMDId *column_mdid_type, INT type_modifier,
BOOL is_dropped, ULONG width)
: m_md_name(md_name),
m_column_id(column_id),
m_attr_no(attr_no),
m_column_mdid_type(column_mdid_type),
m_type_modifier(type_modifier),
m_is_dropped(is_dropped),
m_column_width(width)
{
GPOS_ASSERT_IMP(m_is_dropped, 0 == m_md_name->GetMDName()->Length());
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::~CDXLColDescr
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CDXLColDescr::~CDXLColDescr()
{
m_column_mdid_type->Release();
GPOS_DELETE(m_md_name);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::MdName
/
/ @doc:
/ Returns the column name
/
/---------------------------------------------------------------------------
const CMDName *
CDXLColDescr::MdName() const
{
return m_md_name;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::Id
/
/ @doc:
/ Returns the column Id
/
/---------------------------------------------------------------------------
ULONG
CDXLColDescr::Id() const
{
return m_column_id;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::AttrNum
/
/ @doc:
/ Returns the column attribute number in GPDB
/
/---------------------------------------------------------------------------
INT
CDXLColDescr::AttrNum() const
{
return m_attr_no;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::MdidType
/
/ @doc:
/ Returns the type id for this column
/
/---------------------------------------------------------------------------
IMDId *
CDXLColDescr::MdidType() const
{
return m_column_mdid_type;
}
INT
CDXLColDescr::TypeModifier() const
{
return m_type_modifier;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::IsDropped
/
/ @doc:
/ Is the column dropped from the relation
/
/---------------------------------------------------------------------------
BOOL
CDXLColDescr::IsDropped() const
{
return m_is_dropped;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::Width
/
/ @doc:
/ Returns the width of the column
/
/---------------------------------------------------------------------------
ULONG
CDXLColDescr::Width() const
{
return m_column_width;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLColDescr::SerializeToDXL
/
/ @doc:
/ Serializes the column descriptor into DXL format
/
/---------------------------------------------------------------------------
void
CDXLColDescr::SerializeToDXL(CXMLSerializer *xml_serializer) const
{
const CWStringConst *pstrTokenColDescr =
CDXLTokens::GetDXLTokenStr(EdxltokenColDescr);
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix),
pstrTokenColDescr);
xml_serializer->AddAttribute(CDXLTokens::GetDXLTokenStr(EdxltokenColId),
m_column_id);
xml_serializer->AddAttribute(CDXLTokens::GetDXLTokenStr(EdxltokenAttno),
m_attr_no);
xml_serializer->AddAttribute(CDXLTokens::GetDXLTokenStr(EdxltokenColName),
m_md_name->GetMDName());
m_column_mdid_type->Serialize(xml_serializer,
CDXLTokens::GetDXLTokenStr(EdxltokenTypeId));
if (default_type_modifier != TypeModifier())
{
xml_serializer->AddAttribute(
CDXLTokens::GetDXLTokenStr(EdxltokenTypeMod), TypeModifier());
}
if (m_is_dropped)
{
xml_serializer->AddAttribute(
CDXLTokens::GetDXLTokenStr(EdxltokenColDropped), m_is_dropped);
}
if (gpos::ulong_max != m_column_width)
{
xml_serializer->AddAttribute(
CDXLTokens::GetDXLTokenStr(EdxltokenColWidth), m_column_width);
}
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix),
pstrTokenColDescr);
GPOS_CHECK_ABORT;
}
/ EOF
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