greenplumn CDXLColDescr 源码

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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