greenplumn CDXLWindowKey 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLWindowKey.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLWindowKey.cpp
/
/ @doc:
/ Implementation of DXL window key
/
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLWindowKey.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLWindowKey::CDXLWindowKey
/
/ @doc:
/ Constructs a scalar window key node
/
/---------------------------------------------------------------------------
CDXLWindowKey::CDXLWindowKey()
= default;
/---------------------------------------------------------------------------
/ @function:
/ CDXLWindowKey::~CDXLWindowKey
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CDXLWindowKey::~CDXLWindowKey()
{
CRefCount::SafeRelease(m_window_frame_dxl);
CRefCount::SafeRelease(m_sort_col_list_dxlnode);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLWindowKey::SetWindowFrame
/
/ @doc:
/ Set window frame
/
/---------------------------------------------------------------------------
void
CDXLWindowKey::SetWindowFrame(CDXLWindowFrame *window_frame)
{
/ allow setting window frame only once
GPOS_ASSERT(nullptr == m_window_frame_dxl);
m_window_frame_dxl = window_frame;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLWindowKey::SetSortColList
/
/ @doc:
/ Set sort column list
/
/---------------------------------------------------------------------------
void
CDXLWindowKey::SetSortColList(CDXLNode *sort_col_list_dxlnode)
{
/ allow setting window frame only once
GPOS_ASSERT(nullptr == m_sort_col_list_dxlnode);
m_sort_col_list_dxlnode = sort_col_list_dxlnode;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLWindowKey::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLWindowKey::SerializeToDXL(CXMLSerializer *xml_serializer) const
{
const CWStringConst *element_name =
CDXLTokens::GetDXLTokenStr(EdxltokenWindowKey);
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
if (nullptr != m_sort_col_list_dxlnode)
{
m_sort_col_list_dxlnode->SerializeToDXL(xml_serializer);
}
if (nullptr != m_window_frame_dxl)
{
m_window_frame_dxl->SerializeToDXL(xml_serializer);
}
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
/ EOF
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