greenplumn CDXLWindowKey 源码
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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