greenplumn CDXLScalarSortCol 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarSortCol.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarSortCol.cpp
/
/ @doc:
/ Implementation of DXL sorting columns for sort and motion operator nodes
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLScalarSortCol.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::CDXLScalarSortCol
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CDXLScalarSortCol::CDXLScalarSortCol(CMemoryPool *mp, ULONG colid,
IMDId *mdid_sort_op,
CWStringConst *sort_op_name_str,
BOOL sort_nulls_first)
: CDXLScalar(mp),
m_colid(colid),
m_mdid_sort_op(mdid_sort_op),
m_sort_op_name_str(sort_op_name_str),
m_must_sort_nulls_first(sort_nulls_first)
{
GPOS_ASSERT(m_mdid_sort_op->IsValid());
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::~CDXLScalarSortCol
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CDXLScalarSortCol::~CDXLScalarSortCol()
{
m_mdid_sort_op->Release();
GPOS_DELETE(m_sort_op_name_str);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::GetDXLOperator
/
/ @doc:
/ Operator type
/
/---------------------------------------------------------------------------
Edxlopid
CDXLScalarSortCol::GetDXLOperator() const
{
return EdxlopScalarSortCol;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::GetOpNameStr
/
/ @doc:
/ Operator name
/
/---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarSortCol::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenScalarSortCol);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::GetColId
/
/ @doc:
/ Id of the sorting column
/
/---------------------------------------------------------------------------
ULONG
CDXLScalarSortCol::GetColId() const
{
return m_colid;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::GetMdIdSortOp
/
/ @doc:
/ Oid of the sorting operator for the column from the catalog
/
/---------------------------------------------------------------------------
IMDId *
CDXLScalarSortCol::GetMdIdSortOp() const
{
return m_mdid_sort_op;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::IsSortedNullsFirst
/
/ @doc:
/ Whether nulls are sorted before other values
/
/---------------------------------------------------------------------------
BOOL
CDXLScalarSortCol::IsSortedNullsFirst() const
{
return m_must_sort_nulls_first;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLScalarSortCol::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode * / dxlnode
) const
{
const CWStringConst *element_name = GetOpNameStr();
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
xml_serializer->AddAttribute(CDXLTokens::GetDXLTokenStr(EdxltokenColId),
m_colid);
m_mdid_sort_op->Serialize(xml_serializer,
CDXLTokens::GetDXLTokenStr(EdxltokenSortOpId));
xml_serializer->AddAttribute(
CDXLTokens::GetDXLTokenStr(EdxltokenSortOpName), m_sort_op_name_str);
xml_serializer->AddAttribute(
CDXLTokens::GetDXLTokenStr(EdxltokenSortNullsFirst),
m_must_sort_nulls_first);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
#ifdef GPOS_DEBUG
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSortCol::AssertValid
/
/ @doc:
/ Checks whether operator node is well-structured
/
/---------------------------------------------------------------------------
void
CDXLScalarSortCol::AssertValid(const CDXLNode *dxlnode,
BOOL / validate_children
) const
{
GPOS_ASSERT(0 == dxlnode->Arity());
}
#endif / GPOS_DEBUG
/ EOF
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