greenplumn CDXLScalarSubquery 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarSubquery.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC, Corp.
/
/ @filename:
/ CDXLScalarSubquery.cpp
/
/ @doc:
/ Implementation of subqueries computing scalar values
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLScalarSubquery.h"
#include "gpos/string/CWStringDynamic.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSubquery::CDXLScalarSubquery
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CDXLScalarSubquery::CDXLScalarSubquery(CMemoryPool *mp, ULONG colid)
: CDXLScalar(mp), m_colid(colid)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSubquery::~CDXLScalarSubquery
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CDXLScalarSubquery::~CDXLScalarSubquery() = default;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSubquery::GetDXLOperator
/
/ @doc:
/ Operator type
/
/---------------------------------------------------------------------------
Edxlopid
CDXLScalarSubquery::GetDXLOperator() const
{
return EdxlopScalarSubquery;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSubquery::GetOpNameStr
/
/ @doc:
/ Operator name
/
/---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarSubquery::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenScalarSubquery);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSubquery::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLScalarSubquery::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const
{
const CWStringConst *element_name = GetOpNameStr();
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
/ serialize computed column id
xml_serializer->AddAttribute(CDXLTokens::GetDXLTokenStr(EdxltokenColId),
m_colid);
dxlnode->SerializeChildrenToDXL(xml_serializer);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
#ifdef GPOS_DEBUG
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarSubquery::AssertValid
/
/ @doc:
/ Checks whether operator node is well-structured
/
/---------------------------------------------------------------------------
void
CDXLScalarSubquery::AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const
{
GPOS_ASSERT(1 == dxlnode->Arity());
CDXLNode *child_dxlnode = (*dxlnode)[0];
GPOS_ASSERT(EdxloptypeLogical ==
child_dxlnode->GetOperator()->GetDXLOperatorType());
dxlnode->AssertValid(validate_children);
}
#endif / GPOS_DEBUG
/ EOF
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