greenplumn CDXLScalarLimitOffset 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarLimitOffset.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarLimitOffset.cpp
/
/ @doc:
/ Implementation of DXL Scalar Limit Offset
/
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLScalarLimitOffset.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarLimitOffset::CDXLScalarLimitOffset
/
/ @doc:
/ Constructs a scalar Limit Offset node
/
/---------------------------------------------------------------------------
CDXLScalarLimitOffset::CDXLScalarLimitOffset(CMemoryPool *mp) : CDXLScalar(mp)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarLimitOffset::GetDXLOperator
/
/ @doc:
/ Operator type
/
/---------------------------------------------------------------------------
Edxlopid
CDXLScalarLimitOffset::GetDXLOperator() const
{
return EdxlopScalarLimitOffset;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarLimitOffset::GetOpNameStr
/
/ @doc:
/ Operator name
/
/---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarLimitOffset::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenScalarLimitOffset);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarLimitOffset::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLScalarLimitOffset::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const
{
const CWStringConst *element_name = GetOpNameStr();
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
node->SerializeChildrenToDXL(xml_serializer);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
#ifdef GPOS_DEBUG
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarLimitOffset::AssertValid
/
/ @doc:
/ Checks whether operator node is well-structured
/
/---------------------------------------------------------------------------
void
CDXLScalarLimitOffset::AssertValid(const CDXLNode *node,
BOOL validate_children) const
{
const ULONG arity = node->Arity();
GPOS_ASSERT(1 >= arity);
for (ULONG ul = 0; ul < arity; ++ul)
{
CDXLNode *dxlnode_arg = (*node)[ul];
GPOS_ASSERT(EdxloptypeScalar ==
dxlnode_arg->GetOperator()->GetDXLOperatorType());
if (validate_children)
{
dxlnode_arg->GetOperator()->AssertValid(dxlnode_arg,
validate_children);
}
}
}
#endif / GPOS_DEBUG
/ EOF
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