greenplumn CDXLScalarSwitchCase 源码

greenplumn CDXLScalarSwitchCase 代码

文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarSwitchCase.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CDXLScalarSwitchCase.cpp
//
//	@doc:
//		Implementation of DXL Switch case
//---------------------------------------------------------------------------

#include "naucrates/dxl/operators/CDXLScalarSwitchCase.h"

#include "gpopt/mdcache/CMDAccessor.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"

using namespace gpopt;
using namespace gpos;
using namespace gpdxl;

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarSwitchCase::CDXLScalarSwitchCase
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CDXLScalarSwitchCase::CDXLScalarSwitchCase(CMemoryPool *mp) : CDXLScalar(mp)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarSwitchCase::GetDXLOperator
//
//	@doc:
//		Operator type
//
//---------------------------------------------------------------------------
Edxlopid
CDXLScalarSwitchCase::GetDXLOperator() const
{
	return EdxlopScalarSwitchCase;
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarSwitchCase::GetOpNameStr
//
//	@doc:
//		Operator name
//
//---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarSwitchCase::GetOpNameStr() const
{
	return CDXLTokens::GetDXLTokenStr(EdxltokenScalarSwitchCase);
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarSwitchCase::SerializeToDXL
//
//	@doc:
//		Serialize operator in DXL format
//
//---------------------------------------------------------------------------
void
CDXLScalarSwitchCase::SerializeToDXL(CXMLSerializer *xml_serializer,
									 const CDXLNode *dxlnode) const
{
	const CWStringConst *element_name = GetOpNameStr();

	xml_serializer->OpenElement(
		CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
	dxlnode->SerializeChildrenToDXL(xml_serializer);
	xml_serializer->CloseElement(
		CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}

#ifdef GPOS_DEBUG
//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarSwitchCase::AssertValid
//
//	@doc:
//		Checks whether operator node is well-structured
//
//---------------------------------------------------------------------------
void
CDXLScalarSwitchCase::AssertValid(const CDXLNode *dxlnode,
								  BOOL validate_children) const
{
	const ULONG arity = dxlnode->Arity();
	GPOS_ASSERT(2 == arity);

	for (ULONG idx = 0; idx < arity; ++idx)
	{
		CDXLNode *dxlnode_arg = (*dxlnode)[idx];
		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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