greenplumn CDXLScalarDMLAction 源码

greenplumn CDXLScalarDMLAction 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CDXLScalarDMLAction.cpp
//
//	@doc:
//		Implementation of DXL DML action expression
//---------------------------------------------------------------------------

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

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

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

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarDMLAction::CDXLScalarDMLAction
//
//	@doc:
//		Constructs an action expression
//
//---------------------------------------------------------------------------
CDXLScalarDMLAction::CDXLScalarDMLAction(CMemoryPool *mp) : CDXLScalar(mp)
{
}


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


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


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

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

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarDMLAction::HasBoolResult
//
//	@doc:
//		Does the operator return a boolean result
//
//---------------------------------------------------------------------------
BOOL
CDXLScalarDMLAction::HasBoolResult(CMDAccessor *  // md_accessor
) const
{
	return false;
}

#ifdef GPOS_DEBUG
//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarDMLAction::AssertValid
//
//	@doc:
//		Checks whether operator node is well-structured
//
//---------------------------------------------------------------------------
void
CDXLScalarDMLAction::AssertValid(const CDXLNode *node,
								 BOOL  // validate_children
) const
{
	GPOS_ASSERT(0 == node->Arity());
}
#endif	// GPOS_DEBUG

// EOF

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