greenplumn CDXLScalarLimitCount 源码

greenplumn CDXLScalarLimitCount 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 Greenplum, Inc.
//
//	@filename:
//		CDXLScalarLimitCount.cpp
//
//	@doc:
//		Implementation of DXL Scalar Limit Count
//
//---------------------------------------------------------------------------

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

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

using namespace gpos;
using namespace gpdxl;

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarLimitCount::CDXLScalarLimitCount
//
//	@doc:
//		Constructs a scalar Limit Count node
//
//---------------------------------------------------------------------------
CDXLScalarLimitCount::CDXLScalarLimitCount(CMemoryPool *mp) : CDXLScalar(mp)
{
}


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


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

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarLimitCount::SerializeToDXL
//
//	@doc:
//		Serialize operator in DXL format
//
//---------------------------------------------------------------------------
void
CDXLScalarLimitCount::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:
//		CDXLScalarLimitCount::AssertValid
//
//	@doc:
//		Checks whether operator node is well-structured
//
//---------------------------------------------------------------------------
void
CDXLScalarLimitCount::AssertValid(const CDXLNode *node,
								  BOOL validate_children) const
{
	const ULONG arity = node->Arity();
	GPOS_ASSERT(1 >= arity);

	for (ULONG idx = 0; idx < arity; ++idx)
	{
		CDXLNode *dxlnode_arg = (*node)[idx];
		GPOS_ASSERT(EdxloptypeScalar ==
					dxlnode_arg->GetOperator()->GetDXLOperatorType());

		if (validate_children)
		{
			dxlnode_arg->GetOperator()->AssertValid(dxlnode_arg,
													validate_children);
		}
	}
}
#endif	// GPOS_DEBUG

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CDXLColDescr 源码

greenplumn CDXLColRef 源码

greenplumn CDXLCtasStorageOptions 源码

greenplumn CDXLDatum 源码

greenplumn CDXLDatumBool 源码

greenplumn CDXLDatumGeneric 源码

greenplumn CDXLDatumInt2 源码

greenplumn CDXLDatumInt4 源码

greenplumn CDXLDatumInt8 源码

greenplumn CDXLDatumOid 源码