greenplumn CDXLPhysicalTableScan 源码

greenplumn CDXLPhysicalTableScan 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2010 Greenplum, Inc.
//
//	@filename:
//		CDXLPhysicalTableScan.cpp
//
//	@doc:
//		Implementation of DXL physical table scan operators
//---------------------------------------------------------------------------


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

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

using namespace gpos;
using namespace gpdxl;

//---------------------------------------------------------------------------
//	@function:
//		CDXLPhysicalTableScan::CDXLPhysicalTableScan
//
//	@doc:
//		Construct a table scan node with uninitialized table descriptor
//
//---------------------------------------------------------------------------
CDXLPhysicalTableScan::CDXLPhysicalTableScan(CMemoryPool *mp)
	: CDXLPhysical(mp), m_dxl_table_descr(nullptr)
{
}


//---------------------------------------------------------------------------
//	@function:
//		CDXLPhysicalTableScan::CDXLPhysicalTableScan
//
//	@doc:
//		Construct a table scan node given its table descriptor
//
//---------------------------------------------------------------------------
CDXLPhysicalTableScan::CDXLPhysicalTableScan(CMemoryPool *mp,
											 CDXLTableDescr *table_descr)
	: CDXLPhysical(mp), m_dxl_table_descr(table_descr)
{
}


//---------------------------------------------------------------------------
//	@function:
//		CDXLPhysicalTableScan::~CDXLPhysicalTableScan
//
//	@doc:
//		Destructor
//
//---------------------------------------------------------------------------
CDXLPhysicalTableScan::~CDXLPhysicalTableScan()
{
	CRefCount::SafeRelease(m_dxl_table_descr);
}


//---------------------------------------------------------------------------
//	@function:
//		CDXLPhysicalTableScan::SetTableDescriptor
//
//	@doc:
//		Set table descriptor
//
//---------------------------------------------------------------------------
void
CDXLPhysicalTableScan::SetTableDescriptor(CDXLTableDescr *table_descr)
{
	// allow setting table descriptor only once
	GPOS_ASSERT(nullptr == m_dxl_table_descr);

	m_dxl_table_descr = table_descr;
}

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


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

//---------------------------------------------------------------------------
//	@function:
//		CDXLPhysicalTableScan::GetDXLTableDescr
//
//	@doc:
//		Table descriptor for the table scan
//
//---------------------------------------------------------------------------
const CDXLTableDescr *
CDXLPhysicalTableScan::GetDXLTableDescr()
{
	return m_dxl_table_descr;
}


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

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

	// serialize properties
	dxlnode->SerializePropertiesToDXL(xml_serializer);

	// serialize children
	dxlnode->SerializeChildrenToDXL(xml_serializer);

	// serialize table descriptor
	m_dxl_table_descr->SerializeToDXL(xml_serializer);

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

#ifdef GPOS_DEBUG
//---------------------------------------------------------------------------
//	@function:
//		CDXLPhysicalTableScan::AssertValid
//
//	@doc:
//		Checks whether operator node is well-structured
//
//---------------------------------------------------------------------------
void
CDXLPhysicalTableScan::AssertValid(const CDXLNode *dxlnode,
								   BOOL validate_children) const
{
	// assert proj list and filter are valid
	CDXLPhysical::AssertValid(dxlnode, validate_children);

	// table scan has only 2 children
	GPOS_ASSERT(2 == dxlnode->Arity());

	// assert validity of table descriptor
	GPOS_ASSERT(nullptr != m_dxl_table_descr);
	GPOS_ASSERT(nullptr != m_dxl_table_descr->MdName());
	GPOS_ASSERT(m_dxl_table_descr->MdName()->GetMDName()->IsValid());
}
#endif	// GPOS_DEBUG

// EOF

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