greenplumn CDXLLogicalGet 源码

greenplumn CDXLLogicalGet 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 Greenplum, Inc.
//
//	@filename:
//		CDXLLogicalGet.cpp
//
//	@doc:
//		Implementation of DXL logical get operator
//
//---------------------------------------------------------------------------

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

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

using namespace gpos;
using namespace gpdxl;

//---------------------------------------------------------------------------
//	@function:
//		CDXLLogicalGet::CDXLLogicalGet
//
//	@doc:
//		Construct a logical get operator node given its table descriptor rtable entry
//
//---------------------------------------------------------------------------
CDXLLogicalGet::CDXLLogicalGet(CMemoryPool *mp, CDXLTableDescr *table_descr)
	: CDXLLogical(mp), m_dxl_table_descr(table_descr)
{
}

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

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

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

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


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

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

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

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

//---------------------------------------------------------------------------
//	@function:
//		CDXLLogicalGet::IsColDefined
//
//	@doc:
//		Check if given column is defined by operator
//
//---------------------------------------------------------------------------
BOOL
CDXLLogicalGet::IsColDefined(ULONG colid) const
{
	const ULONG size = m_dxl_table_descr->Arity();
	for (ULONG descr_id = 0; descr_id < size; descr_id++)
	{
		ULONG id = m_dxl_table_descr->GetColumnDescrAt(descr_id)->Id();
		if (id == colid)
		{
			return true;
		}
	}

	return false;
}

#ifdef GPOS_DEBUG
//---------------------------------------------------------------------------
//	@function:
//		CDXLLogicalGet::AssertValid
//
//	@doc:
//		Checks whether operator node is well-structured
//
//---------------------------------------------------------------------------
void
CDXLLogicalGet::AssertValid(const CDXLNode *,  //dxlnode
							BOOL			   // validate_children
) const
{
	// 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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