greenplumn CParseHandlerPhysicalTVF 源码

greenplumn CParseHandlerPhysicalTVF 代码

文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerPhysicalTVF.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerPhysicalTVF.cpp
//
//	@doc:
//
//		Implementation of the SAX parse handler class for parsing table-valued
//		functions
//---------------------------------------------------------------------------

#include "naucrates/dxl/parser/CParseHandlerPhysicalTVF.h"

#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLPhysicalTVF.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerPhysicalOp.h"
#include "naucrates/dxl/parser/CParseHandlerProjList.h"
#include "naucrates/dxl/parser/CParseHandlerProperties.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerUtils.h"

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerPhysicalTVF::CParseHandlerPhysicalTVF
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerPhysicalTVF::CParseHandlerPhysicalTVF(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root),
	  m_func_mdid(nullptr),
	  m_return_type_mdid(nullptr),
	  m_pstr(nullptr)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerPhysicalTVF::StartElement
//
//	@doc:
//		Processes a Xerces start element event
//
//---------------------------------------------------------------------------
void
CParseHandlerPhysicalTVF::StartElement(const XMLCh *const element_uri,
									   const XMLCh *const element_local_name,
									   const XMLCh *const element_qname,
									   const Attributes &attrs)
{
	if (0 ==
		XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenPhysicalTVF),
								 element_local_name))
	{
		// parse function id
		m_func_mdid = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenFuncId,
			EdxltokenPhysicalTVF);

		// parse function name
		const XMLCh *xml_str_func_name = CDXLOperatorFactory::ExtractAttrValue(
			attrs, EdxltokenName, EdxltokenPhysicalTVF);

		CWStringDynamic *str_func_name =
			CDXLUtils::CreateDynamicStringFromXMLChArray(
				m_parse_handler_mgr->GetDXLMemoryManager(), xml_str_func_name);
		m_pstr = GPOS_NEW(m_mp) CWStringConst(m_mp, str_func_name->GetBuffer());
		GPOS_DELETE(str_func_name);

		// parse return type
		m_return_type_mdid = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenTypeId,
			EdxltokenPhysicalTVF);

		// parse handler for the proj list
		CParseHandlerBase *proj_list_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarProjList),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(proj_list_parse_handler);

		//parse handler for the properties of the operator
		CParseHandlerBase *prop_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenProperties),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(prop_parse_handler);

		// store parse handlers
		this->Append(prop_parse_handler);
		this->Append(proj_list_parse_handler);
	}
	else
	{
		// parse scalar child
		CParseHandlerBase *child_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);

		// store parse handler
		this->Append(child_parse_handler);

		child_parse_handler->startElement(element_uri, element_local_name,
										  element_qname, attrs);
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerPhysicalTVF::EndElement
//
//	@doc:
//		Processes a Xerces end element event
//
//---------------------------------------------------------------------------
void
CParseHandlerPhysicalTVF::EndElement(const XMLCh *const,  // element_uri,
									 const XMLCh *const element_local_name,
									 const XMLCh *const	 // element_qname
)
{
	if (0 !=
		XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenPhysicalTVF),
								 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	CDXLPhysicalTVF *dxl_op = GPOS_NEW(m_mp)
		CDXLPhysicalTVF(m_mp, m_func_mdid, m_return_type_mdid, m_pstr);
	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);

	CParseHandlerProperties *prop_parse_handler =
		dynamic_cast<CParseHandlerProperties *>((*this)[0]);

	// set statistics and physical properties
	CParseHandlerUtils::SetProperties(m_dxl_node, prop_parse_handler);

	CParseHandlerProjList *proj_list_parse_handler =
		dynamic_cast<CParseHandlerProjList *>((*this)[1]);
	AddChildFromParseHandler(proj_list_parse_handler);

	const ULONG size = this->Length();
	for (ULONG ul = 2; ul < size; ul++)
	{
		CParseHandlerScalarOp *child_parse_handler =
			dynamic_cast<CParseHandlerScalarOp *>((*this)[ul]);
		AddChildFromParseHandler(child_parse_handler);
	}

	// deactivate handler
	m_parse_handler_mgr->DeactivateHandler();
}

// EOF

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