greenplumn CParseHandlerDynamicTableScan 源码

greenplumn CParseHandlerDynamicTableScan 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerDynamicTableScan.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing dynamic
//		table scan operators
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLPhysicalDynamicTableScan.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFilter.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataIdList.h"
#include "naucrates/dxl/parser/CParseHandlerProjList.h"
#include "naucrates/dxl/parser/CParseHandlerProperties.h"
#include "naucrates/dxl/parser/CParseHandlerTableDescr.h"
#include "naucrates/dxl/parser/CParseHandlerUtils.h"

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerDynamicTableScan::CParseHandlerDynamicTableScan
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CParseHandlerDynamicTableScan::CParseHandlerDynamicTableScan(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root)
{
}


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerDynamicTableScan::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerDynamicTableScan::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(EdxltokenPhysicalDynamicTableScan),
				 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	m_selector_ids = CDXLOperatorFactory::ExtractConvertValuesToArray(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenSelectorIds,
		EdxltokenPhysicalDynamicTableScan);

	// create child node parsers in reverse order of their expected occurrence

	// parse handler for table descriptor
	CParseHandlerBase *table_descr_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenTableDescr),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(table_descr_parse_handler);

	CParseHandlerBase *partition_mdids_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenMetadataIdList),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(partition_mdids_parse_handler);


	// parse handler for the filter
	CParseHandlerBase *filter_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarFilter),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(filter_parse_handler);

	// 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 child parse handlers in array
	this->Append(prop_parse_handler);
	this->Append(proj_list_parse_handler);
	this->Append(filter_parse_handler);
	this->Append(partition_mdids_parse_handler);
	this->Append(table_descr_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerDynamicTableScan::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerDynamicTableScan::EndElement(const XMLCh *const,  // element_uri,
										  const XMLCh *const element_local_name,
										  const XMLCh *const  // element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenPhysicalDynamicTableScan),
				 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	// construct node from the created child nodes
	CParseHandlerProperties *prop_parse_handler =
		dynamic_cast<CParseHandlerProperties *>((*this)[0]);
	CParseHandlerProjList *proj_list_parse_handler =
		dynamic_cast<CParseHandlerProjList *>((*this)[1]);
	CParseHandlerFilter *filter_parse_handler =
		dynamic_cast<CParseHandlerFilter *>((*this)[2]);
	CParseHandlerMetadataIdList *partition_mdids_parse_handler =
		dynamic_cast<CParseHandlerMetadataIdList *>((*this)[3]);
	CParseHandlerTableDescr *table_descr_parse_handler =
		dynamic_cast<CParseHandlerTableDescr *>((*this)[4]);


	// set table descriptor
	CDXLTableDescr *table_descr = table_descr_parse_handler->GetDXLTableDescr();
	table_descr->AddRef();

	IMdIdArray *mdid_partitions_array =
		partition_mdids_parse_handler->GetMdIdArray();
	mdid_partitions_array->AddRef();
	CDXLPhysicalDynamicTableScan *dxl_op =
		GPOS_NEW(m_mp) CDXLPhysicalDynamicTableScan(
			m_mp, table_descr, mdid_partitions_array, m_selector_ids);

	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
	// set statictics and physical properties
	CParseHandlerUtils::SetProperties(m_dxl_node, prop_parse_handler);

	// add constructed children
	AddChildFromParseHandler(proj_list_parse_handler);
	AddChildFromParseHandler(filter_parse_handler);

#ifdef GPOS_DEBUG
	dxl_op->AssertValid(m_dxl_node, false /* validate_children */);
#endif	// GPOS_DEBUG

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

// EOF

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