greenplumn CParseHandlerAgg 源码

greenplumn CParseHandlerAgg 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2010 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerAgg.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing aggregate operators.
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFilter.h"
#include "naucrates/dxl/parser/CParseHandlerGroupingColList.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:
//		CParseHandlerAgg::CParseHandlerAgg
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CParseHandlerAgg::CParseHandlerAgg(CMemoryPool *mp,
								   CParseHandlerManager *parse_handler_mgr,
								   CParseHandlerBase *parse_handler_root)
	: CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_op(nullptr)
{
}


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

	// parse and create group by operator
	m_dxl_op = (CDXLPhysicalAgg *) CDXLOperatorFactory::MakeDXLAgg(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs);

	// create and activate the parse handler for the children nodes in reverse
	// order of their expected appearance

	// parse handler for child node
	CParseHandlerBase *child_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenPhysical),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(child_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 grouping columns list
	CParseHandlerBase *grouping_col_list_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarGroupingColList),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(grouping_col_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(grouping_col_list_parse_handler);
	this->Append(proj_list_parse_handler);
	this->Append(filter_parse_handler);
	this->Append(child_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerAgg::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerAgg::EndElement(const XMLCh *const,  // element_uri,
							 const XMLCh *const element_local_name,
							 const XMLCh *const	 // element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenPhysicalAggregate),
				 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

	GPOS_ASSERT(5 == this->Length());

	CParseHandlerProperties *prop_parse_handler =
		dynamic_cast<CParseHandlerProperties *>((*this)[0]);
	CParseHandlerGroupingColList *grouping_col_list_parse_handler =
		dynamic_cast<CParseHandlerGroupingColList *>((*this)[1]);
	CParseHandlerProjList *proj_list_parse_handler =
		dynamic_cast<CParseHandlerProjList *>((*this)[2]);
	CParseHandlerFilter *filter_parse_handler =
		dynamic_cast<CParseHandlerFilter *>((*this)[3]);
	CParseHandlerPhysicalOp *child_parse_handler =
		dynamic_cast<CParseHandlerPhysicalOp *>((*this)[4]);

	// set grouping cols list
	GPOS_ASSERT(nullptr !=
				grouping_col_list_parse_handler->GetGroupingColidArray());

	ULongPtrArray *grouping_colid_array =
		grouping_col_list_parse_handler->GetGroupingColidArray();
	grouping_colid_array->AddRef();
	m_dxl_op->SetGroupingCols(grouping_colid_array);

	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, m_dxl_op);

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

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

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

// EOF

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