greenplumn CParseHandlerIndexScan 源码

greenplumn CParseHandlerIndexScan 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerIndexScan.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for the index scan operator
//
//	@owner:
//
//
//	@test:
//
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLPhysicalDynamicIndexScan.h"
#include "naucrates/dxl/operators/CDXLPhysicalIndexOnlyScan.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFilter.h"
#include "naucrates/dxl/parser/CParseHandlerIndexCondList.h"
#include "naucrates/dxl/parser/CParseHandlerIndexDescr.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataIdList.h"
#include "naucrates/dxl/parser/CParseHandlerProjList.h"
#include "naucrates/dxl/parser/CParseHandlerProperties.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerTableDescr.h"
#include "naucrates/dxl/parser/CParseHandlerUtils.h"

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerIndexScan::CParseHandlerIndexScan
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerIndexScan::CParseHandlerIndexScan(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root),
	  m_index_scan_dir(EdxlisdSentinel)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerIndexScan::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerIndexScan::StartElement(const XMLCh *const,  // element_uri,
									 const XMLCh *const element_local_name,
									 const XMLCh *const,  // element_qname
									 const Attributes &attrs)
{
	StartElementHelper(element_local_name, attrs, EdxltokenPhysicalIndexScan);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerIndexScan::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerIndexScan::EndElement(const XMLCh *const,	// element_uri,
								   const XMLCh *const element_local_name,
								   const XMLCh *const  // element_qname
)
{
	EndElementHelper(element_local_name, EdxltokenPhysicalIndexScan);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerIndexScan::StartElementHelper
//
//	@doc:
//		Common StartElement functionality for IndexScan and IndexOnlyScan
//
//---------------------------------------------------------------------------
void
CParseHandlerIndexScan::StartElementHelper(
	const XMLCh *const element_local_name, const Attributes &attrs,
	Edxltoken token_type)
{
	if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(token_type),
									  element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	// get the index scan direction from the attribute
	const XMLCh *index_scan_direction = CDXLOperatorFactory::ExtractAttrValue(
		attrs, EdxltokenIndexScanDirection, token_type);
	m_index_scan_dir = CDXLOperatorFactory::ParseIndexScanDirection(
		index_scan_direction, CDXLTokens::GetDXLTokenStr(token_type));
	GPOS_ASSERT(EdxlisdSentinel != m_index_scan_dir);

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

	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);

	// parse handler for the index descriptor
	CParseHandlerBase *index_descr_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenIndexDescr),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(index_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 index condition list
	CParseHandlerBase *index_condition_list_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarIndexCondList),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(
		index_condition_list_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 parse handlers
	this->Append(prop_parse_handler);
	this->Append(proj_list_parse_handler);
	this->Append(filter_parse_handler);
	this->Append(index_condition_list_parse_handler);
	this->Append(partition_mdids_parse_handler);
	this->Append(index_descr_parse_handler);
	this->Append(table_descr_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerIndexScan::EndElementHelper
//
//	@doc:
//		Common EndElement functionality for IndexScan and IndexOnlyScan
//
//---------------------------------------------------------------------------
void
CParseHandlerIndexScan::EndElementHelper(const XMLCh *const element_local_name,
										 Edxltoken token_type,
										 ULongPtrArray *selector_ids)
{
	if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(token_type),
									  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]);
	CParseHandlerIndexCondList *index_condition_list_parse_handler =
		dynamic_cast<CParseHandlerIndexCondList *>((*this)[3]);
	CParseHandlerMetadataIdList *partition_mdids_parse_handler =
		dynamic_cast<CParseHandlerMetadataIdList *>((*this)[4]);
	CParseHandlerIndexDescr *index_descr_parse_handler =
		dynamic_cast<CParseHandlerIndexDescr *>((*this)[5]);
	CParseHandlerTableDescr *table_descr_parse_handler =
		dynamic_cast<CParseHandlerTableDescr *>((*this)[6]);

	CDXLTableDescr *dxl_table_descr =
		table_descr_parse_handler->GetDXLTableDescr();
	dxl_table_descr->AddRef();

	CDXLIndexDescr *dxl_index_descr =
		index_descr_parse_handler->GetDXLIndexDescr();
	dxl_index_descr->AddRef();

	CDXLPhysical *dxl_op = nullptr;
	if (EdxltokenPhysicalIndexOnlyScan == token_type)
	{
		dxl_op = GPOS_NEW(m_mp) CDXLPhysicalIndexOnlyScan(
			m_mp, dxl_table_descr, dxl_index_descr, m_index_scan_dir);
		m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
	}
	else if (EdxltokenPhysicalIndexScan == token_type)
	{
		dxl_op = GPOS_NEW(m_mp) CDXLPhysicalIndexScan(
			m_mp, dxl_table_descr, dxl_index_descr, m_index_scan_dir);
		m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
	}
	else
	{
		GPOS_ASSERT(EdxltokenPhysicalDynamicIndexScan == token_type);

		IMdIdArray *mdid_partitions_array =
			partition_mdids_parse_handler->GetMdIdArray();
		mdid_partitions_array->AddRef();
		dxl_op = GPOS_NEW(m_mp) CDXLPhysicalDynamicIndexScan(
			m_mp, dxl_table_descr, dxl_index_descr, m_index_scan_dir,
			mdid_partitions_array, selector_ids);
		m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
	}

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

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

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

// EOF

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